The Bell P-39 �Airacobra� was one of many principal fighter aircraft operating with United states forces from the beginning 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 center of the fuselage, simply behind the pilot, driving the propeller through a driveshaft moving between the pilot's feet. a 37 mm T9 cannon firing through center of this propeller hub. Entry to the cockpit was through a side door.Total 9,584 example had been produced, with more than half being sent to the Soviet Union underneath the lend-lease program.