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Was the P-47 no longer needed in the role as a high altitude fighter? I guess if it is no longer needed in that role then make it a fighter bomber.
P-47s deployed in Europe never had a range comparable to P-51. When the latter was deployed, more P-47s were available for fighter bomber roles. P-40 was obsolete as a fighter and it was equipped with liquid cooled engine, more prone to damage.
I thought the P-47's were being used on the first leg of escorts even after the P-51 was available. Maybe they had more than enough.
P-40s were used extensively for ground attack well into 1943.
By 1944 there were plenty of P-47s available. The newer aircraft had a larger airframe and more powerful engine which allowed a greater payload to be carried.
The P-40 was good in it's day but that day was over by 1944.
If a Griffon was going into anything from the US, it would have been into a P-51. That would have been fun....
Putting a larger engine in an obsolete airplane is not going to make it equal to other aircraft. A Griffon in a P-40 would not put it in the same class or capability as the Mk.XIV Spitfire, nor the Dora-9.
I am no specialist but I can`t see any design features that cannot be rectified to make the P-40 competitive . And what makes an airplane obsolete?
The P-40 was never able to show its true potential having engines that are weaker than those of its counterparts.
Of course its design was not up to par with the laminar flow wing equipped P-51 which had an engine which could not compete with Spits and Doras performance wise yet made it almost equal as a fighter to them. So a Griffon powered P-51 would be on top and took the place the P-40 might occupied if one does not count the superior range and speed in.
That makes the Spitfire the prime contestant.
The P-40 had bad luck that the niche it could have fulfilled was already taken by other designs that were given the best (better) engines possible.
Maybe it is that over the years the reputation of the P-40 being obsolete grew to common believe.
I am convinced that if given the right engine and more chance of development it would have been equal to the others.