The Bell P-39 �Airacobra� was among the principal fighter aircraft in service with American forces at the start of World War II. It absolutely was build by the Bell Aircraft Corporation Maiden journey April 1939. The aircraft's unusual design showcased its Allison motor mounted in the middle of the fuselage, simply behind the pilot, driving the propeller through a driveshaft passing between the pilot's legs. a 37 mm T9 cannon firing through center associated with propeller hub. Entry toward cockpit ended up being through a side door.Total 9,584 instance were produced, with over half being sent to the Soviet Union under the lend-lease program.