| 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 15sec |
| Takeoff Roll | 200m 16sec |
| Ceiling | 4700m |
| Climb | |
| 1000m | 5.5min |
| 2000m | 11.9min |
| 3000m | 19.4min |
| 4000m | 29.8min |
| Armament | |
| 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).
| Predecessors | Modifications |
|---|---|
 TB-1/ANT-4 Prototype |
TB-1/ANT-4 Dubler-bis |
| References | Links |
|---|---|
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