Caproni Campini N.1 - Wikipedia, the free encyclopedia This thing might look like a jet aircraft, but it's not. It's powered by a motorjet, which - well, wiki tells the story: At the heart the motorjet is an ordinary piston engine (hence, the term motor), but instead of (or sometimes, as well as) driving a propeller, it drives a compressor. The compressed air is channeled into a combustion chamber, where fuel is injected and ignited. The high temperatures generated by the combustion cause the gases in the chamber to expand and escape at high velocity from the exhaust, creating a thermal reactive force that provides useful thrust. Motorjet - Wikipedia, the free encyclopedia Was this mode of propulsion doomed to be a technological dead end from day one, or could it ever have found a useful niche?