|Engines||1*480hp M-22||1*420/525hp Gnome-Rhone Jupiter-VI|
|Wing Load (kg/m2)||60||69|
|Power load (kg/hp)||2.97||3.25 (2.59)|
|Speed at 0m||220km/h||253km/h|
|Speed at 3000m||231km/h||245km/h|
|Takeoff Roll||90m 7sec||-|
|Landing Roll||210m 19sec||-|
|Bombs||4 small bombs under lower 'wing'|
Sesquiplane single-seat fighter. I-4 differed from ANT-5 by redesigned (to decrease drag) engine howling, and increased tailfin. Quality of production aircraft suffered even more than the pre-production models. I-4 could not be considered among the World advanced fighters any longer. It became obvious that fighter skin has to be smooth, and strut/wing joint have to be covered with fairings, as well as the wheels.
Nonetheless, I-4 was in production during 1927- 1932 and in service with airforce during 1928- 1933. Some I-4s were rebuilt (in 1933) to serve as a parasite fighters for V.S.Vakhmistrov Zveno experiments. Lower wing was cropped to 0.5m (each half) to make takeoff from TB-1. Aircraft handling became more demanding.
Several attempts were taken to increase firepower of the I-4. Preliminary tests were performed with additional machineguns on the upper wing, but those even did not enter trials. In December 1931 pair of recoilless cannons (76mm DRP) were installed under the upper wing, far of the propeller arch. Despite an accident with an explosion of one DRP, trials continued until 1933.
In 1932 GDL (under the VVS order) started evaluation of liquid fuel rocket booster for the fighter. Project head - V.P.Glushko. Two ORM-52 rocket engine under the lower wing, providing 300kg thrust during 60sec.
In 1935 AGOS performed trials with rocket boosters, installed on the upper wing. Six solid-state rockets (5kg each, including 1.3kg of a powder) were installed in arrays of 3. Burning time was 2.5sec, providing at the beginning of trials 250kg of thrust each. During those experiments thrust was increased to 450...500kg per rocket. Later those tests continued on the I-15 airframe.
The I-4 was the first mass built Soviet all-metal fighter;
369 were built.
|Created January 2, 1997
Modified December 27, 1998;