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Control Fins on Bow of SWATH

Figure 3-1: Control Fins on Bow of SWATH

Control Fins on Bow of SWATH

Smooth Sailing: Pros and Cons of a SWATH Vessel

Welcome to luxury cruising.  Glide above the waves without any jerky motions.  Walk about your accommodation deck, unhampered by nasty rolling motions.  If this temps you, come realize the dream of the SWATH vessel.  But it comes at a price.  Discover if this unique vessel is right for you.

1.0 What is a SWATH?

SWATH stands for Small Waterplane Area Twin Hull.  Naval architects searched for a way to minimize the seakeeping motions of a catamaran.  They liked the large deck area, but those pesky waves were a problem, bouncing the ship around.  The designers noticed that the forces from those waves depended on the width of the hulls.  More specifically, the waterplane area. (Figure 1‑1)

Waterplane area

The designers shrunk the waterplane area until it was a small strut, just wide enough to fit a crew member down.  All the buoyancy got concentrated into deep submerged hulls, which looked more like a submarine hull.  And the SWATH was born:  a vessel with excellent seakeeping because waves exert very little force on it. (Figure 1‑2)  The force of the waves depends mainly on the waterplane area.  Small waterplane meant small wave actions.

2.0 Advantages

SWATHS are specialized ships with one major goal:  excellent seakeeping capability.  SWATH ships have the same massive deck area of a catamaran, with far superior seakeeping capabilities.  In Figure 2‑1, compare the motions of the monohull in the foreground to the SWATH in the background.

Figure 2‑1:  Comparison Between SWATH and Conventional Ship

These reduced ship motions are a major benefit to the crew.  In the cases of research ships, the crew may not be seasoned seafarers.  They get seasick easily; so reduced ship motions help improve crew productivity.  Even experienced seafarers appreciate the smooth gliding motion of a SWATH vessel. No more rocking around.  Just gentle swells as the ship gradually rises and slides along the waves.

When comparing a SWATH to your current monohull, be sure to clearly identify the type of motion that bothers you.  If you feel the ship jerking from side to side and knocking you around, a SWATH may not be the best option.  The side to side jerking comes from roll accelerations, which is just one small part of the total ship motions.  We have retrofit options to reduce the roll accelerations, and these retrofits are far less expensive than a new SWATH.  On the other hand, if you are more concerned about total ship motions or see a lot of pitch motion, then a SWATH is probably the best way to go.

3.0 Disadvantages

The excellent seakeeping of a SWATH comes at a price.  First, a SWATH may be too insensitive to the waves.  Imagine that.  The wave crest swells up, rising higher and higher, but the SWATH does nothing.  That is, until the wave slams into the underside of your cross deck.  Then you get woken to a jarring bang followed by violet pitch motions.

To avoid waves hitting the cross deck, SWATH ships are often equipped with active or passive control fins.  These are small underwater versions of airplane wings. (Figure 3‑1)  They help the ship react to the oncoming waves and make sure the vessel still tracks along the larger swells.

Control Fins on Bow of SWATH

Passive control fins are not a major cost.  They are the equivalent of adding a skeg to the vessel.  But active control fins require hydraulic machinery, motion sensors, and a control unit.  That makes a big price tag.  But all that machinery contributes to the magical smooth ride that a SWATH delivers.

SWATHS are also extremely weight sensitive.  With such slender hulls, SWATH ships sink down quickly as you add a few extra tonnes.  Looking at Figure 3‑1, you notice that the SWATH maintains a large air gap between the waterline and the cross deck.  The waves wash harmlessly in this air gap.  That is how it should work, unless you put too much weight on the ship.  Discipline over your deadweight is key.  The engineer can’t store 15 spare filters onboard.  Too much weight.  Any ship spares quickly reduce your mission weight capacity.  SWATH ships show minimal flexibility in their cargo capacity.

Speaking of weight, you will need to arrange the major ship machinery differently.  Those submerged hulls rarely have enough space for a full engine room.  The main engines typically get mounted on the main deck, which is great for maintenance.  But they require complex shafting or a diesel-electric arrangement to deliver that power to the propellers in the hull.  Not all of your main deck space goes to the mission.  Many of the spaces typically found in the lower decks now occupy your mission deck.  Arrangements on a SWATH get creative.

4.0 Applications

The seakeeping advantages of a SWATH make it valuable to many owners, despite the design challenges.  Common applications for SWATH include:

  • Research vessels
  • Pilot vessels / crew transport
  • Semi-submersible drill ships

Research vessels are some of the most frequent SWATH subscribers.  A boat full of scientists and grad students who rarely frequent the sea.  They will thank you for the days without seasickness.  But even better, they love you when the weather gets bad and you can remain on station; continue the mission.  Due to their reduced motions, SWATH ships remain effective at higher sea states.

The stable ship and wide cross deck make SWATH ships perfect as a launching and support platform.  Plenty of deck space to mount new scientific equipment.  And a very reliable platform to deploy instruments into the sea.  SWATH ships are great for subsea operations and survey vessels.

SWATH Research Ship

Land lubbers aren’t the only ones who love a smooth ride.  Many pilot boats also enjoy a SWATH.  You find great reassurance in the safety of the stable platform before jumping over to the inbound freighter.  And the improved ride allows the SWATH to drive much faster.  Arrive at your freighter in short time, unfatigued from the ride.

Don’t assume that the SWATH hull only works for small ships.  Some of the largest SWATH vessels are used in the offshore oil industry, called semi-submersibles. (Figure 4‑2)  These huge ships can travel out to a drill site and ballast down with their lower hulls fully submerged.  Just four columns breach the water to connect with the cross deck.  The SWATH hullform creates a nearly motionless platform that allows excellent working conditions as they drill the wells.  Combined with dynamic positioning technology, the SWATH turns a semi-submersible into a movable piece of land.  These giants carry hundreds of tonnes in drill pipe, drilling mud, and related machinery.  They stand as testament that the SWATH ship is no child’s toy.

MASSIVE Semi-Submersible SWATH

5.0 Conclusion

When you think about SWATH ships, remember seakeeping.  Imagine gliding gently over waves, placidly sipping your tea.  While the nearby monohull bounces around like a cork.  That serenity is what SWATH ships deliver.  It comes at the price of several new design challenges.  But for the right mission, a SWATH is worth it.

6.0 References

Related posts.

