Operational History
The first tethered hover flight took place on 9 January 1963. There were initial problems with hot gas re-ingestion 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 system 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 was the first complete flight from vertical take-off transition to horizontal flight deceleration to vertical flight and vertical landing. After much testing and practise the first public presentation of the Yak-36 was 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.
Read more about this topic: Yakovlev Yak-36
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