From Wikipedia: The Hughes XF-11 was a prototype military reconnaissance aircraft, designed and flown by Howard Hughes for the United States Army Air Force. The first prototype, tail number 44-70155, piloted by Hughes, crashed on 7 July 1946 while on its maiden flight. An oil leak caused the right-hand propeller controls to lose their effectiveness and the rear propeller subsequently reversed its pitch, disrupting that engine's thrust, which caused the aircraft to yaw hard to the right. Rather than feathering the propeller, Hughes elected to make an emergency landing on the golf course of the Los Angeles Country Club, but about 300 yards short of the course, the aircraft suddenly lost altitude and clipped three houses. The third house was completely destroyed by the fire resulting from the crash and Hughes was nearly killed.