Renault 70 hp

70 hp/Type WB
Type	Air-cooled V-8 piston engine
National origin	United Kingdom
Manufacturer	Renault Ltd Rolls-Royce Limited Wolseley Motors Limited
First run	c.1913
Major applications	Airco DH.1 Royal Aircraft Factory B.E.2
Number built	227
Developed into	Renault 80 hp

The Renault 70 hp or Type WB was a British V-8 aero engine that first ran circa 1913. The engine was manufactured by Renault Limited of West Brompton, London between August 1914 and December 1918, three other companies, including Rolls-Royce, also produced the engine. A variant known as the Type WC used an external oil pump as opposed to the internal pump of the Type WB.^[1] The Renault V-8 engines were noted as inefficient but reliable, the inefficiency being mainly due to the excessively rich fuel/air mixture used to assist cooling.^[2]

Applications

Airco DH.1
Armstrong Whitworth F.K.2
Armstrong Whitworth S.S.27 airship
Blackburn Type E
Bristol B.R.7
Caudron G.3
Central Centaur IVA
Farman MF.7 Longhorn
Farman Shorthorn
Flanders F.4
HMA no.2 airship, short-lived modification
Royal Aircraft Factory B.E.2
Royal Aircraft Factory F.E.2
Royal Aircraft Factory R.E.1
White & Thompson Bognor Bloater

Specifications (70 hp)

Data from Lumsden ^[1]

General characteristics

Type: Inline air–cooled, upright, 90-degree, V-8 piston engine
Bore: 3.78 in (96 mm)
Stroke: 4.72 in (120 mm)
Displacement: 423.76 cu in (7 L)
Length: 45.5 in (1,156 mm)
Width: 29.8 in (757 mm)
Height: 32.8 in (833 mm)
Dry weight: 396 lb (180 kg)

Components

Valvetrain: Single overhead exhaust valve, single side inlet valve per cylinder.Although this valve arrangement is cited as "one side and one overhead valve" it should be noted that both valves are situated in a lateral pocket from/to which gases flow. Therefore both valves are "side valves" one on top of this lateral pocket and on on its bottom. There are no valves on the combustion chamber or on the overhead position.
Fuel system: Single carburettor
Fuel type: 40–50 octane petrol
Cooling system: Air-cooled
Reduction gear: 0.5:1, left hand tractor (There is no proper "reduction gear". The reduction in this case is achieved due to the fact that the Airscrew is mounted on the Cam Shaft, therefore the shaft rotation speed, and so the airscrew, is half of the crank speed)

Performance

Power output: 70 hp (52 kW) at 1,750 rpm (takeoff power)
Specific power: 0.17 hp/cu in (7.4 kW/L)
Compression ratio: 4.12:1
Power-to-weight ratio: 0.18 hp/lb (0.28 kW/kg)

References

Notes

1 2 Lumsden 2003, p. 180
↑ Gunston 1989, p. 135.

Bibliography

Gunston, Bill. World Encyclopaedia 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.

Renault aero engines

35-40 hp V-4 45 hp V-8 60 hp V-8 70 hp Type WB 70 hp Type WC 80 hp Type WS 100 hp V-8 130 hp V-8 100 hp V-12 120 hp V-12 160 hp 190 hp V-12 200 hp V-12 265 hp V-12 438 446 454 456 468 626 4B 4P 6P 6Q 7A 8A 8B 8C 8G 9A 9C 9P 12D 12E 12F 12H 12J 12K 12M 12N 12R 12S 18J Renault Bengali 4 Renault Bengali 6

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