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    This engine has passed the admiralty fifty hour dynamometer tests and has shown up very well indeed for an air-cooled engine. It is very light. When one considers its weight of 1 3/4 pounds per horsepower, it can be readily seen what a stride this engine represents in the aeronautical motor work. The diameter over all of this engine is approximately fifty inches. Of course this makes it rather difficult to cowl in a single seater pursuit plane and makes quite a large nose.

LUCIFER 100 HORSEPOWER ENGINE [underline]
    Another type that the Bristol Company has developed has been the Lucifer 100 horsepower type with three cylinders of the same size as are used in the Jupiter type. Dual ignition is provided in the Lucifer and the total weight of the engine is about 300 pounds. The normal r.p.m. are 1,600. This engine has been designed primarily to provide a comparatively low power unit. The main considerations of the Bristol Company have been reliability in long life, combined with the low cost of upkeep and ease of production. No attempt has been made to cut the weight, but to obtain the maximum durability and performance from the engine. The parts have been reduced to a minimum and everything sacrificed for endurance and long life. This motor is not a military type.

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