IP-1 (SG-52) – gun fighter

Developing the theme of fighters with rocket-propelled guns dynamo, DP constructor. in G. 1934 g. I have created a new machine PI-1 (gun fighter). Fighter PI-1, received the Air Force designation SP-1 (fighter gun, factory designation DW-52), already marked a qualitatively new level of development of the cannon fighter. In addition to powerful weapons, SP-1 has a number of features, distinguishes it from other domestic high-speed fighter. It took the form of a wing, in terms of near-elliptical. wing design consisted of a tubular spars and ribs, and stringers, supporting lining, there was very little.

Photo IP-1

It was originally performed retractable landing gear SP-1, summer with wheels, and winter skiing. A successful solution of cleaning problems in flight ski landing gear was found DP. Grigorovich for the first time in our country. This aircraft designers have used a range of measures, sometimes unconventional, aimed at achieving a high flying fighter qualities.

State tests IP-1 aircraft ended in March 1935 g. In tests it has shown high speed, good maneuverability, but it turned out to be the average rate of climb. Fighter armament was to consist of two machine guns ShKAS and APK-11 two guns, which existed only in test samples. Launched into production in Kharkov fighters SP-1 began to arrive at the airport. There they obletyvali and stripped at parking lot in hopes of, that the weapons designer LV. Kurchevsky will start production of its guns. But as time passed, guns and the release of detained. management spetsrabot, which led Kurchevsky, in February 1936 g. rasformirovali. Grigorovich was given the task to urgently prepare a version of the IP-1 with two guns ShVAK. With such weapons, SP-1 fighter production was impractical, because of flying qualities he yielded more light fighter I-16 with the same weapons.

While on the firing range Lyubertsy passed combat tests IP-1. Due to the poor performance rudders aircraft dumped into a flat spin. This defect was seen even during the state tests. Test pilot AI ~ Nikashin, hold them, once I went into a flat spin, and I could not pull out the car and at the last moment left her, using parachute. It was necessary to urgently eliminate design flaws in the Kharkov plant. At that time, the chief designer was the IG plant. Neman, and which is assigned improved properties IP-1. Between him and Grigorovich disputes arose around the state on the horizontal tail plane. Grigorovich suggested to leave feathering on the same height, I supported him and AN. Tupolev. Therefore, in the TsAGI A professor. Zhuravchenko has studied IP-1 model corkscrew with various provisions of feathers. As a result, in January 1937 g. Test left the plane with a low-feathers, ie. on the calculation of IG. Nemana. With such plumage aircraft has been tested and easy way out of any corkscrew.

Total factory built and handed over to the side 90 aircraft SP-1. The troops pilots to the car is treated with respect. Once the pilots, piloted fighter SP-1, there was a curious case. During military exercises during landing pilot A. Svetlov has not released the chassis. In place of PE left irate commander of the unit and. Kalinin, also on the IP-1. He sat down next to Svetlov plane and also forgot to release the chassis. Fighter IP-1 was the last plane, built DP. Grigorovichem, at 1938 g. He died from the disease.

Performance characteristics of the SP-1

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