Kalinin K-3

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Kalinin K-3
Kalinin K-3 L'Aérophile November, 1928.jpg
Type: Ambulance aircraft
Design country:

Soviet Union 1923Soviet Union Soviet Union

Manufacturer:
First flight:

1926

The Kalinin K-3 ( Russian Калинин К-3 ) by the designer Konstantin Kalinin was the first Soviet medical aircraft . Based on the experience with the K-2 , a further development with the BMW IV engine was created based on the same design goals, but with the design elements of the K-1 . In contrast to the K-2, this aircraft was again made in mixed construction, but had its BMW IV with a fixed two-bladed wooden propeller as a drive.

history

In the version as a medical aircraft, either four seated passengers or one seated passenger (accompanying doctor) and two stretchers could be transported in special holders on top of each other. The technical equipment was developed by A. F. Lingart , the father of Soviet medical aviation . There was a large hatch on the port side, which made it possible to load and remove the stretchers comfortably and quickly. The conversion to an ambulance aircraft took place in 1926. Series production began in 1927. The K-4 airliner was developed from this type .

construction

The fuselage, which was extended by a few centimeters, consisted of a welded tubular steel frame and was clad with light metal sheets made of Kolchug aluminum up to the rear end of the cabin. The rest of the rear fuselage section was covered with fabric. The cabin for pilot and passengers was made in a closed design. The surface construction was designed as a shoulder wing. The wing center section was made of tubular steel and welded to the fuselage. The cladding was done with plywood. As with the K-2, the wings were braced from the outer edges of the center section to the lower part of the fuselage. The two outer wings were made of wood and covered with fabric. The elliptically shaped horizontal stabilizer, made of wood and covered with fabric, was braced towards the fuselage. The vertical tail was a tubular steel construction with fabric covering. The aircraft had a fixed landing gear with an independent suspension. At the stern of the fuselage was a spring-loaded tail spur.

Technical specifications

Parameter Data
crew 1
Passengers 3-4
length 11.25 m
span 16.76 m
Wing area 40.00 m²
Wing extension 7th
Wing loading 57.5 kg / m²
Power load 9.6 kg / hp
Preparation mass 1560 kg
Payload 740 kg
Takeoff mass 2300 kg
Engine a liquid-cooled six - cylinder in - line BMW IV engine
with a rigid two-bladed wooden propeller
power 176 kW (approx. 240 PS)
Fuel volume 265 kg
Top speed 170 km / h
Cruising speed 140 km / h (economical)
Landing speed 75 km / h
Rate of climb 1.5 m / s
Service ceiling 3880 m
Max. Range 730 km
Take-off run 250 m
Landing runway 200 m

literature

Web links

Commons : Kalinin K-3  - Collection of pictures, videos and audio files