![The de Havilland / AIRCO DH.9 two seater tractor biplane designed and built by The Aircraft Manufacturing Co. Ltd., Hendon, London, N.W.9. – Engine 250 h.p. Siddeley "Puma". Speed at 10,000ft., 110 The de Havilland / AIRCO DH.9 two seater tractor biplane designed and built by The Aircraft Manufacturing Co. Ltd., Hendon, London, N.W.9. – Engine 250 h.p. Siddeley "Puma". Speed at 10,000ft., 110](https://c8.alamy.com/zooms/6/dcd37b5c7482487283415be47d2246cb/2c7wk68.jpg)
The de Havilland / AIRCO DH.9 two seater tractor biplane designed and built by The Aircraft Manufacturing Co. Ltd., Hendon, London, N.W.9. – Engine 250 h.p. Siddeley "Puma". Speed at 10,000ft., 110
![9786134286336: Avro 539: Avro, Biplane, Schneider Trophy, Floatplane, Siddeley Puma, Hendon Aerodrome, Napier Lion, Aviation, Aviation history: 6134286338 - AbeBooks 9786134286336: Avro 539: Avro, Biplane, Schneider Trophy, Floatplane, Siddeley Puma, Hendon Aerodrome, Napier Lion, Aviation, Aviation history: 6134286338 - AbeBooks](https://pictures.abebooks.com/isbn/9786134286336-us.jpg)
9786134286336: Avro 539: Avro, Biplane, Schneider Trophy, Floatplane, Siddeley Puma, Hendon Aerodrome, Napier Lion, Aviation, Aviation history: 6134286338 - AbeBooks
![The installation of the four Siddeley Puma engines in the fuselage of the Bristol Tramp, looking aft, Stock Photo, Picture And Rights Managed Image. Pic. MEV-10847330 | agefotostock The installation of the four Siddeley Puma engines in the fuselage of the Bristol Tramp, looking aft, Stock Photo, Picture And Rights Managed Image. Pic. MEV-10847330 | agefotostock](https://previews.agefotostock.com/previewimage/medibigoff/4f1ee5842f6faecd8d0276dfbf98b46b/mev-10847330.jpg)