Alvis Pelides
{{short description|1930s British piston aircraft engine}}
{{Use dmy dates|date=February 2018}}
{{Use British English|date=February 2018}}
| {{Infobox Aircraft Begin
|name= Pelides |image = AlvisPelides.JPG |caption = Rear view of the Alvis Pelides }} {{Infobox Aircraft Engine |type= Radial aero engine |national origin = |manufacturer=Alvis |first run=1936 |major applications= Not flown |number built = 15 |program cost = |unit cost = |developed from = Gnome-Rhône Mistral Major |developed into = |variants with their own articles = }} |
The Alvis Pelides was an unflown British air-cooled radial aero engine first developed in 1936. The Pelides Major was a projected but unbuilt development as were the Alcides, Alcides Major and the Maeonides Major, the Alvis aircraft engine range taking their names from Greek mythology.Lumsden 2003, p.57.
Design and development
The Pelides was the first aero engine of Alvis design; the company had previously only built the French Gnome-Rhône Mistral Major under license.Gunston 1989, p.13. With the two companies working closely together the 14 cylinder radial layout of this engine retained metric dimensions but substituted metric screw threads with British fasteners such as BSF and Whitworth. Material specifications were different as were the detail design of internal parts such as the crankpin. The Pelides passed a 50-hour Air Ministry type test in 1937 where it produced 1,065 hp (794 kW) but no aircraft application was found and only 15 engines were built. The onset of the Second World War caused the abandonment of any further development of the Pelides and its related designs.Lumsden 2003, p.56.
Variants (projected)
;Pelides: {{cvt|1000|/|1050|hp}} 2-row 14-cylinder radial, {{cvt|5.75|x|6.5|in}} (bore x stroke), {{cvt|38.67|L|cuin|2}}, LH or RH, d/d, 13:19 or 0.5:1.{{cite book |title=Jane's All the World's Aircraft 1937 |year=1937 |publisher=Sampson, Low & Martin company Limited |location=London| pages=4d-5d}}
;Pelides Major:The Pelides Major was a version retaining the same dimensions as the Pelides but with improvements to the supercharger, only built in small quantities for testing at {{cvt|1000|hp}}.
;Alcides:The Alcides of 1937 was a powerful supercharged 18-cylinder two-row radial engine, with a power output of {{cvt|1650|/|1725|hp}}. 2-row 18-cylinder radial, {{cvt|5.75|x|7.09|in}} (bore x stroke), {{cvt|54.24|L|cuin|2}}, LH or RH, d/d, 13:19 or 0.5:1.
;Alcides Major:The Alcides Major was an improved supercharged version of the Alcides.
;Maeonides Major:Also designed in 1937, the supercharged Maeonides Major was effectively a smaller version of the Pelides with a power output of {{cvt|680|hp}}. 2-row 14-cylinder radial, {{cvt|4.803|x|4.567|in}} (bore x stroke), {{cvt|18.98|L|cuin|2}}, LH or RH, 5:7.
Specifications (Pelides)
{{pistonspecs
|
|ref= Lumsden and Flight[http://www.flightglobal.com/pdfarchive/view/1937/1937%20-%200982.html Flight -15 April 1937] Retrieved: 6 February 2009
|type= 14-cylinder 2 row supercharged air-cooled radial piston engine
|bore= 5.75 inch (146 mm)
|stroke= 6.5 inch (165 mm)
|displacement= 2,359.8 cu in (38.7 L)
|length=
|diameter= 52 in (1321 mm)
|width=
|height=
|weight= 1,190 lb (540 kg)
|valvetrain= Two pushrod-actuated poppet valves per cylinder with sodium-cooled exhaust valve.
|supercharger= Single speed, single stage
|turbocharger=
|fuelsystem= Heated Zenith carburettor
|fueltype= Petrol, 87 Octane
|oilsystem= Dry sump
|coolingsystem= Air-cooled.
|power= 1,000 hp (746 kW) at 2,400 rpm (rated power)
|specpower=
|compression=5.5:1
|fuelcon=
|specfuelcon=
|oilcon=
|power/weight= 0.84 hp/lb (1.4 kW/kg)
}}
See also
{{aircontent
|see also=
|related=
|similar aircraft=
|lists=
|similar engines=
}}
References
=Notes=
{{Reflist}}
=Bibliography=
{{refbegin}}
- [http://www.flightglobal.com/pdfarchive/view/1937/1937%20-%200982.html Flight magazine - 15 April 1937 (Flightglobal.com)]
- Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. {{ISBN|1-85260-163-9}}
- Lumsden, Alec. British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing, 2003. {{ISBN|1-85310-294-6}}.
{{refend}}
External links
- [http://www.flightglobal.com/pdfarchive/view/1938/1938%20-%200542.html Alvis Pelides displayed at a 1938 trade fair - Flightglobal.com]
{{Alvis aeroengines}}