P-40M, version generally similar to the P-40K, with a stretched fuselage like the P-40L and powered by an Allison V-1710-81 engine giving better performance at altitude (compared to previous Allison versions). It had some detail improvements and it was characterized by two small air scoops just before the exhaust pipes. Most of them were supplied to Allied countries (mainly UK and USSR), while some others remained in the USA for advanced training. It was also supplied to the Commonwealth air forces as the Kittyhawk Mk. III.
~~P-40N (manufactured 1943–44), the final production model. The P-40N featured a stretched rear fuselage to counter the torque of the larger, late-war Allison engine, and the rear deck of the cockpit behind the pilot was cut down at a moderate slant to improve rearward visibility. A great deal of work was also done to try and eliminate excess weight to improve the Warhawk's climb rate. Early N production blocks dropped a .50 in (12.7 mm) gun from each wing, bringing the total back to four; later production blocks reintroduced it after complaints from units in the field. Supplied to Commonwealth air forces as the Kittyhawk Mk IV. A total of 553 P-40Ns were acquired by the Royal Australian Air Force, making it the variant most commonly used by the RAAF. Subvariants of the P-40N ranged widely in specialization from stripped down four-gun "hot rods" that could reach the highest top speeds of any production variant of the P-40 (up to 380 mph), to overweight types with all the extras intended for fighter-bombing or even training missions. The 15,000th P-40 was an N model decorated with the markings of 28 nations that had employed any of Curtiss-Wright's various aircraft products, not just P-40s. "These spectacular markings gave rise to the erroneous belief that the P-40 series had been used by all 28 countries." Survivors redesignated as ZF-40N in June 1948.
Zes uitvoeringen mogelijk;
- Kittyhawk Mk.IV; RAAF, nr.80 Squadron, Squadron Leader Geoffrey C.Atherton, Halmahera, Indonesia, 1944.
- Kittyhawk Mk.IV; RNZAF, nr.15 Squadron, "Wairarapa Wild Cat" lt.G.B.Fisken, Henderson Field, 1943.
- P-40N; NEI 120th squadron - Merauke, 1944.
- Kittyhawk Mk.IV; RAF nr.112 Squadron, Cutella, Italy, April 1944.
- P-40N; USAAC, major Richard Johnson, 7th Fighter Squadron, 49th Fighter Group, New Guinea, 1944.
- F-40M; Forca Aerea Brasileira, Esquadrilha Azul, March 1954.
