Sikorsky S-11
Russo-Balt / Sikorsky · Russian Empire · first flew 1913 · light aircraft
The Sikorsky S-11 Polukroogly (Half Round) was a Russian single-engine prototype reconnaissance aircraft completed in July 1913 while Igor Sikorsky was chief engineer of the aircraft division of the Russian Baltic Railroad Car Works.
Recognition (WEFT)
| W — Wings | Mid-mounted, straight |
|---|---|
| E — Engines | 1 × piston, nose-mounted |
| F — Fuselage | Gnome Monosoupape rotary engine in the nose, ahead of a conventional wooden fuselage |
| T — Tail | Conventional |
WEFT is AircraftIQ's four-point recognition method — how it works.
Spot it by:
- Mid-wing monoplane with wire-braced wings
- Two-seat cockpit with side-by-side seating and controls for the pilot only on the left
- Gnome Monosoupape rotary engine in the nose, ahead of a conventional wooden fuselage
A compact pre-war monoplane with a wire-braced mid-mounted wing, a conventional wooden fuselage and a rotary engine in the nose; the two seats sit side by side.
Specifications
- The Sikorsky S-11 has a length of 7.6 m (25 ft).
- It has a wingspan of 11.6 m (38 ft).
- Its maximum speed is 102 km/h (63 mph).
- Typical crew: 2.
Figures are for the representative variant described above; marks differ. See how AircraftIQ sources figures.
History
Based on the S-9 but smaller and lighter, the S-11 was a two-seat mid-wing monoplane with wire-braced wings and a 100 hp Gnome Monosoupape rotary engine. It was first built with ailerons controlled by steel tubes inside the wings, but limited roll authority led to a change to wing warping.
Variants
Only one S-11 was built; no variants are recorded.
Where you'll see it
Flight tests showed a short take-off run of 75 metres and a low stall speed. The S-11 took second place in a Russian military reconnaissance aircraft competition in 1913, but no further examples were ordered.
Related aircraft
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