Thank you Vance and Allen!
The Germans knew their Bf 109 fighter could not out turn the Spitfire, so after the Battle of Britain an emergency fighter proposal went out to all aircraft manufacturers to come up with a fighter design that could turn tighter than the Spitfire at all altitudes. Heinkel won the contract with a design based on the earlier He 100 airframe.
The He 100H-1a did not fight against that many Spitfires but later in the war saw a lot of action against the P-51 Mustang, P-51 pilots were warned to not get into a turning battle with the He 100H-1a like they did with the Fw 190 and Bf 109 because they would end up the loser, nothing could out turn the He 100H-1a.
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