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What is the azimuth angle of the rotor blade for a constant rotational speed?

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What is the azimuth angle of the rotor blade for a constant rotational speed?

(a) 0

(b) Ω

(c) Ωt

(d) 2Ωt

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This interesting question is from Helicopter Rotor and Notations in division Helicopter Dynamics of Aerodynamics

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The correct answer is (c) Ωt

For explanation: The azimuth angle for a rotor blade is given by the angle between the downstream direction and the blade span axis. This angle is measured in the direction of the rotation of the blade. It is zero in the downstream direction and Ωt for a constant rotational speed.

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