Loose Leaf for Fundamentals of Aerodynamics
Loose Leaf for Fundamentals of Aerodynamics
6th Edition
ISBN: 9781259683992
Author: Anderson, John
Publisher: McGraw-Hill Education
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Chapter 4, Problem 4.14P

The question is often asked: Can an airfoil fly upside-down? To answer this, make the following calculation. Consider a positively cambered airfoil with a zero-lift angle of 3 ° . The lift slope is 0.1 per degree. (a) Calculate the lift coefficient at an angle of attack of 5 ° . (b) Now imagine the same airfoil turned upside-down, but at the same 5 ° angle of attack as part (a). Calculate its lift coefficient. (c) At what angle of attack must the upside-down airfoil be set to generate the same lift as that when it is right-side-up at a 5 ° angle of attack?

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