Technical data
Type ANT-5 I-4 Dubler I-4 Pre- series
Function Prototypes Pre- series
Year 1927 1928 1928
Crew 1 1 1
Engine Gnome-Rhone Jupiter-VI M-22
Power (hp) 420/525 480
Size (m)
Length 7.28
Wingspan 11.4
Wing area (m2) 23.8
Weights (kg) and Loads
Empty 921 941 974
Loaded 1343 1363 1426
Wing Load (kg/m2) 56.5 57.3 60.0
Power load (kg/hp) 3.25 3.05 2.97
Speed (km/h)
at 0m 246 257 247
at 3000m 250 250 ?
Roll (m [sec])
Takeoff 70 [6] 70 [6] [8]
Landing 140 [17] 140 [17] [19]
Maneuverability
Turn time - 11sec 12sec
Range and Endurance
Range - 840km -
Flight Endurance 2h18min
Ceiling (m)
Max. 8200 7650 7120
Climb (min)
1000m - 1.8
2000m - 4.1
3000m - 6.7>
5000m 11.4 11.0 12.4
Payload
Fuel+Oil 236+25kg
Armament
Guns 2*mg7.62mm

ANT-5 prototype and pre-production I-4 by P.O.Sukhoj/ A.N.Tupolev

44k b/w "History of aircraft construction in the USSR", Vol.1 p.367

All-metal sesquiplane fighter, with small cantilever lower wing. The order for this fighter was issued in Fall 1925 by TsAGI. Comparison of all-metal vs mixed vs wooden construction fighter was the key idea. General construction of the ANT-5 was similar to this of ANT-2 and ANT-3/R-3. Prototype had to be powered by single 420/525hp Jupiter-VI, which has to be replaced by more powerful domestic M-22 on series aircraft.

Aircraft was designed by P.O.Sukhoj team and rolled out in July 1927. After factory trials ANT-5 was transferred to NII VVS.

In August 1928 it was followed by I-4 'Dubler' ('The Second'). Flights by M.M.Gromov, A.F.Anisimov, A.B.Yumashev and I.F.Kazlov revealed excellent performance of the aircraft, making I-4 one of the best fighters for late 20's. Series production was approved as early as December 1928.

Pre-production ('golovnoj') I-4 was ready on October 15, 1928. It was heavier than prototypes and had somewhat worser assembly quality, but still could be qualified to be among the best. Series aircraft (see I-4) had even worser quality. Corrugated skin was an obvious drawback, as well as luck of airdynamic refinement.

PredecessorModifications

ANT-3/R-3

I-4

I-4bis

References
  • "History of aircraft construction in the USSR", Vol.1 p.366-367;
  • Links
  • ANT-5 / I-4 at the Virtual Aircraft Museum
  • ANT-5, Tupolev
  • I-4, Tupolev

  • Modified March 03, 1998 Back to
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