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Keywords: Cycloidal rotor construction - 2 lobes.svg Diagram showing the construction of a 2-lobed cycloidal rotor like that found in a Roots blower The red curve is an hypocycloid outside the larger generating circle black and the blue curve is an epicycloid The smaller circles are 1/4 the diameter of the larger circle The solid curve is the profile of the rotor - half is the epicycloid and half is the hypocycloid own 2010-08-27 Inductiveload Lobe pumps Hypocycloid Epicycloid |