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" by V.B.Shavrov, Vol.1 p.354

A
fter 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 on 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.
Predecessor(s)
IL-400a
IL-400b		 IL-3
References:
  • "History of aircraft construction in the USSR" by V.B.Shavrov, Vol.1 p.354-355;
    More Links...
  • I-1 at Virtual Aircraft Museum
  • IL-400, Polikarpov
    		• 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 75.0kg/m2
    Power load 3.7kg/hp
    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
    Climb
    1000m 1.9min
    2000m 4.0min
    3000m 6.5min
    4000m 9.0min
    5000m 16.0min
    Modified December 2, 1997
    by Alexandre Savine;    		 Back to
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