Tuesday, August 15, 2017

McDonnell Model 81/81A Helicopter

TitleUntitled 1 McDonnell Model 81/81A assault transport helicopter project proposal. Report No. 1913, dated 20 December 1950. Model 81 was a tandem geared rotor helicopter with a turboprop engine. The Model 81A was a tandem geared rotor helicopter with a reciprocating engine. Note: the Model 82 became the XV-1 Convertiplane. Credit:Greater St. Louis Air and Space Museum.

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