Gnome-Rhône 18L

The Gnome et Rhône 18L was a twin-row 18 cylinder air cooled radial engine. The 18L was a large step up in terms of displacement, power and number of cylinders. The majority of Gnome-Rhone engines being either 7, 9 or 14 cylinders. The engine proved not to be a success and it was dropped in 1939 due to a poor power to weight ratio. The American and British 18 cylinder engines proving lighter, smaller and generally more reliable.

pecifications (Gnome Rhone 18L)

pistonspecs

type=18 cylinder twin row air cooled radial eninge
bore=146mm (5.75 in)
stroke=180mm (7.09 in)
displacement= (3,308 cu in)
length=mm (in)
diameter=

width=mm (in)
height=1,400mm (55.12 in)
weight=736kg (1,622 lbs)
valvetrain=1 inlet and 1 exhaust valve per cylinder
supercharger=Yes
turbocharger=
fuelsystem=1 Bronzania Carburetor
fueltype=87 octane
oilsystem=
coolingsystem=air
power=1,300hp @ 2,150 RPM
specpower=
compression=6.10:1
fuelcon=
specfuelcon=
oilcon=
power/weight=1.25lb/hp @ cruise speed

References

* Gunston, Bill. (1986). "World Encyclopaedia of Aero Engines". Patrick Stephens: Wellingborough. p.84
* http://www.oldengine.org/members/diesel/Duxford/fraero2.htm