Vertipedia is a product of the Vertical Flight Society. With data on 863 aircraft, 620 historical milestones, 494 people, and 395 organizations, Vertipedia is your "one-stop shop" for all things vertical lift.
Our latest featured aircraft for December is the Cierva W.11 Air Horse .
The aircraft was designed to provide viable heavy load lifting capability for commercial operations. It employed 3 main rotors all rotating in the same direction. Torque offset was provided by thrust components from the 3 rotors through built-in shaft tilt. The aircraft had a semi-monoquoque structure, a single engine, and a long-stroke undercarriage (5ft) to cope with high rates of descent. A description of the aircraft and its characteristics can be found in the following references,
Source: "The Cierva W-11 Air Horse", J. Gordon Leishman, VERTIFLITE Spring 2003, Page 52
Source: "Discussing the Helicopter", FLIGHT Staff, FLIGHT, December 2nd 1948, Pages 665-668
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Engines and power ratings
Vertipedia enables the rating structure for an engine to be defined. The rated power for an engine is assumed to equal the maximum power, under non-emergency conditions - normally the Take-off power. All engine powers are uninstalled at SL ISA conditions. Many engines are de-rated or limited for specific aircraft installations. Where this is known, the engine is described using the name template '[Engine designation] (as used on [Aircraft ABC])'. Gearbox torque limits are not currently available.
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