Kalinin K-4

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Kalinin K-4
Kalinin K-4 over Kharkiv, 1928.jpg
Kalinin K-4 over Kharkov, 1928
Type: Airliner , ambulance aircraft , aerial aircraft
Design country:

Soviet Union 1923Soviet Union Soviet Union

Manufacturer:

Kalinin

First flight:

June 1928

Production time:

1928/1929

Number of pieces:

22nd

The Kalinin K-4 ( Russian Калинин К-4 ) was a single-engine Soviet multi - role aircraft . It was a further development of the K-3 aircraft .

K. A. Kalinin and his staff began development and construction in Kharkov in 1928. Completely technologically revised, but still built in the familiar design of its predecessors, it was a very successful aircraft for the conditions at the time. The tried and tested BMW IV engine was also used in this type .

history

The planning of this aircraft type envisaged a versatile use. So three different variants / versions were built:

  • Execution as a commercial aircraft for the transport of four passengers
  • Designed as a medical aircraft for the transport of four stretchers
  • Execution as an aerial aircraft: The cabin floor received a hinged hatch, above which two aerial cameras were installed, which were operated by two photographers. This version was widely used in Soviet aviation at the time.

A total of 22 copies were built. Due to the insufficient loading capacity, production was discontinued in 1929 in favor of the K-5 .

One model was equipped with a 300 hp M-6 engine in 1928 and was shown at the International Aviation Exhibition (ILA) in Berlin. A record flight of 1000 km from Kharkov via Moscow to Irkutsk and back in 36 hours was undertaken in August 1929 with a K-4 "Chervonnaja Ukraina" (Red Ukraine) aircraft. The pilot was M. A. Snegirev , I. T. Spirin was his observer.

construction

Like its predecessors, the aircraft presented itself as a high-wing or shoulder-wing wing strutted towards the fuselage. More intensive use of the light metal construction in the construction of the fuselage part made it possible to reduce the empty weight. The wheel chassis again had a continuous axle and could also be used with snow runners .

Up to the end of the cabin section, the hull was clad with light metal. The rear part of the fuselage was again covered with fabric, as on the K-3 . Kalinin also used the tubular steel construction for the fuselage and the wing center section on this aircraft. The outer wings were made of wood and covered with fabric.

Technical specifications

Parameter Data (traffic execution)
crew 1
Passengers 4th
length 11.35 m
span 16.75 m
Wing area 40.00 m²
Wing extension 7th
Wing loading 58.8 kg / m²
Power load 9.8 kg / hp
Empty mass 1540 kg
payload 810 kg
Takeoff mass 2350 kg
Engine Liquid-cooled, vertical six-cylinder in-line engine BMW IV
power 176 kW (approx. 240 PS)
Tank volume 320 l
Top speed 174 km / h
Cruising speed 145 km / h
Climb performance 2.4 m / s
Service ceiling 4500 m
Range 1000 km
Take-off / landing runway 270 m / 200 m

literature

  • Wilfried Copenhagen : Lexicon Soviet Aviation. Transpress, Berlin 1986, ISBN 3-344-00005-5 .
  • Heinz A. F. Schmidt: Soviet planes . Transpress, Berlin 1971.
  • Heinz A. F. Schmidt: Historical Airplanes Part II . Motor book, Stuttgart 1970.

Web links

Commons : Kalinin K-4  - Collection of pictures, videos and audio files

Individual evidence

  1. Heinz Machatschek: Personalities of Soviet Aviation (2): Nikolai Kamanin, Michail Snegirjow, Ilja Masuruk . In: Flieger-Jahrbuch 1984 . Transpress, ISSN  0428-5697 , p. 104/105 .