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Figure 3-1: Icebreaker Healy [4]

Surviving the Arctic: Polar Class Icebreakers

Icebreaker Mackinaw in Sea Ice

Figure 2-1: Icebreaker Mackinaw in Sea Ice [3]

Ramming the Ice: Icebreaker Propulsion

swath catamaran

How to Design a Ship

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Stability Letters Explained

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Small waterplane area twin hull (SWATH)

In 1999, the German pilots started to work with two 25m SWATH pilot tenders, followed by a 50m SWATH pilot station ship ELBE built in 2000 by the German shipyard Abeking & Rasmussen. Both the station ship and the pilot tenders have excellent seakeeping performance and manoeuvring capabilities. During adverse weather conditions, the pilot transfer service can continue even at a waveheight of 3.5m (wind force 10-11). See also SWATH research vessel PLANET .  Useful website:  www.abeking.com

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Marine Insight

What is a SWATH Ship?

A SWATH ship is the abbreviated form of the word ‘Small Waterplane Area Twin Hull’ ship. Swath ships are designed in such a way that they have two or dual hulls instead of the conventional single hull. Technically, a swath ship is a type of a catamaran.

The two hulls of the swath ship are built so as to offer the maximum amount of balance or buoyancy to the ship. The placement of the hull is such that it rests under the water surface, making it safer and easier for the ship to sail when high tides and fast currents hit with full force. Whereas in single hull ships or boats, the hull floats above the surface of the water which makes the sailing difficult especially during unpredictable and rough seas.

The position of the hull under the surface of the water is also sometimes referred to being ‘submarine submerged’ as the technology looks similar to a submarine moving under the water. Along with the factor of buoyancy, a swath vessel is also known for its speed.  Another feature and advantage of a swath vessel over the traditional ships is that it offers a bigger and wider area than the conventional types of ships .

SWATH Ship

Swath ships are used as both – cruise as well as cargo ships and are also used as army and research vessels. The swath ship was first created by Fredrick G. Creed, a Canadian, in the year 1938. The patent for the same was obtained in the year 1946 in Great Britain. The vessel, however, was utilised for the first time in the shipping industry only in the 60s and 70s.The first swath ship was used as a research vehicle than as a transporting vessel across the water.

Some of the swath ships that are in operation today include the Cloud X which acts as a ferry between the Bahamas and Florida and the USNS Impeccable – a US marine surveillance vessel.

One of the main disadvantages of swath ships is that the two hull build of the ship makes it far more power and energy consuming than the single hull variety ships. Because of this, another disadvantage of the ship also appears regarding the overall expenditure involved in the construction and energy supply of the swath ships. The energy required to be spent on a swath vessel is eight times or 80% more than the energy spent on a ship with a single hull.

In their own way, swath ships have revolutionised water transport. In spite of their faults, they have been a very unique presence and will continue to do so in the days to come.

If you liked this you may also like Stealth ship & Expedition ship.

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swath catamaran

SILVER CLOUD Specifications

Abeking & rasmussen silver cloud for sale.

Silver Cloud is a 134’6″ SWATH Yacht built by Abeking & Rasmussen in Germany. SWATH stands for Small Waterplane Area Twin Hull. The outstanding feature is smooth sailing in rough seas. A&R has perfected this design by building numerous SWATH ships for pilot service in the North Sea, an area known for very rough conditions. The 80′ SWATH pilot boats can safely put pilots on and off ships in seas to 20 feet.

The first SWATH yacht was designed and built for a trailblazing, experienced yachtsman so he could take his family and friends around the world in complete comfort and without the effect of seasickness. Silver Cloud has been around the world twice with owners and guests aboard for all open water crossings including transpacific and transatlantic. Silver Cloud was awarded the Technology Award at the prestigious World Superyacht Awards in 2009

The stability of this vessel is truly exceptional and you can view a video of a SWATH ship along side a much larger vessel in rough seas by visiting the web site www.yachtsilvercloud.com. Also, this web site will give you details and photographs of Silver Cloud from conception to completing her world cruises.

Silver Cloud has recently completed her DNV/GL inspection including the rebuild of her main engines and is ready for many more years of outstanding adventures to interesting places most yachts do not venture. 

Silver Cloud is currently in a Foreign Trade Zone (FTZ).

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Cape Horn Engineering

SWATH (Small Waterplane Area Twin Hull)

swath catamaran

Cape Horn Engineering have proudly worked with Naiad Dynamics, ship motion control experts, on the CFD design optimisation for the stabilisation fins to improve the longitudinal stability of the Service Operation Vessel (SOV).

Recently launched at the CEMRE shipyard in Turkey, ‘Groene Wind’ is chartered to Siemens Gamesa Renewable Energy for the maintenance of offshore wind farms in Belgium. This is the first DP2, twin-hulled SOV in the world and the first to serve three different wind farm sites. The SWATH provides a stable platform and large, broad decks for offshore crew activities services. The new vessel significantly improves safety, comfort and workability for wind farm technicians – even in the roughest sea conditions.

swath catamaran

HULL DESIGN

The 60m twin-hull ship is designed to minimise the hull cross section area at the sea’s surface. The greatest benefit of this is that the waves have much less of an effect on the vessel, so it does not react as much to a heavy sea state. This improved seakeeping characteristics of the SWATH concept means there is a much more stable platform compared to a traditional monohull SOV, useful when approaching wind turbines and for safe crew transfers in waves.  

The bulk of the displacement is located beneath the waves, where it is less affected by wave action. The design of SWATH is considerably more complex due to the structural complexities inherent to the design. With high surface drag, yet low wave drag, the SWATH is less susceptible to wave motion, but more sensitive to payload, which affects the pitch and the draught.

FUEL EFFICIENCY

The vessels second generation Dynamic Positioning (DP2) technology means that the vessel can hold its position in rough seas but at the same time operate with lower fuel consumption when compared to traditional SOVs. An impressive fuel consumption reduction of up to 50% can be achieved compared to a monohull SOV, further reducing the cost of wind farm maintenance. In line with her green credentials, environmental considerations are integral to the vessel design and include a waste heat recovery system and a Clean Design notation.

CFD Analysis

SWATH vessels are known for their inherent low longitudinal stability. They have the tendency of trimming bow down at maximum speed. To overcome this issue, the vessel was fitted with Naiad Dynamics’s stabilisation system – a pair of stabiliser fins mounted on the inner sides of both hulls, a short distance aft of the bow thrusters. The effects of the tunnels on the flow into the fins and thus the ability of them to perform properly and efficiently were a cause for concern.

