Claim: The "motorjet" that Uno Campini developed to propel the C.C.4 is substantially different from the jet engines of today and his engine used a conventional piston engine to compress air.
Evidence: The Caproni Campini N.1, also known as the C.C.2, was an experimental jet aircraft built in the 1930s by Italian aircraft manufacturer Caproni. The engine of the N.1 featured a radical design, differing substantially from the later-produced turbojet and turbofan engines.