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The First flight of a F7F prototype was in Nov/Dec of 1943. The First P-61 Squadron Embarked on ship for transfer to England (after training) in Feb of 1944. Considering that the first flight of a P-61 was about 21 months earlier I think we can see that the F7F was vaporware for combat in Europe.
THe Intial orders for Prototypes were placed back in 1941.
THe F7F simply wasn't as far along in development as the P-61 when the Army ordered the P-61 and production orders for hundreds of both aircraft were signed before the Protoypes even flew.
The first USAAF F.8 Mosquito was delivered to Wright Field, Ohio, on June 1. This was serial number 334928, formerly KB 317, a B. Mark VII model.
1943
Downsview, Ontario,
Although best known for their service with the Royal Air Force, Mosquitoes were also flew in several U.S. Army Air Force units as photographic and weather reconnaissance aircraft and as a night fighter. During the war, the USAAF acquired 40 Canadian Mossies and flew them under the American F-8 (photo reconnaissance) designation. In addition, the British turned over more than 100 Mosquitoes to the USAAF under Reverse Lend-Lease. These aircraft retained their British designations.
by the time it entered service, targets were few and far between.
These same "gentlemen" did purchase Canadian made Mosquito aircraft. Perhaps they could find it in their heart to purchase superior American made F7F aircraft that were originally designed to a USN specification.]
The Me-262 was king of the sky over Germany where it was designed to operate. However I wonder how good the AI radar was as it had to be squeezed into such a small aircraft.
FuG 224 was not the replacement but a smaller Berlin AI or something in the AI form.
As far as using the F7F instead of the P-61, I think that the P-61C with the uprated engines and use of turbochargers and air brake would have at least made it as good as the F7F. The P-61C would at least have a height advantage.
Attached is the manual for the P-61
Carman
the B-1a/U1 even in it's role during 1945 could not compete with the Widow with fuel range the jet was just way too limited even with the twin nose outboard fuel tanks I described.