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Sikorsky S-6 / S-10

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Under the designation S-10, about sixteen production versions of the S-6B were built by the RBVZ. The majority were delivered as twin-float seaplanes for service with the Baltic Fleet, from the summer of 1913 to 1915, with 100hp Argus or Gnome Monosoupape engines. Some were deployed on the world's first operational seaplane carriers.

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A special Competition S-10 landplane, with 80hp Gnome engine, was built for the 1913 military aircraft competition. The wing span was increased to 16.75m, with outer panels that could be folded for storage. The two seats were placed side-by-side, and the control wheel could be swung from pilot to co-pilot during flight. Production test pilot Alechnovich set a Russian record by flying it 500km in 4 hours 56 minutes, and it took first prize in the 1913 competition although it lacked the speed and manoeuvrability of the S-6B. After its span had been reduced to 13.70m and a 100hp Monosoupape installed, it served as a trainer with the Baltic Fleet.

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The S-10A's span of 13.7m and two seats in tandem set the standard for all S-10 seaplanes, and its 125hp (de-rated to l00hp) Anzani engine gave it better speed and rate of climb than the Competition S-10. Its flying characteristics were less good, preventing it from gaining first prize, but it set a new Russian height record of 3420m, piloted by Gleb Alechnovich. Modified to have a 100hp Monosoupape and floats, it was assigned to the Baltic Fleet.

Engine: 1 x 100hp Argus
Wingspan: 16.9 m / 55 ft 5 in
Length: 8.0 m / 26 ft 3 in
Height: 4.1 m / 13 ft 5 in
Wing area: 45.0 sq.m / 484.38 sq ft
Max. speed: 90 km/h / 56 mph

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