Technical data
Type ANT-4, TB-1 'Dubler' (Second Prototype)
Function Bomber prototype
Year 1928
Crew 3
Engines 2*500/730hp BMW-VI
Length 18.01m
Wingspan 28.7m
Wing area 120.0m2
Empty weight 4172kg
Loaded weight 6800kg
Wing Load (kg/m2) 56.7
Power load (kg/hp) 7.3/5.46
Speed at 0m 198km/h
Landing Speed 85km/h
Landing Roll 250m
Takeoff Roll 200m
Ceiling 4700m
1000m 5.5min
2000m 11.9min
3000m 19.4min
4000m 29.8min
Guns 3*7.62mm 'Luice'
Bombs 730kg inside

TB-1, ANT-4 'dubler' (The Second Prototype) by A.N.Tupolev

Construction of the second prototype (Dubler) of the ANT-4 was finished in February 1928. Flight test started half a year later, due to delays with imported parts (main gear axles from Sweden). State acceptance trials also took a while (August 15, 1928 - March 29, 1929) due to novelty of the design. Aircraft was approved for military service.

ANT-4 'Dubler' carried all necessary equipment (radio, navigation, etc.) and was armed with three 'Luice' machineguns on three turrets. 730kg of bombs could be carried inside the fuselage.

Well before full trial program was fulfilled, preparations for mass production started (second half 1928). At the time Junkers Concession was on the wedge of liquidation, and its facilities (at Fili, Moscow) were transferred to ANT-4 production group (40 people).


TB-1/ANT-4 Prototype
TB-1/ANT-4 Dubler-bis

  • "History of aircraft construction in the USSR", Vol.1 p.372;
  • ANT-4 / TB-1 at the Virtual Aircraft Museum
  • ANT-4, Tupolev
  • TB-1, Tupolev

  • Created April 13, 1998 Back to
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