Model Variants (Including Prototypes)
Model 75I - Prototype Base Model derived from XP-37A airframe fitted with Allison 1,150hp V-1710-11 inline engine.
P-40 - United States Army Air Corps production version fitted with V-1710-33 powerplant.
Hawk 81-A1 - Export model for French use.
P-40B - Improved model featuring improved armor and armament with seal-sealing fuel tanks.
P-40C - Additional 2 x 12.7mm machine guns added to wings; improved seal-sealing fuel tanks.
P-40D - Fitted with V-1710-39 generating 1,150hp; increase performance at high altitude; improved supercharger.
P-40E - Only 4 x 12.7mm machine guns in wings.
P-40F - Improved supercharger.
P-40L - Similar to the P-40F with improved supercharger and 1,300hp Packard V-1650-1 (license-built 1,300hp Rolls-Royce Merlin) powerplant.
P-40K - Based on the P-40E model with V-1710-33 powerplant.
P-40M - Fitted with V-1710-71 powerplant.
P-40N - Fitted with V-1710-81 OR V1710-99 OR V1710-115 powerplants; improved performance capabilities; decreased overall weight.
Tomahawk Mk I - Export model for British use.
Tomahawk Mk IIA - British export model of the P-40B.
Tomahawk Mk IIIB - British export model of the P-40C.
Kittyhawk Mk I - British export version of the P-40D.
Kittyhawk Mk IA - British export version of the P-40E with 6 x 12.7mm machine guns in wings.
Kittyhawk Mk II - British export version based on the P-40L with 1,300hp Rolls-Royce Merlin engine.
Kittyhawk Mk III - British export version based on the P-40K.
Kittyhawk Mk IV - British export version based on the P-40N.