. . "The NASA M2-F1 was a lightweight, unpowered prototype aircraft, developed to flight test the wingless lifting body concept. It looked like a \"flying bathtub,\" and was designated the M2-F1, the \"M\" referring to \"manned\" and \"F\" referring to \"flight\" version. In 1962, NASA Dryden management approved a program to build a lightweight, unpowered lifting body prototype. It featured a plywood shell placed over a tubular steel frame crafted at Dryden. Construction was completed in 1963."@en . . . "1"^^ . "30000.0"^^ . . . .