Description and Laboratory Tests of a Roots Type Aircraft Engine Supercharger (1926)
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e rotors as well as to transmit torque from one rotor shaft to the other. In the original design contact between the ends of the rotors and the housing was limited to a narrow ring near the shaft by a slight projection on the rotor ends formed on the flanged hubs. In most of the work all contact at… … Fig. 1.—N. A. C. A. Roots type supercharger with Liberty-12 engine It was originally intended that lubrication would be furnished from the main oil-pressure system of the engine. During the tests of the supercharger alone, however, it was found that a metering orifice, about No. 70 drill, had to be…
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