The British Challenger, Endeavour II, owned by British aviation magnate, Sir T.O.M. Sopwith,was designed by Nicholson again and built at the Camper & Nicholson yard. She too was steel, but flush-plated above and below the waterline. Sopwith towed her and Endeavour, plus an entourage of 100, to America where he worked on tuning her rig.

With 5 J-Class yachts (Endeavour I & II and the American defenders) dueling off Newport in preparation for the America's Cup Race the 1937 Cup season must have provided awesome sights for sailors and "land-lubbers" alike.

Sadly, Endeavour was no match for "Super J" Ranger which saw off the competition, easily winning four races, and dashing British hopes once again.