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What is the value of linear twist rate in general?

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What is the value of linear twist rate in general?

(a) Zero

(b) Positive

(c) Negative

(d) Infinite

The question was posed to me in an internship interview.

I want to ask this question from Helicopter Rotor and Notations in portion Helicopter Dynamics of Aerodynamics

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The correct choice is (c) Negative

To elaborate: The rotor blade of the helicopter is twisted along the length of the blade. The linear twist rate θtw is given by the difference between tip pitch and the root pitch, where the pitch is the angle of the blade. This value is mostly negative.

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