RANGER has been conceived with the objective to design a maximum size J Yacht under the Universal Rule with a waterline length of 87 foot, moderate beam and considerable ballasting the forefoot to improve stability. With little time available, 8 designs had models completed , together with models of ENDEAVOUR I and RAINBOW, the previous competitor yachts. These were the first really scientific tank testing program, where accurate measurements could be taken and clear determination of performance greed. Design 77C created by the very young but innovative designer Starling Burgess clearly showed superiority on most points of sailing over all the others tested, particularly in low wind speeds. However, because of its radical lines and looks, it would never have been except for the proven results. Built from high grade steel - flushed rivet plating, RANGER was launched on 11th May 1937, with very little time to work up to the trial races for defense of the Cup. RANGER went on to prove conclusively that she was the fastest of all the American yachts, winning almost every race in the Defender work up series and Defender selection series. THE AMERICA'S CUP 1937 There were two important changes for this Cup series. Firstly the rules were changed to allow for masts to be heavier by ratio in the larger J Class yachts. This enabled new masts to be built stronger than ever before. Secondly, it was possible to announce the Challenger and Defender yacht up to 30 days prior to the Regatta. This enabled the British challenge to bring with them both ENDEAVOUR I AND ENDEAVOUR II to the USA and work up the yachts together, finally declaring ENDEAVOUR II as the Challenger. RANGER went on to win four races (out of a possible seven) conclusively against ENDEAVOUR II