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What is the leading edge radius of LS-0417 airfoil?

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What is the leading edge radius of LS-0417 airfoil?

(a) 0.07c

(b) 0.05c

(c) 0.08c

(d) 0.09c

The question was posed to me during an interview for a job.

Asked question is from Modern Low Speed Airfoils topic in chapter Incompressible Flow over Airfoils of Aerodynamics

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The correct choice is (c) 0.08c

To explain: LS-0417 airfoil has a leading edge radius of 0.08c in comparison to the standard 0.02c in order to flatten the usual peak in pressure coefficient near the nose, also that the bottom surface near the trailing edge is cusped in order to increase the camber.

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