Bartini Stal-6

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Bartini Stal-6
Bartini Stal-6.jpg
Type: Experimental airplane
Design country:

Soviet Union 1923Soviet Union Soviet Union

Manufacturer:

NII GWF

First flight:

Autumn 1933

Number of pieces:

1

The Bartini Stal-6 ( Russian Бартини Сталь-6 ) was a single-engine experimental aircraft that was developed and manufactured in the USSR from 1930 .

History and construction

After moving to OOS (Otdjel Opytnowo Samoljotostroenija, Department of Experimental Aircraft Construction), Robert Bartini was appointed head of his own design office, where he carried out plans for the construction of high-speed aircraft. However, after he submitted his proposal to the ZKB (Zentralnoje Konstruktorskoje Bjuro, Central Construction Office ), it took another 18 months before permission was given to proceed with the project. The main component of Stal-6 was liquid-cooled twelve-cylinder - V-engine Curtiss Conqueror . The frontal resistance of the engine determined the width of the adjoining fuselage cross-section, which stretched evenly over the entire length including the canopy, which ended with the upper edge of the fuselage. The landing gear consisted of a manually retractable main wheel and support spurs on the wing tips. In order to reduce the air resistance of the cooler, the wings were made of double-walled Enersch-6 - stainless steel has been carried out, a surface cooling system is integrated in addition to the conventional radiator, which worked according to the evaporation principle. The flight tests began in the autumn of 1933 by Andrei Jumaschew and Pjotr ​​Stefanowski and resulted in exceptional performance and the setting of a Soviet speed record. But problems with the evaporation system and the poor visibility from the cockpit were insurmountable. It was therefore decided to replace the evaporation system with an ethylene glycol-based cooling circuit, which had a better specific heat exchange and a higher superheating limit.

variants

Stal-8

The Stal-8 was the fighter aircraft that was developed directly from the previous Stal-6 experimental aircraft. The Curtiss Conqueror V12 engine was replaced by a Klimow M-100A (license build of the Hispano-Suiza 12Ybr ). Here, too, its cross-section dictated the streamlined shape of the fuselage, which stretched from the bow to the stern, but this time interrupted by the cockpit canopy, which was moved upwards to improve the pilot's view. Two 7.62 mm SchKAS - machine guns were mounted above the engine, to be able to shoot through the propeller arc, with a breaker gear were equipped. The construction of the prototype with plywood-clad tubular steel fuselage and wings with the evaporator cooling system and double-walled Enersch paneling was approximately 90% complete when the Soviet Air Forces decided to end the aircraft project due to the fragility of the cooling system.

Technical data (Stal-6)

Parameter Data
crew 1
length 6.88 m
span 9.0 m
Wing area 14.3 m²
Empty mass 850 kg
Takeoff mass 1080 kg
Engine 1 × Curtiss V-1570 Conqueror, 630 PS (463 kW)
Top speed 420 km / h
Rate of climb 21 m / s

literature

  • Bill Gunston: The Osprey Encyclopaedia of Russian Aircraft 1875-1995 . Osprey, London 1995, ISBN 1-85532-405-9 .

Web links

Commons : Bartini Stal-6  - Collection of images, videos and audio files

Individual evidence

  1. ↑ Gunston 1995, p. 42.