CFD performance analysis were run for the whole vessel, including the rudders and fins, with the aim to achieve a better understanding of the correlation between rotating the fins, and regulating the SWATH’s trim. The analysis was performed over the range of operating speeds.

There were two main questions to be answered during the analysis of the SWATH; Firstly, are the installed fins capable of maintaining level trim while sailing at maximum speed, Secondly, which angle attacks give neutral lift for a range of boat speeds.

swath catamaran

Simulation Setup

The simulations were carried out following Cape Horn Engineering’s best practices at full scale with 2 Degrees-Of-Freedom (sinkage and trim), free surface deformation, viscous and turbulent flow. We use the best in market CFD code STAR-CCM+ by Siemens PLM. The simulations are run on a High Performance Computing (HPC) cluster, the mesh used had around 5 million cells so each simulation took about XXX hours to run until converged.

swath catamaran

Results for level trim at 12 knots

One of the investigations was to determine which fin angle would allow to achieve a 0 degree trim while sailing at 12 knots of boats speed.

The first step was to run a simulation of the model using the static centre of gravity with 12 knots of boat speed and the fin at 0 degree. This simulation showed the vessel to have a trim of -2 degrees, with approximately 20 kN of downward force generated by one fin. To reduce the bow down behaviour, the fin was rotated to a positive angle of attack (AoA) to produce more upward lift. Thus an iterative process was initiated, using linear interpolation to obtain the next best guess. This process reached a value for level trim having the fin at a moderate 7.8 deg.

Results for neutral lift

In the same manner as to find the angle of attack for level trim at 12 knots, an iterative method combined with linear interpolation was used to find the fin angles that produced zero lifting force at a rate of speeds. Run speeds of 8, 10 and 12 knots were completed first, from observations of these results, a better initial guess were used for the runs of 9 and 11 knots. The previous simulations with an AoA of zero were also considered.

While processing the simulations, linear and polynomial trends were observed for the Lift and the Trim at each speed. From these, it was possible to interpolate values for a more complete dataset. The aims of these interpolations being to provide a more detailed set of values, for Naiad Dynamic to be able to set-up the control system of the fins. A useful way of presenting the results is to link Lift generated with Trim, Fin angle and Boat speed.

swath catamaran

Investigations on the effects of the bow thruster tunnels on the performance of the stabiliser fins

A simulation was run to see to what extent the bow thruster tunnel being just in front of the fin impacted its performance. It was decided that the simulation would be run at the maximum speed of 12 knots, as this is where any effect would be most noticeable. The fin was set-up at 7.8 degrees, which according to the previous analysis correspond to level trim when the tunnels are open. Several elements were observed. First of all, the behaviour of the SWATH was a lot more stable without the open tunnel. The oscillations observed for trim and lift were significantly smaller with the tunnels closed. Moreover, the lift generated was almost 30% larger, thus the fin angle that produced level trim with open tunnels now produced 4.3 degrees of bow up trim.

APPENDIX – Simulation Specifics

The CFD simulations are processed on a High Performance Computing (HPC) cluster running the latest version of the general purpose commercial code STAR-CCM+ by Siemens PLM. The code solves the Reynolds-Averaged Navier-Stokes Equations (RANSE), i.e taking into account viscosity. The k-omega SST turbulence model is applied with an all y+ treatment. An all y+ formulation switches from the traditional wall-function approach to a low Reynolds number approach with a blending function that is a function of the Reynolds number based on wall distance. The water-air interface is taken into account through the Volume Of Fluid modelling technique and the simulation is run in unsteady mode until a steady solution is reached and the forces and moments are converged to a tight tolerance of 0.1% over 200 time steps.

The CFD domain consists of a large box surrounding the vessel with the boundary conditions at least 2 or 3 boat lengths away from the vessel, so that no blockage effect is encountered. The symmetry of the simulation allows us to perform the analysis on half of the geometry to reduce computation effort.

The volume mesh has a resolution of around 5 million cells. They are composed of unstructured trimmed cells, i.e. predominantly hexahedral cells, with refinement prisms close to the body surfaces. The mesh also contains volume refinement zones. These are situated: around the fins to capture its motion relative to the hull; in the bow thruster tunnels to monitor the flow disruption in these areas and at the free surface to capture the waves generated by the SWATH around the hull and fins. These areas are where the flow gradients are the largest and a higher detailed representation of the geometry is required.

The effect of thrust of the propellers is considered in the trim attitude of the SWATH by applying a force in the direction of the propeller shaft. This force is obtained by considering its horizontal component equal to the computed drag of the vessel during the simulation. This method captures the main trim moment produced by the propulsion and is a good approximation if not enough information on the propeller is available.

Cape Horn Engineering Ltd.

Gatcombe House, Copnor Road, Portsmouth, Hampshire PO3 5EJ United Kingdom

[email protected] +44 (0)7821 717 383

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swath catamaran

The Swath 75 by Fincantieri

The term SWATH translates as Small Waterplane Area Twin Hull but to all intents and purposes, the Swath 75 is a catamaran. Fincantieri’s first, in fact. But that is not its only record. The Andrea Vallicelli-designed 75m is also the yard’s first fuel cell propulsion yacht.

swath catamaran

This particular system doesn’t recover energy it requires from a battery but from a fuel cell which produces electric energy from oxygen and hydrogen. In practical terms, the result is a top speed of 18 knots It also gives the Swath 75 zero-emissions capability, meaning it will be permitted to sail in ECA areas. Although nothing is yet known about the vessel’s range, plenty has been revealed about the design.

swath catamaran

Spread over three decks plus a fourth dedicated to the heliport, the Swath is clothed in sleek lines and boasts space aplenty: a massive 1,100 sqm of interior space and 1,800 sqm of exterior areas.

swath catamaran

It also has one of the largest beach clubs in its category which includes an enclosed lounge area and an al fresco relaxation area, a sublime infinity pool and a stern platform that lowers almost to water level. This radical yacht is aimed at farsighted owners who want to explore the Planet but are also committed to safeguarding its future. 

