The Cierva W.11 Air Horse was a helicopter developed by the Cierva Autogiro Company in the United Kingdom during the mid-1940s. The largest helicopter in the world at the time of its debut, the Air Horse was unusual for using three rotors mounted on outriggers, and driven by a single engine mounted inside the fuselage.

Saunders-Roe Limited, also known as Saro, was a British aerospace and marine-engineering company based at Columbine Works, East Cowes, Isle of Wight.