The Royal Aircraft Establishment Larynx (from "Long Range Gun with Lynx engine") was an early British pilotless aircraft, to be used as a guided anti-ship weapon. Started in September 1925, it was an early cruise missile guided by an autopilot.
A small monoplane powered by a 200 hp Armstrong Siddeley Lynx IV engine, it had a top speed of 200 mph (320 km/h); faster than contemporary fighters.
It used autopilot principles developed by Professor Archibald Low and already used in the Ruston Proctor AT, a radio controlled biplane that was intended to be used against German Zeppelin bombers.