“Armstrong Siddeley Python”的意思、由来-开放百科全书

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Armstrong Siddeley Python

释义

Design and development
Flight testing
Applications
Specifications (ASP.3)
See also
References
Notes Bibliography
External links

name=Python

image=ASPython.jpg

caption=An Armstrong Siddeley Python during NACA wind tunnel testing in 1949

}}{{Infobox Aircraft Engine

type=Gas turbine turboprop

national origin=United Kingdom

manufacturer=Armstrong Siddeley

designer=

1945}}

introduced=

retired=

status=

major applications=Westland Wyvern

number built =

program cost =

unit cost =

developed from = Armstrong Siddeley ASX

developed into =

variants with their own articles =

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 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 eshp (equivalent shaft horsepower).

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 {{convert|24|ft|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 {{convert|34,783|ft|m|abbr=on}} with a bombing error of 61 ft.^[2]

Applications

Avro Lancaster - (test only)
Avro Lincoln - (test only)
Westland Wyvern

Specifications (ASP.3)

{{jetspecs
|
|ref=Flight^[3]
|type=Turboprop
|length=123.2 in (3129 mm)
|diameter=54 in (1372 mm)
|weight=3,450 lb (1565 kg)
|compressor=axial flow; 14 stages
|combustion=11 combustion chambers
|turbine=axial flow; two stages
|fueltype=
|oilsystem=
|power=4,110 eshp (3,065 kW) at sea level at 8,000 rpm, including 1,180 lbf (535 kgf) exhaust thrust
|thrust=
|compression=5.35:1
|aircon=52.5 lb/s (23.8 kg/s)
|turbinetemp=
|fuelcon=
|specfuelcon=0.805 lb/(h eshp)
|power/weight=1.2:1
|thrust/weight=}}

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

{{cite book|last1=Gunston|first1=Bill|title=World encyclopaedia of aero engines : all major aircraft power plants, from the Wright brothers to the present day|date=1998|publisher=P. Stephens|location=Sparkford, Nr Yeovil, Somerset, [England]|isbn=978-1852605971|edition=4th}}
{{cite book |last=Gunston |first=Bill |title=World Encyclopaedia of Aero Engines |year=1989 |publisher=Patrick Stephens Limited |location=Cambridge, England |isbn=978-1-85260-163-8 |edition=2nd}}
{{cite book |title=Jane's all the World's Aircraft 1947 |edition= |editor1-last=Bridgman |editor1-first=Leonard |year=1947 |publisher=Sampson Low, Marston & Co |location=London|pages=4d-5d}}

External links

Image of the Python-engined Lancaster B.Mk.I (FE) TW911
"Python" a 1949 Flight article on the Python

3 : Turboprop engines 1940–1949|Armstrong Siddeley aircraft engines|Axial-compressor gas turbine engines

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