it is generally umfangskomponenten c _ u the absolutgeschwindigkeiten positive if it in the direction of the radbewegung wise. the pedal right to the floor through the impeller changes c _ u of c _ u1 to c _ u2.diese change of umfangskomponenten corresponds to a change of impulsmoments (dralls) and, therefore, on the drallsatz a torque on the beschaufelung,thus the output of the impeller is given. it is therefore:
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