| 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
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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.
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