Claim: The "motorjet" that Uno Campini developed to propel the C.C.2 (experimental jet aircraft built in the 1930s) is substantially different from the jet engines of today and his engine used a conventional piston engine to compress air.
Evidence: The "motorjet" that Campini developed to propel the C.C.2 is substantially different from the jet engines of today. Campini's engine used a conventional piston engine to compress air, which was then mixed with fuel and ignited.