Technical data
Type G-4
Function Artillery spotter
Year 1947
Crew 1
Engines 2*370/500hp AI-26GR
Rotor diameter 2*7.7m
Length ?
Width (with rotors) ?
Empty weight 2364kg
Loaded weight 3002kg
Rotor (disk) load 32.2
Power load (kg/hp) 3.0
Maximum Speed 148km/h
Static Ceiling 2400m
Dynamic Ceiling 2400m???
Range 233km
Seats 1

G-4, OKB-3/MAI I.P.Bratukhin

The G-4 helicopter. 24k b/w photo from the "History of aircraft construction in the USSR" Vol.2, p.436

Equipped with domestic AI-26GR, G-4 was slightly bigger than G-3.

First G-4 was flight-tested in October 1947 by test-pilot M.K.Bajkalov. Helicopter was capable to fly horizontally with one engine shot down, and land safely in autorotation regime. The first prototype did not meet expectations (some calculated parameters were not reached). As a result of incomplete pilot instructions, it was crashed.

The second prototype with improved rotor blade airfoil passed the extended test program without problems. Gliding (autorotation) rate was 12m/sec, with gliding angle ~16°. In this case landing speed was 80-90km/h with 10-15m roll.

Powerplant and rotors passed 100 hours resource test (performed for the first time on helicopter in the USSR).

G-4 and two G-3 participated in Aviation Parade in 1947.

Small series of G-4 were built;

Predecessor: G-3;
Modifications: B-5

  • [6], Vol.2 p.436;
  • G-4

  • Modified March 28, 1997 Back to
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