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K-5

During the first five-year period, the K-5 was one of the most popular passenger aircraft in the country , designed in 1929 by a team headed by KA Kalinin. Cheap in production, it was produced commercially. The plant has built more than 250 cars of this type. K-5 was operated on the lines of civil aviation until 1940. The plane could take off and land at small airfields (landing speed of 75-80 km / h, run and run about 200 m), was economical, easy to pilot.

In 1926, prior to the development of the K-4, Kalinin began designing a larger airliner - for 10 - 12 passengers. However, production problems are not allowed to deal with this project seriously. Only in October of the next year, the aircraft factory Ukrvozduhputi received a task for such a machine. The airliner was included in the five-year plan of an experienced aircraft building, along with the first Tupolev ANT-9 airliner. Under the scheme K-5 , a high-winged strut with a wing and an elliptical tail in the plan. Design - mixed. The frame of the fuselage and tail tail are welded from steel pipes, the wing frame (area 66 m2) is wooden. Sheathing is everywhere linen.

The first 100 K-5s were produced with a 450-horsepower M-15 radial engine of air cooling. and M-22 480 hp Then they were replaced by 500/730 hp M-17-F engines. The weight of an empty aircraft - 2400 kg (with M-22), take-off - 3600 kg. Depending on the flight range, the K-5 took on board 6 or 8 passengers with luggage or 500540 kg of cargo. The maximum airspeed with the M 22 reached 185 km / h, with the M-17 exceeded 200 km / h. The ceiling was 4450 m and 5040 m respectively.

The prototype was ready by mid-autumn 1929. The first flight took place on October 18. The aircraft was lifted into the air by the pilot M.A. Snegirev and flight engineer P.N. Vlasov. Kalinin himself flew as the third crew member. It happened at the Kharkov Sokolniki airfield. The plane turned out to be easy to drive, and it was good at steering. May 30, 1930 K-5 flew to Moscow, where he passed the exam before the state commission. The State Commission has established that the aircraft fully meets the requirements. But the engine is unreliable - frequent breakdowns of the crankshaft and connecting rods, failure of candles, and it should be replaced. Under the new engine - Pratt & Whitney Hornet, created the second experienced aircraft. He was ready only in the spring of 1930, when the engine was finally received. This copy participated in the flight through the cities of Ukraine in May - June 1930.

Upon completion of the tests, mass production and trial operation of the K-5 began on the Moscow-Kharkov line. The same summer, the plane began to fly on the line Kharkov - Mineralnye Vody. Then Kharkov - Baku. The pilots were happy with the aircraft.

On the first production copies there was an M-15 engine. His resource was only a few tens of hours, which was unacceptable for a transport plane. In addition, the motor was unreliable. There were frequent failures in flight, leading to forced landing and disruption of flights. Caused the remark and the design of the aircraft. For these reasons, the Civil Aviation Inspectorate even decided to stop accepting the K-5 and had to complete the revision. Only in May 1932 was it possible to achieve acceptable performance. Production resumed. Until November 1932, several dozen K-5s with an M-15 engine were manufactured. Proof of the reliability of the modified machine was the flight on June 25, 1933 through the Greater Caucasus Mountains - the first in national history, by the way. The flight from Tbilisi to Pyatigorsk was made by one of the planes of the Transcaucasian Directorate of the Civil Air Fleet. The route ran at an altitude of 4500 meters. Travel time was 2 hours and 30 minutes.

Modification K-5
Wingspan, m 20.50
Aircraft length, m 15.87
Airplane height, m 2.89
Wing area, m2 66.00
Weight, kg
empty aircraft 3060
maximum take-off 4030
engine type 1 PD M-17F
Power, hp
takeoff 1 x 730
flight 1 x 500
Maximum speed, km / h 206
Cruising speed, km / h 178
Practical range, km 960 Rate of climb, m / min 61 Practical ceiling, m 5040 Crew, people 2 Payload: 8 passengers or 690 kg of cargo

K-5 K-5 K-5 K-5 K-5

K-5




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