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The ultimate J Class yachtspotter’s guide

The J Class is undoubtedly one of the most beautiful and powerful classes of sailing yacht in the world. An original fleet of 10 was constructed in the 1930s for the purpose of competing in the America’s Cup, but in a sad twist of fate, only a few were able to survive the cull for metal during World War II. Some were later salvaged from the scrapheap and rebuilt as modern-day racers while others were constructed as replicas by owners who admired their classic lines and racing credentials. Nine J Class sailing yachts race today but could you tell an original from a replica? Could you identify which J Class yacht is which by its sail number? Here's an essential guide to the J Class fleet... 

Sail number : JK3 Length : 36.5m Year of build : 1929

With more than 80 years under her keel, Shamrock V is one of the most historic sailing yachts still afloat today having been built by Camper & Nicholsons in 1929. Her current owner bought Shamrock V in March 2016 and in the process inherited a legacy. This 36.58 metre is the original J Class yacht and the only one with a wooden hull to have survived to the present day. Her original owner Sir Thomas Lipton is remembered as the lovable loser of the America’s Cup , having unsuccessfully challenged on five separate occasions between 1899 and 1930, taking each defeat with characteristic good grace.

Sail number : JK4 Length : 39.56m Year of build : 1934

Endeavour was launched by Camper & Nicholsons in 1934 and is hailed as one of the most iconic sailing yachts in the world . Commissioned by Sir Thomas Sopwith, this 39.56 metre design was a highly rated contender heading into the 16th America’s Cup, but ended up losing 4-2 to Harold S. Vanderbilt's Rainbow . However, this is widely acknowledged to have been more down to tactics than design or performance. After spending the better part of 50 years languishing in obscurity, she was meticulously restored by Dutch yard Royal Huisman in 1989 and was most recently refitted in 2011 by New Zealand yard Yachting Developments . 

Sail number : JK7 Length : 38.5m Year of build : 1933/2016

Velsheda was built in steel in 1933 for WL Stephenson, the chairman of Woolworths in Britain, and named after his three daughters Velma, Sheila and Daphne. This 38.5 metre yacht is the only original J Class not to have been built for the America's Cup . Between 1937 and 1984 she languished in a mud berth on the Hamble River before scrap-metal merchant Terry Brabant rescued her and chartered her on a shoestring budget with no engine, mostly in the Solent but also in the Caribbean. In 1996 she was purchased by Dutch fashion entrepreneur Ronald de Waal who commissioned Southampton Yacht Services to rebuild her. Since then de Waal has raced her extensively .

Sail number : J5 Length : 41.55m Year of build : 2003

Ranger is a 41.55 metre replica of the J Class yacht of the same name, which was built for the 1937 America’s Cup by a syndicate led by railroad heir Harold Vanderbilt. Starling Burgess and Olin Stephens had been asked to produce eight sets of lines and the one selected as most suitable for the conditions expected off Newport, Rhode Island — design number 77C — was one of Burgess', although Stephens later helped with some refinements. Known as 'The Super J', the original  Ranger comprehensively beat Endeavour II in the Cup and won all but two of the other 33 races in which she competed that year. She never sailed after that and was broken up in 1941. With the design optimised by Reichel-Pugh , the new Ranger was built in steel — true to the original but unlike the subsequent modern Js — by Danish Yachts in 2003 for an American owner. 

Sail number : JK6 Length : 42.1m Year of build : 2009

The reincarnation of the 1937 launch Endeavour II , Hanuman was launched in 2009 by Dutch shipyard Royal Huisman . This 42.1 metre yacht features her predecessor’s original Charles E. Nicholson design, while the underwater geometry is courtesy of Dykstra Naval Architects . After completing the rebuilds of Endeavour , Shamrock V and Velsheda , Hanuman was Dykstra's first J Class new build project. Commissioned by serial yacht owner Jim Clark , Hanuman is named after the son of the Hindu wind god, which it flies on its spinnaker, and her regatta performances have backed up this name. She took first place at the 2017 St Barths Bucket , which saw six J Class yachts battling it out on the high seas.

Sail number : JH1 Length : 43.4m Year of build : 2010

Lionheart is based on Burgess and Stephens design number 77F, which was one of those rejected in favour of 77C for the 1937 America’s Cup. However, after extensive research by Hoek Design Naval Architects , 77F was considered to be the best set of lines for the variety of racing conditions likely to be encountered at regattas around the world today. Lionheart was built in aluminium by Bloemsma and Claasen Jachtbouw in Holland, and was launched in the summer of 2010. Her first owner's business commitments forced him to sell her and she was purchased in mid-2011 by Dutchman Harold Goddijn, the founder of Tom Tom. At 43.4 metres overall and with a stunning 17 metre overhang, she is the second longest J afloat. Lionheart became the first Hoek-designed J to hit the race course and made its debut at the Superyacht Cup in Palma.

Sail number : JH2 Length : 39.96m Year of build : 2012

The original Rainbow was launched in 1934 at the Herreshoff yard in New England after a mere 100 days under construction and went on to win the America’s Cup in the same year. However, she was requisitioned during World War II and eventually scrapped. The modern Rainbow  is an altogether more high-tech affair — built at Holland Jachtbouw in 2012 as the fourth of the new generation Js. She was built for an experienced sailing yacht owner to a design by Dykstra Naval Architects and is the first J to be fitted with a hybrid propulsion and power system. Rainbow is currently listed for sale . When heeled over, its red underside is a dead giveaway for yachtspotters out there.

Sail number: J8 Length : 42.62m Year of build : 2015

Topaz is based on an unbuilt 1938 design by Frank C Paine, the son of the three-time America’s Cup winner General Charles J Paine. Her modern aluminium incarnation measures 42.62 metres and was launched by Dutch yard Holland Jachtbouw  in 2015. Hoek Design Naval Architects, who styled Topaz inside and out, describe her as “a good all-round performer”. She was the longest J by waterline length at the time of her launch but was later dethroned by Svea .

Sail number : JS1 Length : 43.6m Year of build : 2017

The newest and longest member of the J Class fleet, Svea was launched by Dutch yard Vitters in February 2017 measuring 43.6 metres. Her design by Hoek Design Naval Architects incorporates an integrated traditional long keel from the original 1937 drawings by Swedish designer Thore Holm, which were unearthed by yachting historian John Lammerts van Beuren. However, the designers have brought the 75-year-old design right up-to-date with an aluminium hull and 53.75 metre carbon fibre main mast. As a result, Svea displaces just 182 tonnes — two tonnes less than Hanuman and six tonnes less than Ranger .

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• Sailboat Guide

J/122 is a 39 ′ 11 ″ / 12.2 m monohull sailboat designed by Rod Johnstone and built by J Boats and J Composites starting in 2008.

Rig and Sails

Auxilary power, accomodations, calculations.

The theoretical maximum speed that a displacement hull can move efficiently through the water is determined by it's waterline length and displacement. It may be unable to reach this speed if the boat is underpowered or heavily loaded, though it may exceed this speed given enough power. Read more.

Classic hull speed formula:

Hull Speed = 1.34 x √LWL

Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio .311 Hull Speed = Max Speed/Length ratio x √LWL

Sail Area / Displacement Ratio

A measure of the power of the sails relative to the weight of the boat. The higher the number, the higher the performance, but the harder the boat will be to handle. This ratio is a "non-dimensional" value that facilitates comparisons between boats of different types and sizes. Read more.

SA/D = SA ÷ (D ÷ 64) 2/3

• SA : Sail area in square feet, derived by adding the mainsail area to 100% of the foretriangle area (the lateral area above the deck between the mast and the forestay).
• D : Displacement in pounds.

Ballast / Displacement Ratio

A measure of the stability of a boat's hull that suggests how well a monohull will stand up to its sails. The ballast displacement ratio indicates how much of the weight of a boat is placed for maximum stability against capsizing and is an indicator of stiffness and resistance to capsize.

Ballast / Displacement * 100

Displacement / Length Ratio

A measure of the weight of the boat relative to it's length at the waterline. The higher a boat’s D/L ratio, the more easily it will carry a load and the more comfortable its motion will be. The lower a boat's ratio is, the less power it takes to drive the boat to its nominal hull speed or beyond. Read more.

D/L = (D ÷ 2240) ÷ (0.01 x LWL)³

• D: Displacement of the boat in pounds.
• LWL: Waterline length in feet

Comfort Ratio

This ratio assess how quickly and abruptly a boat’s hull reacts to waves in a significant seaway, these being the elements of a boat’s motion most likely to cause seasickness. Read more.

Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam 1.33 )

• D: Displacement of the boat in pounds
• LOA: Length overall in feet
• Beam: Width of boat at the widest point in feet

Capsize Screening Formula

This formula attempts to indicate whether a given boat might be too wide and light to readily right itself after being overturned in extreme conditions. Read more.

CSV = Beam ÷ ³√(D / 64)

J/122E (built in France) has same hull and rig with updated deck, coach roof, and interior.

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