Polikarpov I-3
| Polikarpov I-3 | |
|---|---|
|
|
| Type: | Fighter plane |
| Design country: | |
| Manufacturer: | |
| First flight: |
May 4, 1928 |
| Production time: |
1929-19 ?? |
| Number of pieces: |
399 |
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The Polikarpow I-3 ( Russian Поликарпов И-3 ) is a single-seat biplane - fighter . It was created in the second half of the 1920s and 399 copies were produced and used by the Soviet armed forces.
history
Nikolai Polikarpow used the two-seater DI-1 fighter as the initial model for this construction , the testing of which was interrupted and not resumed by a crash caused by the lack of strength in the cell.
The I-3 was equipped with an in- line engine, in contrast to the parallel development I-4 by Pawel Suchoi , which received a radial engine . These two types of engine were used to find out which property was more important in a fighter aircraft. Polikarpov's construction therefore had a high speed due to the drive, while Suchois I-4 achieved better maneuverability.
The dummy of the machine was completed on May 14, 1927, the first flight of the prototype followed a year later on May 4, 1928. Since the tests went without incident and the type was maneuverable and easy to fly, preparations were made for series production in 1929 started. The I-3 served in the first line for five years and was then handed over to the school units.
technical description
The I-3 had a fuselage made of pine wood with plywood planking in a shell construction with an oval cross-section. The wings had two box-shaped main spars with plywood ribs. The tail unit consisted of a fabric-covered duralumin frame. The rigid main landing gear was provided with rubber buffering and could be replaced by snow runners in winter. There was a grinding spur at the stern.
While the first series machines of the I-3 were still equipped with English Vickers machine guns and German BMW VIz engines, the later models were equipped with PW-1 -MG and M-17 licensed engines.
Technical specifications
| Parameter | Data |
|---|---|
| Constructor (s) | Nikolai Polikarpov |
| Year of construction (s) | 1928-? |
| crew | 1 |
| length | 8.08 m |
| Wingspan | above 11.08 m below 9.00 m |
| height | 4.10 m |
| Wing area | 27.85 m² |
| drive | a liquid-cooled twelve-cylinder - V-engine M-17 |
| power | 500 PS (approx. 370 kW) |
| Top speed | 252 km / h at an altitude of 5,000 m |
| Landing speed | 100 km / h |
| Rise time | 1.8 min at 1000 m altitude 6 min at 3000 m altitude |
| Service ceiling | 7200 m |
| Flight duration | 2 h |
| Range | 585 km |
| Duration of a full curve | 14 s |
| Preparation mass | 1400 kg |
| Takeoff mass | 1846 kg |
| Taxiway | 150 m at take-off 250 m at landing |
| Armament | two synchronized 7.62mm machine guns PW-1 above the engine |
literature
- Wilfried Copenhagen : Soviet fighters . Transpress, Berlin 1985, p. 104/105 (VLN: 162-925 / 145/85).
- Wadim B. Schawrow : Airplane constructions in the years of socialist industrialization (3) . In: Wolfgang Sellenthin (Ed.): Fliegerkalender der DDR 1981 . Military Publishing House of the GDR , Berlin 1980, p. 183-185 .
