Renault 6Q

{{Infobox Aircraft Begin

|name= Renault 6Q

|image= File:Renault 6Q-11 MLP 04.jpg

|caption=Renault 6Q on display at the Polish Aviation Museum

}}{{Infobox Aircraft Engine

|type=6-cylinder inverted air-cooled inline

|manufacturer=Renault

|designer=

|national origin=France

|first run=c.1932

|major applications=

|produced=

|number built=>3360

|program cost=

|unit cost=

|developed from=

|variants with their own articles=

}}

The Renault 6Q, also called the Renault Bengali 6, is an air-cooled inverted in-line six-cylinder, aircraft piston engine, producing about {{convert|220|hp|kW|abbr=on|-1|order=flip}} continuous power. It was designed and built in France and produced for more than ten years after its homologation in 1936, with large numbers built during World War II.

Design and development

The six-cylinder Renault 6Q and the four-cylinder Renault 4P, both from the early 1930s, shared the same bore, stroke and pistons.

The 6Q was built in both unsupercharged and supercharged forms. The centrifugal supercharger was added at the back of the engine, driven off the crankshaft via step-up gearing. It added {{convert|13|kg|lb|abbr=on|0}} to the weight and {{convert|242|mm|in|abbr=on|1}} to the length but boosted the performance at altitude to a continuous power of {{convert|237|hp|kW|0|abbr=on|order=flip}} at 2,500 rpm and {{convert|2200|m|ft|-1|abbr=on}}. Two pre-war models were optimised to different altitudes, the 02/03 right- and left-handed pair to {{convert|2000|m|ft|-1|abbr=on}}, with 7.61:1 gearing and the 04/05 pair to {{convert|4000|m|ft|-1|abbr=on}}, with 12.274 gearing.

Operational history

The 6Q was homologated in 1936; 1700 were built before the war and 1660 during it. Post-war, production was resumed. The majority of pre-war 6Qs were used in Caudron C.440 Goélands, during the war in Goélands and post-war in Nord's Messerschmitt Bf 108 derived Nord Pingouin, in the Nord Noralpha and Ramier Bf 108 developments.

Variants

File:Renault6Q10Aengine.JPG]]

Even sub-type numbers rotate clockwise, odd numbers anti-clockwise as seen from engine.

;Renault 6Q-00/01: Unsupercharged LH/RH rotation

;Renault 6Q-02/03: {{convert|220|hp|kW|abbr=on}} Supercharged to {{convert|2000|m|abbr=on}} LH/RH rotation

;Renault 6Q-04/05: {{convert|240|hp|kW|abbr=on}} Supercharged to {{convert|4000|m|abbr=on}} LH/RH rotation

;Renault 6Q-06/07: {{convert|233|hp|kW|abbr=on}} LH/RH rotation

;Renault 6Q-08/09: {{convert|240|hp|kW|abbr=on}} LH/RH rotation

;Renault 6Q-10/11: {{convert|230|hp|kW|abbr=on}} LH/RH rotation

;Renault 6Q-18/19: LH/RH rotation

;Renault 6Q-20/21: {{convert|300|hp|kW|abbr=on}} LH/RH rotation

Applications

Engines on display

Ailes Anciennes, Toulouse: Renault 6Q 10 in a Nord 1101 Ramier I.

Specifications (post-war unsupercharged)

{{pistonspecs|

|ref=Jane's All the World's Aircraft 1948, p.55d

|type=6-cylinder inverted air-cooled inline

|bore={{convert|120|mm|in|2|abbr=on}}

|stroke={{convert|140|mm|in|2|abbr=on}}

|displacement={{convert|9.5|L|cuin|0|abbr=on}}

|length={{convert|1600|mm|in|1|abbr=on}}

|width={{convert|510|mm|in|1|abbr=on}}

|height={{convert|920|mm|in|1|abbr=on}}

|weight={{convert|240|kg|lb|0|abbr=on}} dry

|valvetrain=One inlet and one exhaust valve per cylinder with Austenitic, driven via tappets, rocker arms and pushrods from a camshaft in the crankcase.

|fuelsystem=Twin Zenith carburetters and SEV ignition magnetos; two sparking plugs per cylinder.

|fueltype=

|oilsystem=Dry sump with pump to crankshaft, camshaft and big ends. Cylinders and pistons splash lubricated.

|coolingsystem=Air

|power=Take-off {{convert|233|hp|kW|0|abbr=on|order=flip}} at 2,500 rpm; normal {{convert|218|hp|kW|0|abbr=on|order=flip}} at 2,500 rpm and {{convert|500|m|ft|0|abbr=on}}

|specpower=

|compression=6:1

|fuelcon=

|specfuelcon=

|oilcon=

|power/weight=

|designer=

|reduction_gear=

|general_other=

|components_other= Cylinders: Steel barrels with machined fins aluminium heads with cast fins and hemispherical combustion chamber.

Pistons: Aluminium alloy forged with four piston rings and floating gudgeon pins. Duralumin connecting rods with white metal big-end bearings and bronze little-end bushes.
Crankshaft: Forged steel with six throws and seven bearings.
Crankcase: Aluminium, with magnesium cover and main bearing in crankcase extension.

|performance_other=

}}

References

{{Reflist|refs=

{{cite book |title= Jane's All the World's Aircraft 1938|last= Grey |first= C.G. |year=1972|publisher= David & Charles|location= London|isbn=0715-35734-4|page=53d }}

{{cite book |title= Jane's All the World's Aircraft 1948|last= Bridgman |first= Leonard |year=1948|publisher=Sampson, Low, Marston and Co. Ltd|location= London|page=55d }}

{{cite book |title= World Encyclopaedia of Aero Engines|last=Gunston|first=Bill|edition=4| year=1998|publisher=Patrick Stephens Ltd |location=Wellingborough |isbn=1-85260-163-9|page=149}}

{{cite book |title=Aviation Museums and Collections of Mainland Europe |last= Ogden |first=Bob |year=2009|publisher= Air Britain (Historians) Ltd|page=125 |isbn=978-0-85130-418-2}}

{{cite web |url=http://www.hydroretro.net/etudegh/renault.pdf|title=Les Moteurs d'Aviation Renault |author=Gerard Hartmann |page=24 |access-date=14 March 2014}}

}}

Category:Air-cooled aircraft piston engines

Category:Inverted aircraft piston engines

Category:1930s aircraft piston engines

6

Category:Straight-six engines