Grigorovich designed the IP-2 / DG-54 (Russian: Григорович ИП-2 (ДГ-54)) fighter in the winter of 1935-1936. The IP-2 appeared as a modification of the IP-1 gunship fighter and as main differences it had slightly increased dimensions and a 760 hp Hispano-Suiza 12Ybrs engine. The manufacturing name of the model was DG-54 and in some literature it has been called PI-2 by the acronym P uchechni I sterbitiel or Gunship fighter.
The IP-2 fighter was designed as a single-seater monoplane with a low cantilever wing. In plan view it was similar to the British Supermarine Spitfire.
The IP-2 kept the elliptical wing introduced in the IP-1 and built according to the “Grigorovich wing without stringers” formula. The main difference is that in the case of the IP-2, the builders were forced to install an inverted gull-type wing in order to raise the nose of the device from the ground in the presence of a larger diameter propeller.
The fuselage in this case maintained a construction similar to that of the IP-1, but it featured an elongated nose in order to accommodate the Klimov M-100A engine, a licensed version of the 860 hp Hispano-Suiza 12Ycrs. The tailplanes, elliptical in shape, presented in this version medium implantation and cantilever.
The landing gear maintained the retracting system with the wheels semi-inserted in specially designed fairings and installed at the wing angle change point.
Another new detail in the IP-2 was the closed cockpit for the pilot. This fighter incorporated a powerful armament consisting of a 20 mm ShVAK cannon located in the V of the engine and 4 ShKAS 7.62 mm machine guns located in the wings. This could be increased up to 10 machine guns in the ground attack version. Under the wing, supports were provided to carry up to 40 kg of bombs.
During the first half of 1936 a full-size mock-up was built at Factory No.1 “Aviajim” followed by approval to build an experimental prototype.
The project was completed and in the first half of 1936 a set of parts and components had already been produced, but once again Grigorovich was affected by the restructuring of the Soviet aircraft industry. On May 11, 1936, the Labor and Defense Council (STO) decreed the specialization of aeronautical factories and the linking of builders with the serial production of their models.
In the summer of 1936 Grigorovich’s OKB was closed and he transferred to GUAP as head of the naval department. His group, made up of 25-30 people, was sent to the TsAGI Experimental Construction Factory (ZOK). All the unfinished projects ended up there, including the IP-2 fighter. The ZOK had been intended to specialize in the development of scout aircraft, so all documentation and items produced were sent to Kharkiv Factory No.135, where the IP-1 was produced. A year and a half later, when the production program was redefined for 1936 –1937 the IP-2 was excluded.
Powerplant: 1 × 860 hp Klimov M-100A
Wingspan: 11.00m
Wing area: 20.60 m²
Length: 8.06m
Height: 3.27m
Empty weight: 1430 kg
Take off weight: 1952kg
Wing loading: 94.75 kg/m²
Power load: 2.27 kg/hp
Accommodation: 1
All Aero 