Cierva C.19 Avro 620
Cierva licensed production to Avro as the Avro 620.
The Cierva C.30A marked a major step forward in rotorcraft development, being the first production autogiro in which the engine was geared directly to drive the rotor blades for take-off. The degree of direct control was increased still further by having the control column, which acted directly on the rotor, suspended from the pylon so that the rotor head could be tilted in any direction to produce the manoeuvre desired. The new-style control system was first installed in G-ABXP, a Cierva C.19 designated Mk.V with a 100hp Genet Major I engine. This was basically a C.19 Mk.IV modified to have a clutch and transmission shaft, a tilting rotor head and (later) a small, fixed tailplane.
C-19 Mk.III
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