Armstrong Siddeley Heritage Trust
Armstrong Siddeley Viper Turbojet
The viper started life as a low cost expendable engine for the Australian Jinivick Target Drone Aircraft. Long-life versions soon followed, with flight testing in the tail of an Avro Lancaster, including reheat trials. The design originally featured a seven-stage compressor based on the Armstrong Siddeley Adler engine, which is in effect a large-scale Adder.
The first use of the long life engine was in the Jet Provost aircraft that was used by the RAF for pilot taining.
Armstrong Siddeley Tiger Aero-Engine
Ipso
Armstrong Whitworth Ensign powered by Tiger IXC in flight and unloading passengers at Croydon Aerodrome
Heinkel HE46d Panther
Leading Particulars of Tiger Engines
Engine Type 14-cylinder, two-row air-cooled, radial aero-engine
Bore 5.5 inch (127 mm)
Stroke 6.0 inch (140 mm)
Volume 1996 cu. in. (32.7litre)
Tractor Drive Geared Epicyclic
Variants
Mk I,
1932 570hp (419kW), Geared Fan, Compression ratio 5.2:1
MK III
193? 610hp (455kW), Geared Fan, Compression ratio 5.35:1
Mk IV
1934 720hp (530kW), Geared Fan, Compression ratio 5.35:1
Mk VI
1936 760hp (589kW), Geared Fan, Compression ratio 6.25:1
Mk VIC
No details known
Mk VIII
1936 860hp (633kW), Two-speed Supercharger, Compression ratio 6.2:1
Mk IX
1936 810hp (596kW), Geared Fan, Compression ratio 6.2:1
Mk IXC
1938 805hp (592kW), Geared Fan, Compression ratio 6.2:1
Mk X
193? 860hp (633kW), Geared Fan.Compression ratio 6.2:1
Note: The plain fan had no supercharging effect; the geared fan gave a mild supercharging effect.