IP-1
Country of origin
Soviet Union
ManufacturerKhAZ
The Grigorovich IP-1 (for Истребитель Пушечный - "Cannon fighter") was a fighter aircraft produced in the Soviet Union in the 1930s by the Grigorovich Design Bureau.
The IP-1 started development as the GD-52 in 1934. An all-metal aircraft, it featured an open cockpit, retractable wing wheels, an advanced, nearly-elliptical cantilever wing, and a variable-pitch, metal propeller powered by a 640 hp (477 kW) Wright Cyclone series engine. Retractable skis could be fitted for winter use, a first for any Soviet aircraft. The DG-52 was transferred to the Air Force Research Institute on 12 January, 1935 for testing, and was flown that same day by P.Ya. Fedrovi.
Like the preceding Grigorovich I-Z, the IP-1 prototype was built around the cannon-fighter concept, with two Leonid Kurchevsky-designed APK-4 76.2mm cannons mounted under the wings, each capable of 5 shots before ammunition was depleted. It was also armed with two 7.62mm machine guns. Production aircraft used the licensed copy of the Wright Cyclone, the Shvetsov M-25. After 90 aircraft had been produced and 30 delivered, it became apparent that there were issues with lateral stability and especially spin. On 3 June, 1936 Lieutenant...
The IP-1 started development as the GD-52 in 1934. An all-metal aircraft, it featured an open cockpit, retractable wing wheels, an advanced, nearly-elliptical cantilever wing, and a variable-pitch, metal propeller powered by a 640 hp (477 kW) Wright Cyclone series engine. Retractable skis could be fitted for winter use, a first for any Soviet aircraft. The DG-52 was transferred to the Air Force Research Institute on 12 January, 1935 for testing, and was flown that same day by P.Ya. Fedrovi.
Like the preceding Grigorovich I-Z, the IP-1 prototype was built around the cannon-fighter concept, with two Leonid Kurchevsky-designed APK-4 76.2mm cannons mounted under the wings, each capable of 5 shots before ammunition was depleted. It was also armed with two 7.62mm machine guns. Production aircraft used the licensed copy of the Wright Cyclone, the Shvetsov M-25. After 90 aircraft had been produced and 30 delivered, it became apparent that there were issues with lateral stability and especially spin. On 3 June, 1936 Lieutenant...