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SURVEY CAT 280 is a full aluminium semi-SWATH catamaran dedicated to survey and scientific missions . Based on MAURIC’s expertise in the semi-SWATH hull form design, MAURIC SURVEY CAT 280 has been designed to optimize its seakeeping and manoeuvrability performances during survey operations in coastal area. This sea-proven design, already in operation in North sea and Channel offers exceptional seakeeping and comfort at sea allowing to optimize her operability at sea for a survey vessel of her size. Her large 360deg wheelhouse, survey laboratories, strengthened aft deck, moon-pool and A-frame makes her a polyvalent multi-mission but cost-effective solution for coastal survey. Designed with a diesel-electric propulsion configuration perfectly adapted for Station-Keeping and Track-Keeping, she is able to deploy a ROV or UAVs for seabed or pipeline survey.

  • Vessel Type:             Survey Vessel
  • Loa:                            27.50 m
  • Max speed:               12 kts
  • Cruising speed:        10 kts
  • Endurance:               2400 nm @ 10 kts
  • Crew:                         5 + 9 surveyors

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SWATH vs Catamaran question

Discussion in ' Boat Design ' started by Red Dwarf , Feb 13, 2013 .

Red Dwarf

Red Dwarf Senior Member

I've been using the search function and reading about SWATH designs. Lots of good info but they seem like way too much trouble for an amateur. As far as I can tell the only thing they do well is seakeeping. In all other respects the SWATH seems to be difficult to design correctly, expensive, complicated and not much performance. I also have been looking at catamaran designs, they are well known and documented so I won't go into details. While browsing the web I came across the Stability 60 catamaran/SWATH vehicle. They claim to have the best of both worlds by using catamaran hulls on struts that can, when needed, be ballasted down to function as a SWATH. This seems way too complex for my taste. But while looking at the Stability 60 site I came across this picture which I think shows the boat in SWATH mode. Hard to tell but considering the amount of strut showing the hulls can only be inches below the surface. Note how the wave is passing under the boat. I also have attached a picture of the Stability 60 hull in catamaran mode. The design uses hulls that only stick above the water about a foot in catamaran mode. So my question is would you get some of the improved seakeeping of a SWATH, without making a SWATH, if you make a catamaran that has hulls that are very short vertically and mounted on tall struts as shown in the bottom diagram? The idea is waves under the bridgedeck height just pass over the hulls making it more like a SWATH for a short period of time as the wave passes. This would avoid the SWATH problems with excess surface area and sensitivity to weight. Basically, at rest and in smooth water it is a normal catamaran, only when a wave is large enough to engulf the pontoon will it act similar to a SWATH. I definitely see this concept using active control planes, just as a SWATH does, to control motion.  

Attached Files:

Image10.jpg, cat types.jpg.

tomas

tomas Senior Member

Red Dwarf said: ↑ ... So my question is would you get some of the improved seakeeping of a SWATH, without making a SWATH, if you make a catamaran that has hulls that are very short vertically and mounted on tall struts as shown in the bottom diagram? ... Click to expand...

Ad Hoc

Ad Hoc Naval Architect

tomas has given you a very clear and succinct answer....it's the SWA part. But even ignoring that aspect....the structural aspects of swaths is another. Just taking that to one side (ignoring the seakeeping)...looking at the figure on the bottom, thin struts, wafer thin struts....seriously...you think that is LESS complex than a swath, the figure above. You wont find any material able to take the transverse load that thin. Unless of course you use HTS and the whole boats weighs way beyond what you expected and needs to be short otherwise the weight growth means she'll probably sink. It is horses for courses.....you want a fast boat...great...what else. Its the "what else" that determines the selection of hull form...and it is not a one liner either. No such thing as a free lunch.  
Yes I agree, the key is a small water plane area. In another thread Ad Hoc posted the following; The simple rule of thumb is the ratio of WPA to its displacement, thus:- Ratio = WPA/(displacement)^2/3 All boats have a ratio in the 5-ish range, all boats from the QE2 down to a simple canoe. Some are a tad higher and some a tad lower, but they are all in the same ratio range, in a nutshell. A swath is in the range 0.8-1.5. This is a huge difference. In the case I am asking about the hulls have very little freeboard, let's say 6 inches. So a wave 2 foot tall will crest over the hull. Essentially placing the hull under the water. The crest of a wave large enough to submerge the hull will only see the water plane area of the struts. Obviously this is all very dynamic with the hull being exposed and submerged regularly depending on sea conditions. I am looking for an explanation of what is going on and if a better ride will result from the hull having very little freeboard. In the diagram below that is dimension "f". I know there will be some packaging issues but for now I am just interested in seakeeping.  

800px-Ship_length_measurements.png

Ad Hoc, we were posting at the same time. Thanks for your response. I am not interested in speed. I am interested in ride comfort. I have seen plenty of videos of catamarans that ride very poorly, the hobby horse thing or doing the rolling coupled "vomit comet" twist. If the freeboard doesn't matter at all could I get an improved ride just with active planes on a normal catamaran? Ad Hoc, one more question, What are the units in the expression, Ratio = WPA/(displacement)^2/3?  
Red Dwarf said: ↑ In the case I am asking about the hulls have very little freeboard, ... Click to expand...
Thank you for clearing that up. Sometimes I have to ask dumb questions to see the obvious. That's what I love about this forum, plenty of experience to help us rookies.  

DCockey

DCockey Senior Member

Ad Hoc said: ↑ Red Dwarf said: ↑ Ad Hoc, one more question, What are the units in the expression, Ratio = WPA/(displacement)^2/3? Click to expand...
DCockey said: ↑ So the numerical value will be close to the non-dimensional ratio of WPA/(displacement volume)^2/3, with the exact relationship dependent on the density of water used for the ratio of displacement mass to displacement volume. Click to expand...
Red Dwarf said: ↑ ... ... but for now I am just interested in seakeeping. Click to expand...

Susitna OSJ57GPAothers06_large.jpg

tspeer

tspeer Senior Member

Red Dwarf said: ↑ ...So my question is would you get some of the improved seakeeping of a SWATH, without making a SWATH, if you make a catamaran that has hulls that are very short vertically and mounted on tall struts as shown in the bottom diagram? The idea is waves under the bridgedeck height just pass over the hulls making it more like a SWATH for a short period of time as the wave passes. This would avoid the SWATH problems with excess surface area and sensitivity to weight. Basically, at rest and in smooth water it is a normal catamaran, only when a wave is large enough to engulf the pontoon will it act similar to a SWATH. I definitely see this concept using active control planes, just as a SWATH does, to control motion. Click to expand...

