Ah, I forgot about P-39 and P-40. Pretty sure Merlin was present in the design from start, or at least consideredin contract if not manufactured from start with

Ah, I forgot about P-39 and P-40. Pretty sure Merlin was present in the design from start, or at least consideredin contract if not manufactured from start with it (I somehow doubt the RAF would have accepted the high altitude performance of Allison engine)