Model Variants (Including Prototypes)
P-36 Hawk - Base Series Designation
Model 75A - Curtiss company prototype used to test aerodynamics and various engine types.
Model 75B - Prototype fitted with Wright R-1820 radial piston engine.
Model 75D - Prototype fitted with Wright Whirlwind R-1670 radial piston engine.
Model 75I - Curtiss designation for P-37 model
Model 75H - Curtiss designation of simplified export models for China and Argentina.
Model 75J - Modified Model 75A fitted with supercharger for evaluation.
Model 75K - Proposed variant; fitted with Pratt & Whitney R-2180 Twin Hornet radial piston engine.
Model 75P - P-40 Prototype; fitted with Allison V-1710 inline piston engine; based on P-36A production model.
Model 75R - Prototype fitted with R-1830-SC2-G turbo-supercharged engine.
Y1P-36 (Model 75E) - USAAC prototype fitted with Pratt & Whitney R-1830 engine.
P-36A (Model 75L) - Initial USAAC production model.
P-36A-3 - Fitted 4 x 7.62mm machine guns in wings; nose armament retained.
P-36B - Modified from P-36A production model; fitted with R-1830-25 radial piston engine of 1,100 horsepower; single example tested and reverted back to P-36A standard.
P-36C - Fitted with R-1830-17 radial piston engine of 1,200 horsepower; additional 7.62mm machine gun added to each wing with corresponding ammunition packs fitted.
XP-36D - Prototype; based on P-36A; 2 x 12.7mm heavy machine guns fitted in engine cowling along with 4 x 7.62mm machine guns in wings.
XP-36E - Prototype; based on P-36A; 4 x 7.62mm machine guns added to wings; original nose armament retained.
XP-36F - Prototype; modified from P-36A production model; fitted with 2 x 23mm Madsen cannons in wings; reverted back to P-36A form after testing.
P-36G - Norwegian export designation; fitted with R-1820-G205A radial piston engine of 1,200 horsepower; operated in training in Canada before being sold to Peru.
Hawk 75 - French export designation
Hawk 75A-1 - Initial French production models; fitted with R-1830-SC-6 radial piston engine of 900 horsepower; 4 x 7.5mm machine guns; 100 examples produced.
Hawk 75A-2 - Fitted with R-1830-SC-G or R-1830-SC3-G of 1,050 horsepower; 6 x 7.5mm machine gun armament; 100 examples produced.
Hawk 75A-3 - Based on Hawk 75A-2; 135 examples produced.
Hawk 75A-4 - Based on Hawk 75A-2; fitted with Wright Cyclone radial piston engine of 1,200 horsepower; 285 examples produced with 81 of these sent to France, the rest to Britain following the Fall of France.
Hawk 75A-5 - Chinese license production variant; based on Hawk 75A-4; models overtaken by RAF.
Hawk 75A-6 - Norwegian export variant; confiscated by Germans after Fall of Norway, sold to allied Finland.
Hawk 75A-7 - Netherlands East Indies export variant; fitted with Cyclone radial piston engine of 1,200 horsepower; 3 x 7.7mm machine gun armament later upgraded to 4 x 7.7mm machine guns and provisions for light bomb load.
Hawk 75A-8 - Norwegian Export Variant; becoming the P-36G.
Hawk 75A-9 - Persian Export Variant; 10 examples delivered and confiscated by RAF; becoming Mohawk IV service marks.
Hawk 75M - Chinese Export Variant simplified with fixed undercarriage; local US and license Chinese production.
Hawk 75N - Siam Export Variant simplified with fixed undercarriage.
Hawk 75O - Argentina Export Variant simplified with fixed undercarriage; 50 examples produced locally in US and in Argentina.
Hawk 75Q - Simplified evaluation models for China; two examples produced.
XP-37 - Prototype fitted with Allison V-1710 inline piston engine; cockpit relocated to rear placement.
YP-37 - Evaluation model of the XP-37 prototype; 13 examples produced.
XP-42 (Model 75S) - Technology demonstrator
H75 - Alternative designation for French export models.
P-36 "Mohawk" - RAF Designation