[​IMG]

tomas said: ↑ If you're ambitious, you could attempt a variable-draft, dual-mode, catamaran/SWATH approach like the Susitna . Click to expand...

:p

tspeer said: ↑ Isn't this the basic idea behind wave-piercing catamarans? Click to expand...
Ad Hoc said: ↑ No need to be ambitious It's free...yup, free: http://news.yahoo.com/alaska-borough-wants-away-expensive-ferry-222717872.html Click to expand...
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BMcF

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Red Dwarf said: ↑ I've been using the search function and reading about SWATH designs. Lots of good info but they seem like way too much trouble for an amateur. As far as I can tell the only thing they do well is seakeeping. In all other respects the SWATH seems to be difficult to design correctly, expensive, complicated and not much performance. I also have been looking at catamaran designs, they are well known and documented so I won't go into details. While browsing the web I came across the Stability 60 catamaran/SWATH vehicle. They claim to have the best of both worlds by using catamaran hulls on struts that can, when needed, be ballasted down to function as a SWATH. This seems way too complex for my taste. . Click to expand...

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155m SWATH ‘The Streets of Monaco’ superyacht by Yacht Island Design

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Written by Chelsea Smith

Introducing a new era in luxury yachting, the themed yacht.

Yacht Island Design has been formed by a creative team who are driven by a passion to deliver something different. That difference is themed yachts, the first of which is called The Streets of Monaco superyacht design. The art of producing a themed yacht is to seamlessly weave a story into every element of the design and is achieved via extensive consultation with the client during the initial phases of the design process. This focus allows the creation of a truly unique environment from the overall exterior shape down to the smallest interior detail. Yacht Island Design’s attention to detail is shown in the first proposal, a 155m SWATH vessel that takes the principality of Monaco to the ocean.

155m SWATH ‘The Streets of Monaco’ superyacht by Yacht Island Design Exterior render and zoning diagram

155m SWATH ‘The Streets of Monaco’ superyacht by Yacht Island Design Exterior render and zoning diagram

Yacht Island Design has selected the SWATH platform as its prime focus. Not only does this platform offer the best seakeeping ability but the exceptionally wide beam for its length gives the maximum flexibility to achieve best utilisation of space. It also allows for the exploration of bold and daring design ideas without the restrictions of a conventional hull shape. Yacht Island Design are in collaboration with BMT Nigel Gee on several SWATH proposals. As the world’s leading independent provider of naval architecture and engineering to the large yacht industry they bring significant experience in the naval architecture of SWATH vessels.

In order to showcase its capabilities, Yacht Island Design has set about developing several concept proposals. The first of these is ‘The Streets of Monaco’. This is a 155m SWATH yacht built predominantly in steel with the use of aluminium in the upper superstructure. With a maximum speed of 15 knots she transports her 70 crew and 16 guests using diesel electric propulsion. The design theme called for a unique yacht that reflected the style and sophistication of the principality and centres around three main communal areas, ‘The Streets of Monaco’, ‘The Oasis’ and ‘The Grand Atrium’.

‘The Streets of Monaco’ is the focal point of our story and the anchor for the themes that run throughout the yacht, revolving around a recreation of the famous  Monao Grand Prix race circuit. This fully functional kart circuit sets the stage for other famous locations seen on a lap of the principality. The Casino, Hotel de Paris, Cafe de Paris, La Rascasse, and of course the famous Loews hotel and tunnel complex are all featured and house many of the major interior communal spaces. There are four major areas to the external deck space. On the upper deck is ‘Casino Square’ featuring a large glass bottomed fountain situated in a tranquil garden setting. Heading past the Casino you arrive on the roof of the ‘Loews hotel’ which extends to the bow. This area features a small swimming pool, large Spa Pool and expansive sun decks with BBQ facilities. Moving aft we arrive at the main swimming pool which represents the Port Hercule harbour with a maximum depth of 3m incorporating a swim-in Spa Pool/bar. Continuing to the stern we pass into an area focussed on sports. The multi-use court can be configured to a variety of activities including tennis and basketball. Completing this floating city is the Prince’s Palace which as you would expect, houses the owners private apartment in a prime location on the port bow.

155m SWATH ‘The Streets of Monaco’ superyacht by Yacht Island Design The Oasis render

155m SWATH ‘The Streets of Monaco’ superyacht by Yacht Island Design The Oasis render

`The Oasis’, on the The Streets of Monaco superyacht design located aft, acts as the main boarding point for the yacht, an expansive area modelled on the gardens just outside the  Monaco Casino. On entering the Oasis, attention is immediately drawn to the central waterfall feature consisting of upper level pools cascading down into the lower pool and Spa Pool. Radiating from the pool are numerous shrub lined pathways and secluded seating areas. Large exterior windows surround the entire aft section of the oasis, extending to the full double deck height ceiling allowing natural light to flood the space. Located forward on the lower level is the Spa, with manicure and hair salon, private massage suites, sauna/steam rooms and a large relaxation lounge featuring a spa pool with bar. To either side of the spa entrance are located grand marble staircases and elevator access to the mezzanine, with a cafe bar and magnificent views of the gardens below. Forward of the Cafe Bar are large porthole windows offering unique under water views into the main external swimming pool. Opposite this feature lies access to the fully equipped Gym which boasts uninterrupted views over the ocean. Nestled between the feature portholes and the Gym is an art lined hallway which acts as the entranceway to `The Grand Atrium’.

155m SWATH ‘The Streets of Monaco’ superyacht by Yacht Island Design Owners Apartment - Living Room

155m SWATH ‘The Streets of Monaco’ superyacht by Yacht Island Design Owners Apartment - Living Room

`The Grand Atrium’ is the central hub of the yacht, linking the upper and lower living areas. At its centre is a large, ornate spiral staircase which surrounds a waterfall feature that is supplied by the glass bottomed fountain from the garden area above. A small cafe/bar area ensures this feature can be enjoyed while relaxing in comfort. The seven guest suites are located off of the lower atrium level and vary in size, from the more modest 135 m2 suite to the grand 356 m2 VIP suites. All include their own reception room, bathroom, dressing room, bedroom and balcony. The VIP suites have the added luxury of a private office. On the same level and located centrally to the guest suites are the Library, Communal Office, Communal Balcony and Cinema. The upper level of the Atrium leads to the main entertainment areas and the Owners suite. The entertainment areas comprise the Main Saloon with separate Havana room and adjoining wine cellar, the Dining Room, Casino and Dance Hall. At the farthest end of the Atrium lies the Owners Apartment. Connected to all decks via a private lift and spread over 3 floors, it covers a total 1460m2 of floor space. As well as the usual lounge with a feature fire place and double height ceiling, office, bedroom, bathroom, his/hers dressing rooms, the apartment also benefits from a listening room, private courtyard, sunroom, numerous balconies and private sundeck with a Spa Pool/swimming pool.

