Vertipedia is a product of the Vertical Flight Society. With data on 864 aircraft, 620 historical milestones, 506 people, and 395 organizations, Vertipedia is your "one-stop shop" for all things vertical lift.
Our latest featured aircraft for September 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
Vertipedia notes are brief descriptions of how and why Vertipedia works the way it does. Check back often for the latest note, or view the complete list.
Compound terms in Vertipedia are only applied to helicopter and gyroplane VTOL types (with one exception). This follows the accepted practice within the industry. For gyroplanes, only the lift compound term is applied to gyroplanes with wings - thrust compounding is inherent in that class of rotorcraft. One other aircraft that is marked as having lift compounding is the Herrick HV-2 Convertaplane, which could effectively become an autogyro when the fixed wing was allowed to rotate in flight.
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