Question

Which of the following is not an application of an airfoil?

(a) To provide thrust for acceleration

(b) To provide lift

(c) To provide lift co-efficient

(d) To provide streamlined flow

I had been asked this question in quiz.

This interesting question is from Airfoil Selection-2 in chapter Airfoil and Geometry Selection of Aircraft Design

Answer 1

The correct choice is (a) To provide thrust for acceleration

To explain: In an aircraft, engines are used to provide thrust for acceleration. Airfoil is used to provide lift, to improve certain flow characteristics. Streamlined flow is also produced by an airfoil.