‘The Streets of Monaco’ superyacht by Yacht Island Design VIP Suite

‘The Streets of Monaco’ superyacht by Yacht Island Design VIP Suite

Other Key features

Two large tender garages to store all manner of launches, offshore power boats, jet skis etc. Dive dock and Submarine, deployed from one of the submerged hulls. Multi configurable sports court sized to championship tennis regulations also doubles as a Heli-Pad. Ample crew quarters including a gym and private sun terrace. Crew can access all areas of the yacht via a network of corridors allowing for maximum guest privacy. Sea level ‘Beach’ decks situated aft in both struts.

What’s next for Yacht Island Design?

Yacht Island Design’s second proposal is an 85m yacht based around a ‘Pacific Island’ theme, a notable departure from the architectural feel of the ‘Monaco’ design with a flowing organic shape and natural themed features. This concept illustration is a small teaser of what is to follow.

85m yacht with a ‘Pacific Island’ theme, by Yacht Island Design

85m yacht with a ‘Pacific Island’ theme, by Yacht Island Design

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6 Beaches for Budding Swimmers, Surfers and Castle Builders

For families with children, we found half a dozen beaches in the United States and Mexico, each tailored to a particular summer activity.

The small hands of two children can be seen building sand castles with pails and molds in fine, beige beach sand.

By Freda Moon

A family beach vacation is an American classic. But depending on their children’s ages and inclinations, some families may be drawn to different kinds of shorelines: those featuring clear, calm water for snorkeling and learning to swim; or, for shell collectors and young naturalists, sandy stretches carpeted with seashells or bordered by tide pools. For castle builders, fine sand is a must, while would-be surfers need tidy waves, ready to ride. Here are six great beaches in the United States and Baja California for family-favorite summer activities.

For castle builders: Mission Beach , San Diego

San Diego’s temperate climate allows for barefoot beach days year-round. For those who’d rather build with sand than lie in it, Mission Beach has another advantage: San Diego Sand Castles and the sand sculptor JT Estrela. Mr. Estrela, a former math teacher, offers lessons in the art of sand castle construction on this family-friendly Southern California beach, where the sand is perfect for castle building: The grains are fine but not too silty, clean below the tide line, free of shells and rocks, and pack hard.

In his two-to-three-hour sessions (starting at $160 for two people, $20 for each additional person), Mr. Estrela works with families to build elaborate five-foot-tall castles. The goal is for participants to “feel like this insider of arcane knowledge,” he said.

While the best sand in the San Diego area is at the offshore city of Coronado in San Diego Bay, Mr. Estrela prefers working with families at Mission Beach. Known for its boardwalk amusement park, Belmont Park ; historic beachfront swimming pool, the Plunge ; and excellent playgrounds, it’s particularly fun for kids. The smell of cotton candy and hot dogs hangs in the air, mingling with shrieks from the Giant Dipper, Belmont’s 1925 wooden roller coaster, squawking sea gulls and salt spray. Its biggest downside is its popularity, which means parking can be a challenge.

For new swimmers: Onekahakaha Beach Park , Hilo, Hawaii

In an archipelago known for spectacular beaches, Onekahakaha Beach Park , on the rugged, volcanic coast of the Big Island, may seem a counterintuitive choice. At Onekahakaha, with its two large, sandy-bottomed ocean pools enclosed by lava rock walls and backed by palm trees and an expansive grassy lawn, the sand is mostly below the surface.

Separated from the Pacific Ocean’s notoriously powerful waves and rip currents, the seawater within the pools is warm and placid, protected and shallow, which makes it excellent for little kids learning to swim, as well as for older kids to snorkel. It’s also home to nonthreatening marine life (no sharks here), including green sea turtles.

Though the water is only about waist-deep on an adult, there are lifeguards, adding to Onekahakaha’s reputation for safety. And without a wide swath of sand between the pools and the shoreline path, the water is accessible for strollers and wheelchairs. There’s also a swing set, picnic tables and proximity to the lush Hilo area.

As long as you’re on the Big Island, the site of several active volcanoes, visit the thermal pools alongside some of its beaches, including Pohoiki Black Sand Beach at Isaac Hale Beach Park , 40 miles south of Onekahakaha. The ocean there may be a bit rough for young swimmers, but it’s a great place to show children a fresh lava flow.

For would-be surfers: Wrightsville Beach , N.C.

Wrightsville Beach is considered by many surf historians to be the home of East Coast surfing and one of the first places outside Polynesia and the Pacific Rim for the sport to catch on .

It also has some of the best beginner’s breaks in the United States , said Sean Griffin, 37, a surfing instructor and the father of a 5-year-old, who started riding the local break when he was 8.

He points out that Wrightsville is the only surfing beach in the state that has clear, blue water. Being able to see one’s hands and feet and the sandy bottom “makes anyone feel more comfortable in the ocean,” he said.

At Surf With Sean , Mr. Griffin offers private 90-minute lessons ($95 to $120) to surfers as young as 3 and into their 80s, as well as surf camps for kids ($425 per week). “There’s no reason they shouldn’t be able to learn or give it a shot,” said Mr. Griffin, who provides all gear in all sizes, including adaptive equipment.

There’s more to the area’s kid appeal than its waves. Mr. Griffin points to Johnnie Mercers Fishing Pier , at the center of the beach, where his son “loves seeing all the salty fisherman pulling in fish,” and the big, modern playground at Wrightsville Beach Park .

For tide pool explorers: Carkeek Park , Seattle

Naomi Tomky — a lifelong Seattleite, author of “ The Pacific Northwest Seafood Cookbook ” and mother of two daughters, 6 and 8 — recommends Carkeek Park in Seattle for an immersive experience in Puget Sound marine life. At low tide, Ms. Tomky said, the narrow beach “just goes out for ages,” exposing tide pools filled with starfish, sea snails, anemones and “many, many crabs, from the size of your fingernail to the size of your hand.”

