When I read “Sikorsky, Lockheed Design Tailsitter for VTOL X-Plane” (AW&ST Dec. 23, 2013, p. 11), I wondered whether Lockheed remembers its history. In the early 1950s, both Lockheed (XFV Salmon) and Convair (XFY Pogo) built vertical-takeoff-and-landing (VTOL) turboprop prototypes for the U.S. Navy. Only the Pogo had enough spare horsepower (and a very brave pilot) to attempt VTOL flight-testing. Taking off vertically was the easy part. Landing vertically (backward) with a foward-facing ...

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