R2800 weighed between 2,000 and 2400 lbs and produced between 2000 and 2600 hp. I don't know what the BMW engine weighed but one source says "a little over 900kilos" but the BMW had a more complete engine package even including some ducting. In any case, with fuel injection, 14 instead of 18 cyls. and half the oil of the Manly Pratt.... The BMW should be more fragile and more suceptible to fire and oil loss damage. Also, the Pratt was a much smoother engine. The Counter rotating balancers weren't on the 1700 for BMW to copy.
Like DOA, I have read all those comparisson tests and the main point is that they all pretty much agree even though they were done independently. I don't believe that the Germans ever tested a Corsair. One of our squaddies is a renown Historian and Author whose last few books were on the pacific war (Fire in the Sky) and he has interviewed a hundred or so WWII pilots who all echo the comparisson tests when it comes to the 51, Hellcat and Corsair.
What we got in AH is a Corsair that is grosly out accelerated, and outrolled and (LOL) out turned by an A5 of all things. HT and crew admit there there MAY be a thing or two odd about the turn of AH FM's.... An A5 out turns a Corsair in AH.... Yeah, something may be wrong here. I have no idea what the excuse for the roll rate or acceleration is.
Take away the cannon option and you will see less Corsairs than any other plane in AH. fix the AH Corsair turn, acceleration and roll and you will have a very competitive AH ac with unique strengths and weaknesses. Fixing the Corsair is a win/win situation IMO.
lazs