 He also worked on the Golden Gate Challenge 12-Meter program for the 1987 America's Cup and designed a high-performance 30-foot, ultralight (2,000-pound) sloop for Ron Moore which featured a winged keel and deck.From 1979 to 1987, Mull chaired the International Technical Committee (ITC) of the Offshore Racing Congress.Mull's last Ranger design was in 1981 with Bangor Punta Yachts where 80 were made in the 26 foot length.