The Caproni Stipa was a bizarre design, built in 1932 to test the thrust effect of a tubular fuselage. The 120 Hp. DH Gipsy III yielded a top speed of 81 Mph, and the lift effect of the tube made the landing speed 42 Mph. A sort of ancestor to modern ducted-fan designs, it faded quickly into a well-deserved and much-appreciated oblivion.