The Stipa-Caproni, also known as the Caproni Stipa, was an experimental Italian aircraft designed in 1932 by Luigi Stipa and built by Caproni. It featured a hollow, barrel-shaped fuselage with the engine and propeller completely enclosed by the fuselage—in essence, the whole fuselage was a single ducted fan. Although the Regia Aeronautica (Italian Royal Air Force) was not interested in pursuing development of the Stipa-Caproni, its design influenced the development of jet propulsion.

Oh, and before you comment “why does it have a jet engine”, or “why does it have a gyroscope”, then here’s the explanation. This thing basically flies like a brick. I used a hollow fuselage for it, and the normal propeller, even the turboprop, cannot lift it off the ground without stalling or crashing. So I had to use a scaled down jet engine with 2x power multiplier to get it to accelerate. Oh, and the gyroscope is for stability. You can turn off AG8 to disable it.