Faced with invasion in 1939 and desperately short of fighters, the Royal Air Force asked North American Aviation to quickly produce the existing but obsolete P-40 Warhawk. Instead, the company designed, built and flew a new airplane in just 117 days: the Mustang.

Using an existing Allison engine and the latest laminar-flow wing, the new fighter immediately went into service with the RAF. In December 1941 the United States joined the war, and it too needed good fighters fast. So the U.S. Air Corps took the basic RAF Mustang, rearmed it with four machine guns, and added an upgraded engine. It was a good performer, but couldn’t operate well alongside the high-flying long-range bombers.

By 1944 the aircraft used the Rolls-Royce Merlin engine, adopted a new bubble cockpit and increased its firepower to six .50 machine guns. It was now the best fighter in the war and fought superbly in all theaters as fighter, fighter-bomber, and reconnaissance platform. It was loved by its aircrews, and no fewer than 281 Mustang pilots became aces, each shooting down at least five enemy aircraft.

-Aircraft of the World(book)

Requested by refdnv1, BLOODIUS, and PilotRoazille

Suggestions are welcome!(Except aircraft that would be made with 2-7 parts or over 500 parts.)
Next aircraft: bf-109

No AGs

Takeoff with flaps 50% down
Aircraft will pitch down when speed is less than 250 mph

oh, yeah, here’s one using the beta stuff like glass