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J Class
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Known as the "Super J", Ranger was designed to the maximum waterline length allowed by the Universal Rule, 87', by a collaboration between Sparkman &Stephens and Starling Burgess in 1937. Extensive tank testing of numerous hull models, allowed the final decision to be based on which hull would perform best in the expected conditions of the America's Cup off Newport, Rhode Island.

RANGER Leeward Beam J Class RANGER Starboard Stern
The Majestic J Class Racers

Riding a recent surge of interest in the class, S&S has reanalyzed the plans and model-test data –the DNA of the J Class as it were–it used in the development of 1937 America's Cup winner Ranger. The renewed interest in these sublimely beautiful, supremely powerful racing yachts, coupled with new regulations established by the J Class Association, has turned what was historically cherished intellectual property into new opportunities for interested clients.

Olin et all Office Ranger Testing Design 77 Model Testing 1 Design 77 Model Testing 2 Ranger 1937
We've been contacted by several serious yachtsmen about building J Class yachts for racing, cruising and charter. We believe momentum is building toward creation of more of these magnificent vessels.
Anyone lucky enough to be on the Solent between mainland England and the Isle of Wight in August 2001, witnessed a sight unparalleled in the annals of yachting: the three surviving J Class yachts–Endeavour, Shamrock V and Velsheda–engaged in a series of races celebrating the America's Cup Jubilee.
The Jubilee brought together what many believe was the most impressive fleet of classic and modern yachts and yachting luminaries the sport has ever seen. But for all the historical horsepower on display that week, nothing stirred the hearts and minds of sailors like the sight of the mighty Js dicing in the choppy waters off Cowes. One could only imagine what a fleet of seven or eight Js with all their power and grace might look like converging on a weather mark or flying downwind for the gun with thousands of square feet of sail filling the horizon. Today, S&S is poised to make that dream a reality.
In 2000, the owners of the existing J Class yachts formed an association to promote, protect and develop the interests of the group. In 2003, a yachtsman named John Williams, launched a version of Ranger. She was the first to be built to the new rules that govern the class. In a more recent indicator of rising interest in the class, Netscape founder James Clark announced he has commissioned Royal Huisman Shipyard in the Netherlands to build a replica of Endeavour II, the British yacht that lost to Ranger in the 1937 Cup.
The J Class was based on the Universal Rule, which was popular among large yacht sailors in the first third of the 20th century. The Universal Rule took into account length, sail area and displacement. The J Class had a maximum rating of 76 feet under the Universal Rule and a maximum allowable waterline length of 87.08 feet. The J Class existed for just a short time, 1930 to 1937, and only 10 J Class yachts were built, with Endeavour, Shamrock V and Velsheda the only originals to survive terminal neglect or the scrap yard.
As part of its ongoing efforts to promote the class, the J Class Association announced not long ago that it will allow newly constructed J Class yachts to be members and race, provided they use original pre-1939 lines plans. The association also will allow aluminum hull construction and will race under a handicap system.
During the 1930s, it was found that the longest-waterline boats were the fastest. Both Ranger and Endeavour II were built to the maximum waterline length of 87 feet. In addition to the 10 J boats built, there are pre-1939 lines for eight additional hulls, all of which have 87-foot waterlines. Of the eight, Sparkman &Stephens owns the designs to seven, thanks largely to the model-testing program the firm undertook with Starling Burgess during the development of Ranger.
The models were named 77-A, 77-B, 77-C... "77" was the Sparkman &Stephens' design number. Today S&S is working on design number 2734. While the models all had 87 foot waterlines, they had different beams, displacements, longitudinal centers of buoyancy, prismatic coefficients and wetted areas.
As with modern America's Cup yachts, the J Class designs were optimized for venue-specific sailing conditions. The final lines for Ranger were derived from model 77-C which was believed to be the best suited for racing in Newport where summer winds are light and seas relatively small. Ranger's lines were modified though from the model lines, most noticeably in the bow. The model 77-C did not have the "hooked bow" found on Ranger.
The other lines in the S&S model series performed better in different wind and sea conditions. S&S has digitized all of the model lines and has been making new performance studies and comparisons using modern velocity prediction computer programs and comparing these results to the original model test results.
Our studies show that all of the models lines will provide fast boats, but the differences offer potential customers the ability to select the lines that best meet their performance and other requirements. All of the boats we've analyzed probably could have beat Endeavour II as Ranger did. We want people to know that if they're interested in the class, we have viable, competitive plans for them that will allow them many years of fantastic racing and cruising in these magnificent sailing machines.

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