Beardmore Cyclone
{{short description|1920s British aircraft piston engine}}
{{Use dmy dates|date=March 2017}}
{{Use British English|date=March 2017}}
| {{Infobox aircraft begin
|name = Cyclone |image = |caption = }}{{Infobox aircraft engine |type=Inline piston engine |manufacturer=William Beardmore and Company |national origin=United Kingdom |first run=1922 |major applications= |number built = |program cost = |unit cost = |developed from = |developed into = |variants with their own articles = }} |
The Beardmore Cyclone was an aero engine produced by William Beardmore & Co with the aim of producing an engine generating a high power output at low revolutions by designing an engine of large displacement.{{cite web|url=http://oldmachinepress.wordpress.com/2013/01/23/beardmore-cyclone-typhoon-and-simoon/|title=Beardmore Cyclone, Typhoon, and Simoon|date=24 January 2013 |accessdate=16 December 2013}} The design did not enter volume production.
Design and development
The Cyclone was an upright inline six-cylinder water-cooled engine with a bore of {{cvt|8.625|in}} and stroke of {{cvt|12|in}} stroke, giving a displacement of {{cvt|4207|cuin}}. It had a combined crankcase and cylinder block made of aluminium with steel cylinder liners and aluminium pistons. Each cylinder had its own detachable head, with two spark plugs and four valves operated by push-rods driven by a single camshaft. The compression ratio was 5.25 to 1.
The Cyclone was first run in 1922, producing 700 hp (522 kW) at 1,220 rpm. Further development increased output to 850 hp (634 kW) at 1,350 rpm but could produce 950 hp (708 kW) at the same rpm with a larger carburettor.
Variants
The Beardmore Typhoon was an inverted version of the Cyclone, with almost all parts being interchangeable between the two engines. It was test flown in Avro Aldershot J6852 in January 1927.{{cite journal|title=The Beardmore "Typhoon" Mark I Engine |journal=Flight |date=7 January 1927 |pages=44–45 |url=http://www.flightglobal.com/pdfarchive/view/1927/1927%20-%200044.html |accessdate=8 March 2018}}
A compression ignition version of the Typhoon was projected and was the original choice of power-plant for the R101 airship, but this version proved impractical.{{cite book |last1=Masefield |first1=Sir Peter G. |title=To ride the storm : the story of the airship R.101 |date=1982 |publisher=W. Kimber |location=London |isbn=978-0718300685 |page=464}}
Specifications
{{pistonspecs
|
|type= 6-cylinder liquid-cooled inline upright layout engine
|ref=Flight, 4 November 1926. p. 717.{{cite journal|title=THE BEARDMORE "CYCLONE" AERO ENGINE: 900 H.P. at 1,350 R.P.M|journal=Flight|date=4 November 1926|pages=717–718|url=http://www.flightglobal.com/pdfarchive/view/1926/1926%20-%200809.html|accessdate=8 March 2018}}
|bore= {{cvt|8.625|in}}
|stroke= {{cvt|12|in}}
|displacement= {{cvt|4207|cuin}}
|length={{cvt|80.3|in}}
|diameter=
|width={{cvt|35|in}}
|height={{cvt|61.125|in}}
|weight={{cvt|2150|lb}}
|valvetrain=four pushrod-actuated valves per cylinder
|supercharger=
|turbocharger=
|fuelsystem=
|fueltype=
|oilsystem=
|coolingsystem=Water cooling
|power={{cvt|950|hp}} at 1,350 rpm
|specpower=
|compression=5.25:1
|fuelcon=
|specfuelcon={{cvt|0.48|lb/hph|kg/kWh}}
|oilcon={{cvt|0.1|lb/hph|kg/kWh}}
|power/weight=
}}