M2-F1
In 1962, FRC Director Paul Bikle approved a program to build a lightweight, unpowered lifting body as a prototype to flight test the wingless concept. It would look like a "flying bathtub," and was designated the M2-F1. Built by sailplane designer Gus Briegleb, it featured a plywood shell placed over a tubular steel frame.
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https://www.nasa.gov/image-detail/m2-f1/
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