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GATE 2025 AE – Question 22

Flight Mechanics & Space Dynamics · Aerodynamic forces and moments, angle of attack and sideslip, high-lift devices, roll, pitch and yaw controls · 1 mark · Multiple choice

A general aviation airplane is in steady and level flight. The airplane is prone to adverse yaw. Which one of the following options best describes the deflections of aileron and rudder to achieve a coordinated right turn?

  1. Left aileron: down; Right aileron: up; Rudder: left
  2. Left aileron: down; Right aileron: up; Rudder: right
  3. Left aileron: up; Right aileron: down; Rudder: left
  4. Left aileron: up; Right aileron: down; Rudder: right

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Show answer and explanation

Correct answer: (B) Left aileron: down; Right aileron: up; Rudder: right

Explanation

To roll right, the left aileron goes down (more lift) and the right aileron up. The down-going aileron also adds drag on the left wing, which yaws the nose to the left, away from the turn. This adverse yaw is cancelled by deflecting the rudder to the right.