In May, Howe unsuccessfully attempted horizontal to vertical transitions at 5,000 feet; when engines rotated, pitch-up occurred, and as stick was pushed forward to compensate, aerodynamic and reaction control pressures were sufficient to deform aft fuselage. Since major test aims were complete and last J44s had 4.5 hours on them, project was terminated in favor of X-14. ATV weighed about 2,000 pounds and accelerated from 0-100 mph in 100 ft. Was only able to fly well in cold weather (relatively high air density) when engine thrust was about equal to aircraft weight. 6 key test results: successful turbojet VTOL flight with a 1:1 power/ weight ratio; proof that a person could control such an aircraft; simple, workable reaction control system; jet engines operating in sustained vertical and horizontal positions; transitional flight that was more stable than hovering flight; and proof that jets could be operated vertically over concrete surfaces without damaging them. Model 68/X-14 aircraft approved Jun 55. Was based on the Beechcraft Bonanza and T-34 pieces and used vectored thrust instead of tilting engines. X-14 flew successfully 1957-81 until damaged by NASA and retired to Fort Rucker Museum. Sir Stanley Hooker of Hawker gave credit to X-14 data in making P1127/Kestrel/ Harrier successful.