Posted by MarkB_MI on July 12, 2019 at 14:43:15 from (174.230.51.11):
In Reply to: ot, p- 39 posted by ericlb on July 12, 2019 at 11:34:19:
Well, there are a number of reasons, the main one being that Merlins were needed for Mustangs. Since the P-39s were almost all going to the Soviets, there wasn't a lot of motivation to divert Merlins for Airacobras destined for the USSR.
Bell did build a prototype P-63 Kingcobra with a Merlin, but the P-63 ended up going into production with the Allison V-1710 instead.
Understand that the poor high-altitude performance of the P-39 wasn't so much that it was powered by the Allison V-1710 but because the turbocharger was left off due to packaging considerations. If the Bell engineers had figured out how to squeeze the Allison's turbo into the tight Airacobra fuselage without any drag-inducing protrusions, they would have done so and the P-39's altitude performance would have been far better.
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