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Pitcairn XO-61
The Pitcairn XO-61 was an American autogyro designed by Pitcairn Aircraft. One of the last autogyros produced, in competition with the Kellett YO-60 and the Sikorsky R-4, it fell victim to cooling problems with its rear-mounted engine and the coming of the helicopter with its ability to hover.〔Gregg, E. Stuart, ("Above & Beyond: Jump Ship" ). ''Air & Space Smithsonian'', March 2001〕〔Harris, Franklin D. (An Overview of Autogyros and The McDonnell XV-1 Convertiplane ), NASA/CR—2003–212799. NASA Ames Research Center, October 2003〕
Also known by the company model number PA-44 and the contract designation MX-157,〔Cully, George & Andreas Parsch: (MX-1 to MX-499 Listing ), designation-systems.net〕 the contract for the XO-61 was taken over by G&A Aircraft upon G&A's acquisition of Pitcairn Aircraft.〔(Wings of Freedom Winter 2007/2008 ), Volume 22 Number 4, Delaware Valley Historical Aircraft Association.〕
==See also==
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