Unlike tide-pooling elsewhere on the West Coast, where the powerful Pacific Ocean requires caution because of dangerous sneaker waves , Puget Sound is rich with life but calm enough for Ms. Tomky to let her daughters explore on their own.

Just 30 minutes from downtown Seattle, Carkeek is part of the Seattle Aquarium’s Beach Naturalist Program , which sends naturalists to various shorelines around the area.

Along with the below-the-tide-line intrigue, Carkeek is also known for an annual spectacle: spawning salmon. In the fall, it’s possible to stand over the park’s Piper’s Creek and watch the fish — a sacred Indigenous symbol of the Pacific Northwest — on the run.

“It’s one of the coolest things you can see,” said Ms. Tomky, “to understand how these fish share the city with us as they swim back into their former home.”

For shell hunters: Tigertail Beach , Marco Island, Fla.

Sanibel Island, a barrier island just off Fort Myers, Fla., is one of the most famous shelling destinations on the planet. That popularity comes with a downside: It’s often picked over by enthusiasts who hit the shoreline at dawn. The island is also still recovering from Hurricane Ian, which badly damaged its infrastructure in 2022.

As an alternative, the shelling guide Evan Kuperman (a.k.a. Captain Evan) recommends Tigertail Beach on Marco Island, about an hour south.

Mr. Kuperman, a Florida master naturalist , operates Sand Dollar Shelling Tours . His tours ($125 per adult, $90 per child, and families of up to six people for $650) take guests by boat to places like the Ten Thousand Islands , a mangrove mud flat habitat and National Wildlife Refuge.

For visitors unable to join one of his trips, Mr. Kuperman said that Tigertail, a publicly accessible beach ($8 parking fee), offers exceptional shelling.

Marco Island is more built up than Sanibel, but Tigertail, at the island’s north end, is a county-owned park with a lagoon and a position facing the Gulf of Mexico that lends itself to accumulating seashells, including rare and striking ones, like the spiny ornamented lace murex and reddish brown banded tulip .

But everyone is hoping for a junonia, or Juno’s volute, a sea snail that has to travel far in churning waters to reach the beach intact. “You don’t find it,” said Mr. Kuperman, “it finds you.”

For young snorkelers: Playa el Chileno , Los Cabos, Mexico

About halfway between bustling Cabo San Lucas and San José del Cabo, Playa el Chileno is no longer an undeveloped local secret. Now backed by the sprawling Auberge resort Chileno Bay Resort & Residences , the beach remains public and comparatively tranquil. Awarded the Blue Flag certification for meeting stringent environmental standards, Chileno is exceptionally well maintained.

While catamaran snorkeling tours come and go from Chileno Bay, it’s also possible to reach the reef from the shore, which makes it good for inexperienced snorkelers who might find it intimidating to leap into deep water without easing their way in. High Tide Sea Expeditions offers snorkeling excursions via kayak that start at nearby Playa Santa Maria, hug the coast and arrive at Chileno by water. For younger kids and anyone who prefers more time in the water, there’s a guided two-hour tour that visits both beaches by car ($95 to $130 per person, including equipment).

Among the roughly 50 species of fish that snorkelers might encounter along Chileno’s rocky outcroppings and coral reef, there are large tuna, sea turtles, puffer fish, Panamic green moray eels, Cortez angelfish and blacknosed butterflyfish — among many other colorful creatures. The coral here is less vibrant than some places, but the number and variety of fish are thrilling.

Freda Moon, a frequent contributor to the Travel section, lives on a boat in San Francisco Bay with her husband and two kids. Her upcoming National Geographic book with the coauthor Ashley Harrell, “100 Beaches of a Lifetime,” will be published next year.

Follow New York Times Travel on Instagram and sign up for our weekly Travel Dispatch newsletter to get expert tips on traveling smarter and inspiration for your next vacation. Dreaming up a future getaway or just armchair traveling? Check out our 52 Places to Go in 2024 .

Get Out on the Water This Summer

3 6 Hours in Traverse City, Mich.:  Explore the laid-back city loved for its annual cherry festival, unspoiled lake vistas and access to epic dunes .

6 Great Beaches for Families:  For families with children, we found half a dozen beaches in the United States and Mexico , each tailored to a particular summer activity.

Surfing in Texas: A wave pool in Waco offers consistent conditions, affordable prices and a friendly vibe for beginner surfers .

Hidden Island Treasures: Being far from everywhere is the point in the Magdalens, a colorful and tranquil Quebec island chain  north of Prince Edward Island.

A Famous Massachusetts Inn: A writer returns to a classic Nantucket hotel, where he worked 50 years ago, to ponder how he, the island, and the newly refurbished inn have changed .

5 Waterfront Hotels : Whether it’s by a river, lake or ocean, or in a castle, cottage or on the site of a former torpedo factory, here are places to stay where the water is never far away .

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  1. $2 Catamaran Ep. 4

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COMMENTS

  1. Small-waterplane-area twin hull

    A narrow waterline distinguishes a SWATH ship from a conventional catamaran A SWATH ship resembles a conventional catamaran.The twin hulls (blue) remain completely submerged. A small waterplane area twin hull, better known by the acronym SWATH, is a catamaran design that minimizes hull cross section area at the sea's surface. Minimizing the ship's volume near the surface area of the sea, where ...

  2. Eastern Swath, Used Catamarans for Sale

    Discover a vessel that redefines stability and power - the 1999 Eastern Ship Building Swath 120. Meticulously crafted with cutting-edge design, this SWATH (Small Waterplane Area Twin Hull) catamaran is equipped with twin Allison 501KF turbines, offering an unparalleled combination of efficiency, reliability, and sheer exhilaration on the water.

  3. Smooth Sailing: Pros and Cons of a SWATH Vessel

    2.0 Advantages. SWATHS are specialized ships with one major goal: excellent seakeeping capability. SWATH ships have the same massive deck area of a catamaran, with far superior seakeeping capabilities. In Figure 2‑1, compare the motions of the monohull in the foreground to the SWATH in the background.

  4. Small waterplane area twin hull (SWATH)

    Small waterplane area twin hull (SWATH) marine. A catamaran with unconventionally shaped hulls: two submarine-like floating bodies lie deep under the water surface and thus create the required buoyancy. On the waterline the vessel offers the least possible working surface (water plane area) so that the backward forces are low.

