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The Mosquito wasn't smaller than the Beaufighter.
The Griffon wouldn't have been available in sufficient numbers, irrespective of whether it was to be used for other aircraft, when the Beaufighter II was produced.
I don't think the Griffon would have added anything as the Hercules was already producing 1400HP and 1650HP was on the way, and with a better CoG to boot.
That's 1943 though isn't it when Hercules was making 1700+?
Griffons were in the air in 1941 on prototypes such as the Spitfire IV and Firefly, earliest service date I have is October 1942 for Griffon IIB powered Spitfire XII. These engines were rated to 1730 hp. Spitfire XII latter received the 1850hp Griffon IV in 1943.
My thought is that a Griffon powered Beaufighter would have kept the aircraft relevant longer.
All told, not as glamorous as the Mossie, but a critical aircraft early war for the Allies, and which still had a useful role even at wars end.
One of the all time greats which a bit like the Hurricane gets forgotten.
A Griffon Beaufighter might have addressed criticisms of the aircrafts limited speed.
...kept it relevant for longer.
The first production Beaufighter II was delivered in April 1942.
... and if I can remember correctly, one or two of the Strike Wing squadrons that equipped with Mossie torpedo bombers switched back to the Beaufighter because of the Mossie's dislike of a big draggy thing spoiling its lines.
The Mossie didn't like having a torpedo slung underneath it and if I can remember correctly, one or two of the Strike Wing squadrons that equipped with Mossie torpedo bombers switched back to the Beaufighter because of the Mossie's dislike of a big draggy thing spoiling its lines.
The Mossie never flew operationally in the torpedo carrying role. Coastal Command Mossies primarily carried rockets and bombs, with the cannons used as a little extra firepower.