All kidding aside, the Buffalo, much like the F4F, was never going to be a long term answer either off carrier decks or on the ground. Both aircraft were transitional designs,
Neither of them had much room left to develop in the basic airframe. Even with the the R-1830-94, you are left with a 325 MPH fighter with lousy climb rate and limited range
Objection(s):
- in 39/40 the Luftwaffe was still transiting too and even during the BoB the RAF could have benefited from well made Buffalos, if only to show them the 20mm cannonis not the sole sollution to firepower problems.
- the Buffalo and wildcat had a limited range only compared to late war planes like the P-38, -51. Compared to the Me109 or Spitfire both had looong legs. Don´t know about the Fulmar but what do you think is a better carrier fighter, well made F2A(4+.50, 144gal) or a Fulmar?
- it was transitional designs like the Wildcat, P-40 and to a lesser degree the Hurricanes and Hawk that defeated Japanese airpower before the new fighters entered service.
By the way, I was able to solve the Mk 13 torpedo mystery! Remember how we wondered about the max. drop speed of 420 mph in spite of no such fast torpedo bomber? The answer is the SB2C, a dive- and torpedo bomber. Obviously the designers envisaged the pilots to drop the "fish" after going into a high speed dive!
Against G or FW-190? No way. Against F? With a better pilot and adaptive tactics, just maybe. Overall, you're written a very good evaluation where the pics are especially useful. Then again I have to remind you that even in 1943 Allied air forces were flying even worse aircraft, such as Hurricanes and P-40's, extensively.
Errr, Hurricanes were being used as fighter-bombers from mid-41 onwards. In the defence of Malta they were used in the fighter role until mid-42 but only showed the inferiority of the Hurricane to the Me109-F.
By 1943 P-40 in the Med were either the Merlin powered version or fighter-bombers too.
And last but not least I crunched some numbers:
The original armament of the Buffalo were one .30 and one .50 gun. with 600 and 500 rounds per gun that´s 284 pounds. And the plane had no protection at all.
Armour and makeshift fuel tank protection will add 200 to 250 pounds to the plane.
Four .50 guns with 500 rounds each weight 880 lb, so we are talking about an 800 lb weight increase. With makeshift fuel tank protection!! The F2A-3 had two unprotected(!) 80 gal tanks and three self sealing aux. tank that added another 80 gal. and no doubt a lot of weight.