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What parameter is used to decrease the stall speed?

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What parameter is used to decrease the stall speed?

(a) Chord

(b) Chord line

(c) Camber

(d) Camber line

This question was posed to me in my homework.

Question is from Airfoil Nomenclature topic in section Incompressible Flow over Airfoils of Aerodynamics

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Correct answer is (c) Camber

Explanation: Camber is generally used to increase the maximum lift coefficient. Which in turn it decreases the stall speed of the aircraft. Due to decrease in the stall there will be an increase in the lift. In supercritical airfoil. There will be a highly cambered curve after section which used in supersonic flight for their maximum lift.

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