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Which shape is traced by the trailing vortex at the tip of the airscrew blade?

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in Aerodynamics by (773k points)
Which shape is traced by the trailing vortex at the tip of the airscrew blade?

(a) Helix

(b) Solenoid

(c) Circle

(d) Sine curve

This question was addressed to me in unit test.

Origin of the question is Blade Element Theory topic in chapter Helicopter Dynamics of Aerodynamics

1 Answer

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Best answer
Correct option is (a) Helix

Best explanation: On examining the vortex system of the airscrew blade, we see that the trailing vortex which is formed at the tip of the blade traces out helix as the airscrew advances and rotates, the trailing vortex takes a helical form.

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