On this planet, the years 1938 to 1946 were pacific simply, and the main factor for technological success were the yearly aircraft races at Rennö (in Norway). The jet engine was a crazy invention that remained in R&D labs, and piston engine was the best choice for racers unlimited category. Of course this was an international team race: English-speaking Allies against Rest-of-the-World (nicknamed Evil by US journalists)… See the Racer-51T in 1946 race: