The Mitchell U-2 Superwing at the National Air and Space Museum features a Cuyuna UL2-11 two-cylinder, 35-hp engine. Its builder, Frank Marsh, first flew the ultralight in 1987 and donated it to ...

The carrier-based U-2 concept was workable, but it never gained much momentum. This article is the second in a two-part series on “Operation Whale Tail,” the CIA’s ambitious project to ...