Tupolev aircraft Mi-3. A photo. History. Characteristics.
Between the First and Second World Wars actively took up the realization of the idea of multi-seat fighter. It was intended as a bomber escort over long distances, as well as an apparatus to carry out strategic reconnaissance and bombing enemy small bombs.
Soviet military has captured a scout P-6, and the emergence of modifications Cr-6 made relevant prerequisites for the development of new, more high-speed fighter Mi-3. The study engaged in ECOSOC TsAGI, originally the project was called ANT-21. In particular, the tasks for the new machine was to develop a cruising speed of up to 300-350 km / h and lifting to a height of m 5000 10 minutes. Fighter planned to equip six machine guns caliber 7,62 mm.
Design Mi-3, which was composed of domestic power plant engines M-34, began in March 1932 In its design ideas and solutions have been introduced, such as retracting the chassis engine nacelles and fuselage arrangement of the type semi-monocoque with a smooth skin. Changes are not touched the wing structure: truss spars and ribs have corrugated paneling. For the sake of expanding sectors of fire applied dvuhkilevoe empennage.
Armature on the Mi-3 was located as follows. Nasal mobile unit took a pair of machine guns and YES PV, stationary machine guns were placed one by one in the center section of the wing. rear hemisphere protection is provided by a machine-gun and knife-installation. However, defensive weapons to experienced version of the aircraft was never established.
In May 1933, the test pilot IF Kozlov made its first flight on the prototype of the Mi-3. This is the first raising of the air of the Soviet aircraft with retractable landing gear. Unfortunately, the car was not perfect, and during the flight went out all sorts of flaws: sometimes brings down the vibration of feathers, sometimes there were failures in the flight control system and the aircraft kosilo wing.
After the observations and recommendations of the pilots KK Popov and BL Buchholz began modifying aircraft. Primarily increased wing area from the 52 59 to m2and equipped fighter landing flaps. Next, change plumage. Added wing fairings and close-fitting corrugated duralumin several lowered the drag coefficient, but it was not possible to eliminate the vibration completely.
In September, the Mi-1933 3 plane, driven I.F.Kozlov, due to the destruction of the steering control rotary attachment points, crashed.
As the commission of inquiry revealed, in the process of development is not taken into account the dynamic loads on the airplane, they exceeded the allowable values of the time. Therefore, once again I had to send the car to the revision, which was delayed until 1934
Understudy, called Mi-3D, was released in January 1934, he was significantly different from its predecessor. The tail unit made odnokilevym. The structure installed adjustable stabilizer having a lifting screw mechanism. Cockpit equipped with a sliding canopy.
The changes were made and weapons. Lower knife-setting (two machine guns with ammunition YES 1000 cartridges) has been installed on top of the middle part of the fuselage. ShKAS machine guns, which were placed in the rear, made such as that the bomber Council. The nose of the gun placed "Oerlikon", and in the center section were two PX-1 1000 with ammunition cartridges.
Stand-Mi-3D had advanced powerplant. It is composed of engines M-34N supercharged. Radiators tunnel, sloping, were blowing air through the chassis fairings.
State tests understudy began in 1934 was put at the helm of an experienced test pilot Mikhail Alekseev. During the flight it observed that the transverse and longitudinal stability are close to neutral parameters. However, there were drawbacks. In particular seen large load on the wheel and the lack of strength of the wing.
Browse down from the bow cockpit was, frankly, a bad. In general, state testing machine understudy could not stand it, too much is not in line with the needs of the customer.
In the future, the experience of the development of the Mi-3 was applied during the design of high-speed SB bombers and fighter aircraft ANT-29.
Airplane Mi-3 characteristics:
|Wing area, m2||59.18|
|engine's type||2 PD M-34N|
|Power, hp||X 2 830|
|Maximum speed km / h|
|near the ground||326|
|Practical range, km||1120|
|Rate of climb, m / min||417|
|Practical ceiling, m||9000|
|Armament:||six 7.62- mm machine gun (gun 2 mobile PV were placed in the nose fuselage installation, fixed machine gun 2 PV - in the wing roots, in 1 mobile machine gun type PV or YES average had lower dorsal and "knife" installation)|
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