Technical data
Type I-1
Function Fighter
Year 1924
Crew 1
Engines 1*400hp M-5 (Liberty)
Length -
Wingspan 10.8m
Wing area 20.0m2
Empty weight 1112kg
Loaded weight 1510kg
Wing Load (kg/m2) 75.0
Power load (kg/hp) 3.7
Max.Speed at 0m 264km/h
Max.Speed at 3000m 148km/h
Range 650km
Flight Endurance 2.5h
Takeoff Roll 7.0sec
Turn time -
Ceiling 6750m
1000m 1.9min
2000m 4.0min
3000m 6.5min
4000m 9.0min
5000m 16.0min

I-1 N.N.Polikarpov, I.M.Kostkin, A.A.Popov

56k b/w IL-400b prototype from "History of aircraft construction in the USSR", Vol.1 p.354

After tests of IL-400b and IL-3 decision was made to launch aircraft into production under designation I-1. Aircraft built of Zavod-1 (Factory-1) were not all identical. Just first batch of 13 aircraft included 3 subtypes.

All aircraft were tried at NOA, including spin behavior. It was found (according to test-pilot M.M.Gromov) that CoG is still to far behind (44% of the wing chord) of optimal and spin escape can not be considered guaranteed. During those tests he was forced to abandon the aircraft with parachute (first case in the USSR). It took place on June 23, 1927. Other test pilot - A.I.Sharapov - get out of flat spin on minimal altitude by lucky occasion only.

As a result I-1 was considered dangerous to fly and was not accepted for service. It was the end of first series low-wing monoplane in Soviet/Russian history.

30 built.


  • "History of aircraft construction in the USSR", Vol.1 p.354-355;

  • More Links...
  • I-1
  • I-1 at Virtual Aircraft Museum
  • IL-400, Polikarpov

  • Modified December 2, 1997 Back to
    Main Gate