If an airfoil is operating at Mach 1.1, then it is working in _____

transonic range

subsonic range

hypersonic range

supersonic range

Correct Answer : transonic range

Explanation : Based on mach number flow can be subsonic, supersonic, transonic or hypersonic. If flow mach number is <0.8 then it is subsonic. If flow mach number is >0.8 but <1.2 then, it is transonic. If flow mach number is in the range of 1.2-5.0 then, it is supersonic. If flow mach number is <5.0 then, it is hypersonic.

Recently Updated in Aircraft Design Questions

Which of the following is not part of tail?

Aileron

Rudder

Elevator

Horizontal stabilizer

Correct Answer : Option (A) : Aileron

Explanation : Aileron is part of the wing. Rudder is part of vertical tail. Elevator is part of the horizontal tail. Horizontal tail is also called Horizontal stabilizer.

The inverted V-tail is used to ______

to reduce adverse yaw-roll

to increase lift

to increase thrust

to provide adverse yaw-roll

Correct Answer : Option (A) : to reduce adverse yaw-roll

Explanation : Inverted V tail arrangement is used to prevent the adverse yaw roll motion. Lift can be increased by flaps. Thrust is increased by an engine.

What is the use of V type tail?

To produce thrust

To increase wetted area

To reduce wetted area

To prevent adverse yaw roll

Correct Answer : Option (C) : To reduce wetted area

Explanation : V tail arrangement is used to combine horizontal and vertical tail. It combines in such way that the wetted area reduces. However, it generates adverse yaw roll motion. To prevent such effect inverted V tail can be used.