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The Armstrong Siddeley Python was an early British turboprop engine designed and built by the Armstrong Siddeley company in the mid-1940s. Its main use was in the Westland Wyvern, a carrier-based heavy fighter. The prototypes had used the Rolls-Royce Eagle piston engine, but Pythons were used in production aircraft. In this application, the Python was rated at 4,110 equivalent shaft horsepower (eshp).

Python
An Armstrong Siddeley Python during NACA wind tunnel testing in 1949
Type Turboprop
National origin United Kingdom
Manufacturer Armstrong Siddeley
First run April 1945
Major applications Westland Wyvern
Developed from Armstrong Siddeley ASX

Design and development


The design started as an experimental pure-turbojet known as the ASX, which commenced testing in 1943. By this point other engine designs were already entering pre-production, and it seemed there was little need for the ASX in its existing form. The design was then modified by the addition of a reduction gearbox to drive a propeller. The turboprop thus formed was named ASP.[1]


Flight testing


Early flight-testing of the Python was carried out using the Lancaster B.1 (FE) TW911 and the Lincoln B.2 RE339/G: in each aircraft Pythons replaced the two outboard Rolls-Royce Merlins.

Lincoln B.2 RF403 had two Pythons similarly installed and was used for high-altitude bombing trials at Woomera, South Australia. These trials were principally of the ballistic casings for the Blue Danube atomic weapon: the Lincoln was the only available aircraft that could accommodate the large weapon casing, measuring 62 inches diameter x 24 feet (7.3 m) in length. The Pythons were fitted to increase the height from which tests could be carried out. Maximum release height and speed for the first eleven tests was 275 mph and 34,783 ft (10,602 m) with a bombing error of 61 ft.[2]


Python Engine on public display


An Armstrong Siddeley Python is on display at the East Midlands Aeropark Castle Donington.


Variants


ASP.1 (Python 1)
reduction gear ratio 0.127:1
ASP.2 (Python 2)
reduction gear ratio 0.135:1
ASP.3 (Python 3)

Applications



Specifications (ASP.3)


Data from Flight.[3]

General characteristics

Components

Performance


See also


Related development

Related lists


References



Notes


  1. Gunston 1998, p.19.
  2. The National Archives, London, file ES 1/44 E4C Appendix 3 page 1.
  3. Flight Global Archive - 1954 www.flightglobal.com. Retrieved: 3 November 2008

Bibliography





На других языках


[de] Armstrong Siddeley Python

Der Armstrong Siddeley Python war ein Turboprop-Triebwerk, den der britische Hersteller Armstrong Siddeley ab April 1945 herstellte. Die Maschinen wurden hauptsächlich in die Westland Wyvern, einen schweren, trägerbasierten Jäger, eingebaut. Darin entwickelte die Maschine etwa 4100 eshp (3000 kW).
- [en] Armstrong Siddeley Python

[fr] Armstrong Siddeley Python

L’Armstrong Siddeley Python était un turbopropulseur conçu et fabriqué par la compagnie Armstrong Siddeley au milieu des années 1940. Son utilisation principale fut la propulsion du chasseur lourd embarqué Westland Wyvern. Les prototypes de cet appareil avaient employé le moteur à pistons Rolls-Royce Eagle (en), mais les appareils de série furent équipés du Python. Dans cette utilisation, leur puissance de sortie était de 4 110 ESHP (en anglais : Equivalent Shaft HorsePower, correspondant au nombre de chevaux sur l'arbre).



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