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IP-1 Fighter 1934 Year 1/72 Scale Plastic Model Kit Avis 72015

Theme: Military

Era : 1919-1938

Scale : 1/72

Material : Plastic

Series: Legendary Aircrafts

Recommended Age Range: 12 Years & Up

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IP-1 ("gun fighter 1" or factory designation DG-52 - "Dmitry Grigorovich 52") - the development of the Soviet I-Z fighter designer D. P. Grigorovich, armed with Kurchevsky self-loading dynamo-active (recoilless) aircraft guns, replaced in the series by wing-mounted ShKAS machine guns and the latest automatic 20 mm ShVAK guns. It was built in a small series.
All-metal single cantilever low-wing with semi-retractable landing gear with a tail spike. 477 kW (640 hp) Wright Cyclone F-3 radial engine under NACA type hood. The screw is metal with a variable pitch on the ground. The cockpit is open. The fighter was developed under two large-caliber recoilless guns Kurchevsky caliber 76.2 mm APK-4M. The guns were mounted under the wing, with 5 rounds of ammunition. And they were armed with two machine guns of 7.62 mm caliber. Recommended for mass production to replace its predecessor - I-Z.
The fighter had a retractable landing gear. In winter, the wheels were replaced with skis, which were pulled up to the cleaning sites in flight, which favorably distinguished it from the I-16 in service, the ski chassis of which was not removed, which, in particular, greatly affected the successes in the Winter War and air defense of the beginning of the Great Patriotic War.
Already during the production of the first series at the plant number 135 in Kharkov, during tests at the Air Force Research Institute, it was found that the prototype “does not want” to get out of the spin. To eliminate the drawback, a constructive change was made: the pilot's headrest was extended to the keel, forming a long forkil at the level of the horizontal tail. However, a study by a TsAGI spin specialist, Professor A. N. Zhuravchenko, led to the conclusion that this alteration rather worsened the situation, as it made the tail heavier, and the reason for poor controllability was the centering shifted back, reaching 30.1% of the average aerodynamic chord (MAR) of the wing. Which, nevertheless, was considered correct in those years, because the centering of the rival I-16 is even further. The controllability and powerful wing armament worsened, because the first series of fighters surrendered to the Air Force with only two machine guns. Zhuravchenko's recommendations, apparently, did not have time to implement in production. Kurchevsky's guns were not ready, and the first series was armed with two ShKAS wing machine guns. Instead of guns, they began to install four more ShKAS under the wing, but this worsened controllability.
In addition, the Kurchevsky guns were not ready and the first series was armed with two additional ShKAS wing machine guns instead.
In the series, the American engine was replaced by a licensed M-25, the tail skid was replaced by a wheel. Each cannon of the Kurchevsky APK-4M in the series was replaced with a ShVAK cannon or 2 ShKAS machine guns under the wing. This firepower made it possible to use the aircraft as an attack aircraft, which was considered by the Air Force in 1940.
Serial plant No. 135 in Kharkov delivered 31 aircraft in 1936, and another 59 in 1937.
The IP-1 was Grigorovich's last aircraft. The cessation of its improvement, and soon production, was connected with the famous repressions of the country's leadership in 1937, the arrest of the Air Force leadership and, in particular, A. N. Tupolev, to whose position Grigorovich was unexpectedly transferred. Soon D. P. Grigorovich fell seriously ill and died in the summer of 1938, 55 years old.