هواپیمای تحقیقاتی نظامی عمود پرواز DOAK 16

The DOAK Model 16 was the first vertical take-off and landing (VTOL) aircraft to demonstrate the tilt duct concept successfully. It was first proposed in the early 1950s by Doak Aircraft Company of Torrance, California, and in 1956, the US Army Transportation Research and Engineering Command purchased one, and designated it the VZ-4DA. The DOAK had ducted propellers on the wing tips which rotated 90 degrees. The pilot rotated the propeller ducts to a vertical position for take-off and then returned them

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