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Two separate pumps are used for lubrication, one forcing oil to the crank-pin bearing and the other spraying the cylinders. Among other designs of rotary aero engines the E.J.C. is noteworthy, in that the cylinders and crank case of this engine rotate in opposite directions, and two air-screws are used, one being attached to the end of the crankshaft, and the other to the crank case.
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