Slessaryev Svyatogor

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Type: Bomb plane
Design country:

Russian Empire 1914Russian Empire Russia



First flight:

not happened

Production time:


Number of pieces:

1 prototype

The Slessarjew Svjatogor ( Russian Слесарев Святогор ) was a prototype of a Russian bomber from the First World War that never flew. It was named after a legendary figure and the largest airplane built in Russia of this era.


The double-decker design was worked out from 1913 by Wassili Slessarjew , who developed a rather unconventional drive principle. The two engines and the associated tanks were placed inside the fuselage near the central axis to enable maintenance during the flight. They were supposed to transmit their power via chain gears to two propellers located in frames behind the wings. In order to be able to finance the construction, Slessarjew asked government agencies for support, but was not granted any funds. Only when he turned to private sponsors could construction begin at the Lebedev plant in Saint Petersburg at the end of 1914 . In the meantime, however, the First World War had broken out and the intended Mercedes engines could not be delivered, which delayed completion considerably, because the French replacement engines from Renault did not arrive in Saint Petersburg until January 1916 and also had a lower output. In the meantime it had become apparent that the mass of the aircraft was considerably higher than calculated, so that the question of continuing the project arose. A convened commission, which included Nikolai Zhukovsky , Wladimir Wettschinkin and Alexander Archangelsky , came to a positive result after some aerodynamic calculations and recommended a continuation, after which some funds were probably approved, because the Svjatogor was completed and began a short time later in March with their testing. First, the power transmission turned out to be problematic, which is why Slessarjew replaced the chain drive with belts. From November the taxi attempts finally began, which ended with damage to the landing gear and the propellers when the aircraft got into an irrigation ditch. Simultaneous attempts to make the pattern fly were also unsuccessful. After the repairs were due, problems arose again with the power transmission and therefore thought was given to changing the engine and propeller arrangement. However, Slessaryev was opposed to this and insisted on keeping his concept. Ultimately, the unsuccessful attempts were stopped.


The hull of the Svjatogor consisted of a wooden hull with a rectangular cross-section and fabric covering. The supporting structure, designed in a double-decker configuration and provided with two box spars, was connected and braced by I and V struts. The tail unit was of normal construction and also braced and braced. The chassis consisted of two bow wheels with a diameter of 1.5 m and two main wheels with a diameter of 2.0 m each made of plywood with special tires and rubber damping. The two propellers, arranged in a pressure configuration, had a diameter of 6.00 m and reached speeds of rotation from 300 / min to 400 / min.

Technical specifications

Parameter Data
span 36.00 m
length 21.00 m
height k. A.
Wing area 180 m²
Trunk width 2.50 m
Empty mass 3250 kg
Payload 3250 kg
Takeoff mass 6500 kg
Wing loading 23.2 kg / m²
Power load 14.1 kg / hp
drive two Renaults with 220 hp (162 kW) each
Top speed 100 km / h
Range maximum 2500 km
crew 2-3


  • Heinz A. F. Schmidt: Soviet planes . Transpress , Berlin, p. 34 .

Web links

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