The McDonnell Douglas YC 15 first prototype (72 1875), an advanced military STOL transport, made the type’s maiden flight on 26 August 1975. Designed to contend against Boeing YC 14 pro¬totypes for the USAF’s advanced medium short take off and landing transport (AMST) requirement, it had an externally blown flap system that depended on the slipstream from four turbofan engines. The first flight was made three months ahead of schedule and the two YC-15 prototypes flew for three years before the test program ended.
YC-15
Engines: 4 x Pratt & Whitney JT-8D-17, 71.1kN
Max take-off weight: 68000 kg / 149915 lb
Wingspan: 33.6 m / 110 ft 3 in
Length: 37.9 m / 124 ft 4 in
Height: 13.2 m / 43 ft 4 in
Wing area: 161.7 sq.m / 1740.52 sq ft
Max. speed: 805 km/h / 500 mph
Range w/max.fuel: 4800 km / 2983 miles
Crew: 2-3
All Aero 