Several experimental mounts existed but never saw serial production. These included the XP-36D with its 2 x 0.50 caliber machine guns in the nose and 4 x 0.30 caliber machine guns in the wings, the XP-36E and up to 8 x 0.30 caliber machine guns and the XP-36F which attempted to fit 2 x 23mm Madsen cannons under the wings. The latter version, while vastly improved in firepower, was dropped from contention for the weight gain of the cannon armament proved detrimental to the P-36 airframe. The XP-37 was given an Allison V-1710 inline piston engine and saw its cockpit moved further aft. The XP-37 was further developed into 13 examples of the YP-37 for testing. The XP-42 (Model 75S) was an experimental model with a specially devised aerodynamic engine cowling.
Export Hawks were known as the Hawk 75. The initial production order for France became Hawk 75A-1 models and were delivered with R-1830-SC-6 radials of 900 horsepower. Armament was 4 x 7.5mm machine guns and approximately 100 were produced. The Hawk 75A-2 were similar though mounting R-1830-SC-G/R-1830-SC3-G radials of 1,050 horsepower and 6 x 7.5mm machine guns. Again some 100 of the type were produced. The Hawk 75A-3 were built in 135 examples and were generally similar to the preceding A-2 models. The Hawk 75A-4 were similar to the A-2 models but delivered with the Wright R-1820-G205A Cyclone radial engine instead. These outputted at 1,200 horsepower and a total of 285 were contracts. Only 81 of these eventually made it to French forces. The Hawk 75 saw combat actions against the German Luftwaffe in the Battle of France and were the first to claim a German air victory. After the Fall of France, surviving French Hawks were flown to Britain to continue the fight.
China produced the Hawk under license and these were noted as the Hawk 75A-5. There were generally similar to the preceding French A-4 models. When production facilities were in danger, manufacture of the aircraft moved to India where they promptly reemerged as the Mohawk IV mark under British control. The Hawk 75A-6 was originally a Norwegian mark but, after the German conquest, these were captured and delivered (sold, not handed over) to allied Finland. Some Luftwaffe pilots were also trained on the type. A tropicalized Hawk version was born in the Hawk 75A-7 mark and destined for the Netherlands East Indies. These fitted 1 x 0.50 caliber heavy machine gun and a 0.30 caliber machine gun in the cowl with up to 4 x 0.30 caliber machine guns in the wings. They were also given provision for the carrying of up to 6 x 50lb bombs and delivered with Wright Cyclone engines of 1,200 horsepower.
Norway was also the recipient of the Hawk 75A-8 and these eventually came to be known under the P-36G designation. They served in the training of Norwegian pilots sent to Canada and completed with R-1820-G205A radials of 1,200 horsepower. G-models eventually found their way to Peru. The Hawk 75A-9 saw combat action with the British in India as were also known as Mohawk IVs. These were originally 10 examples intended for Iran.
A few more "simplified" variants existed for export as the Hawk 75M, Hawk 75N,Hawk 75O and Hawk 75Q. The 75M were produced for and by China with fixed undercarriage systems and Wright R-1820 Cyclone engines. The 75N was delivered to Siam again with a fixed undercarriage. Argentina received the 75O in about 20 examples. The 75Q consisted of two evaluation models for Chinese consideration.
Portugal was another Hawk operator and purchased several despite their neutral position. In March of 1942, the United States delivered 10 P-36A model Hawks to Brazil.
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