pods, but the Yak-36 had insufficient excess thrust and range for effective use as a combat aircraft. Operational history The first tethered hover flight took place on 9 January 1963. There were initial problems with hot gas reingestion where hot exhaust gasses are sucked back into the intakes causing poor airflow through the engines and loss of thrust. The suction effect of the exhaust on the ground (which made a higher engine power needed) and problems with control systems caused further difficulties. After modifications, the first untethered vertical flight was made on 23 June 1963, followed by the first full transition to horizontal flight on 16 September 1963. On 24 March 1966, the first complete flight was made from vertical takeoff transition to horizontal flight deceleration to vertical flight and vertical landing. After much testing and practice the first public presentation of the Yak-36 was made on 9 July 1967 at an air show at Moscow-Domodedovo airport, marking the 50th Anniversary of the October Revolution. After the promising results obtained from the flight test programme of the Yak-36, the next development step was the Yakovlev Yak-36M which flew for the first time on 27 September 1970. Operators Soviet Air Force Aircraft on display The second Yak-36 prototype, b/n 35, is now on display at the Central Air Force Museum at Monino, outside Moscow, Russia. Specifications (Yak-36) See also References External links The surviving Yak-36 at Monino 1960s Soviet fighter aircraft V/STOL aircraft by thrust vectoring Yak-036 1960s Soviet experimental aircraft Twinjets Aircraft first flown in 1963