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 N.1 first flew in 1940 and was briefly regarded as the first successful jet-powered aircraft in history, before news emerged of the German Heinkel He 178's first flight a year earlier.
(info from wikipedia).

This plane was build in 1930, but flew on 1940, i just hope it counts for the challenge :)

It uses an type of jet engine called ThermoJet that use an piston engine to move the plane, idk how to explain.

Has an max speed of 280-350 kp/h (pretty realistic) and has terrible climb rate.