60 kW (80 hp) Armstrong Siddeley Genet radial piston engine. (three built) C.19 Mk.II – This variant was powered by a 78 kW (105 hp) Armstrong Siddeley Genet Major radial piston engine. The Genet Major engine was used on all further variants. (three built) C.19 Mk.IIA – Mk.II with improved rotor head. (one built) C.19 Mk.III – (six built) C.19 Mk.IV – The definitive production version, the basis for foreign licences. (15 built) C.19 Mk.V – One-off experimental aircraft, tilting rotor head development machine. (one built) C.20 – Focke-Wulf licence-built version with Siemens Sh 14 engine. C.21 – Lioré et Olivier licence-built version. (not built) Survivors An Avro-built C.19 Mk.IVP (EC-AIM) is on display at the Museo del Aire, Cuatro Vientos, Madrid, Spain. Specifications (Mk.II) See also References Bibliography Jackson, A.J. Avro Aircraft since 1908. (1965) London: Putnam Aeronautical Books pages 433–5. Further reading External links Aerial view of G-ABUD flying on 1 June 1932 Another aerial view of G-ABUD flying on 1 June 1932 1920s British civil utility aircraft Single-engined tractor autogyros Aircraft first flown in 1929 C.19