Consider a NACA 2812 airfoil. It is operating with flow velocity of 900m/s with chord of 1m. What should be the maximum thickness of this airfoil?

28.12m

0.9m

0.12m

Correct Answer : 0.12m

Explanation : NACA-4 digit series is used to define certain airfoil characteristics.
Here, velocity = 900 m/s, chord = 1m
From NACA-4 digit,
Maximum thickness = last two digits in percent of chord=12% of chord = 0.12*1 = 0.12m.

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Which of the following is not part of tail?

Aileron

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Correct Answer : Option (A) : Aileron

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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

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