  5. Eastern Swath boats for sale

    Meticulously crafted with cutting-edge design, this SWATH (Small Waterplane Area Twin Hull) catamaran is equipped with twin Allison 501KF turbines, offering an unparalleled combination of efficiency, reliability, and sheer exhilaration on the water. **Key Features:** 1.

  6. What is a SWATH Ship?

    What is a SWATH Ship? A SWATH ship is the abbreviated form of the word 'Small Waterplane Area Twin Hull' ship. Swath ships are designed in such a way that they have two or dual hulls instead of the conventional single hull. Technically, a swath ship is a type of a catamaran. The two hulls of the swath ship are built so as to offer the ...

  7. NURJA Yacht • Alexander Dreyfoos $15M Catamaran Superyacht

    The NURJA is not your ordinary catamaran yacht. She is designed as a Small Waterplane Area Twin Hull (SWATH), a cutting-edge concept that ensures a smooth sailing experience even in rough seas. The SWATH design reduces the yacht's waterline area, minimizing the effects of waves and providing a more stable and comfortable ride for passengers.

  8. Eastern Swath 1999

    Discover a vessel that redefines stability and power - the 1999 Eastern Ship Building Swath 120. Meticulously crafted with cutting-edge design, this SWATH (Small Waterplane Area Twin Hull) catamaran is equipped with twin Allison 501KF turbines, offering an unparalleled combination of efficiency, reliability, and sheer exhilaration on the water.

  9. SILVER CLOUD Yacht For Sale

    Silver Cloud is a 134'6″ SWATH Yacht built by Abeking & Rasmussen in Germany. SWATH stands for Small Waterplane Area Twin Hull. The outstanding feature is smooth sailing in rough seas. A&R has perfected this design by building numerous SWATH ships for pilot service in the North Sea, an area known for very rough conditions.

  10. SWATH (Small Waterplane Area Twin Hull)

    This is the first DP2, twin-hulled SOV in the world and the first to serve three different wind farm sites. The SWATH provides a stable platform and large, broad decks for offshore crew activities services. The new vessel significantly improves safety, comfort and workability for wind farm technicians - even in the roughest sea conditions.

  11. 63m SWATH Explorer Yacht by Abeking & Rasmussen

    The new 63m SWATH Explorer Yacht by Abeking & Rasmussen features a neatly horizontal deck at all times! Thanks to the small waterplane area exposed to the surface waves, a SWATH-ship is not 'thrown to the side' or 'falling into the hole between the waves' crests' like a monohull or a conventional catamaran. The rolling and pitching ...

  12. Solar Impact Catamaran With SWATH Technology Is Smooth, Silent

    The folding hardtop, coachroof, and folding wings are covered in 300 square meters (3,229 square feet) of solar panels that power the 800kWh battery pack and twin 500 kW electric motors. This ...

  13. Abeking & Rasmussen 40M SWATH

    Like a catamaran, a SWATH has two hulls connected by a cross-deck well above the waterline. But the similarity ends there. In cross-section the hulls are cylindrical, like submerged torpedoes, to bore through the water with minimum resistance. And connecting the hulls to the cross-deck is a pair of narrow vertical struts that produce a small ...

  14. Eastern Swath boats for sale

    1999 Eastern Swath. US$750,001. ↓ Price Drop. WORLDWIDE YACHT SALES | Amelia, Louisiana. Request Info. <. 1. >. * Price displayed is based on today's currency conversion rate of the listed sales price.

  15. The Swath 75 by Fincantieri

    The term SWATH translates as Small Waterplane Area Twin Hull but to all intents and purposes, the Swath 75 is a catamaran. Fincantieri's first, in fact. But that is not its only record. The Andrea Vallicelli-designed 75m is also the yard's first fuel cell propulsion yacht. This particular system doesn't recover energy it requires from

  16. 1999 Power Catamaran Eastern for sale

    For those seeking a vessel that combines cutting-edge design, unmatched stability, and the power of Allison 501KF turbines, the 1999 Eastern Ship Building Swath 120 stands as an extraordinary option. Whether for private ownership, commercial use, or specialized expeditions, this SWATH catamaran is ready to redefine your maritime experience.

  17. Survey Cat 280

    Survey Cat 280. SURVEY CAT 280 is a full aluminium semi-SWATH catamaran dedicated to survey and scientific missions. Based on MAURIC's expertise in the semi-SWATH hull form design, MAURIC SURVEY CAT 280 has been designed to optimize its seakeeping and manoeuvrability performances during survey operations in coastal area.

  18. SWATH vs Catamaran question

    A discussion about the seakeeping benefits of SWATH and catamaran hull forms, and a possible hybrid design with short hulls on struts. Experts and amateurs share their opinions and insights on the pros and cons of different boat designs.

  19. 155m SWATH 'The Streets of Monaco' superyacht by Yacht Island Design

    This is a 155m SWATH yacht built predominantly in steel with the use of aluminium in the upper superstructure. With a maximum speed of 15 knots she transports her 70 crew and 16 guests using diesel electric propulsion. The design theme called for a unique yacht that reflected the style and sophistication of the principality and centres around ...

  20. Elektrostal Map

    Elektrostal is a city in Moscow Oblast, Russia, located 58 kilometers east of Moscow. Elektrostal has about 158,000 residents. Mapcarta, the open map.

  21. THE 10 BEST Restaurants in Elektrostal (Updated May 2024)

    Top Restaurants in Elektrostal. We found great results, but some are outside Elektrostal. Showing results in neighboring cities. Limit search to Elektrostal. 1. Restaurant Khalif. One of amazing restaurant ever , you need to visit guys, من اجمل المطاعم الذي... The impressions are positive. The food is very tasty.

  22. 6 Best Beaches for Kids in the U.S. and Mexico

    And without a wide swath of sand between the pools and the shoreline path, the water is accessible for strollers and wheelchairs. ... While catamaran snorkeling tours come and go from Chileno Bay, ...

  23. Elektrostal, Moscow Oblast, Russia

    Elektrostal Geography. Geographic Information regarding City of Elektrostal. Elektrostal Geographical coordinates. Latitude: 55.8, Longitude: 38.45. 55° 48′ 0″ North, 38° 27′ 0″ East. Elektrostal Area. 4,951 hectares. 49.51 km² (19.12 sq mi) Elektrostal Altitude.

  24. Category:Gorodok factory

    Media in category "Gorodok factory" The following 41 files are in this category, out of 41 total.