Discussion
A crosswind landing is a critical case for rudder power because
Answer: B
Correct answer: The aeroplane must be de-crabbed at low speed
On approach the aeroplane is crabbed into wind to track the centreline. Before touchdown the pilot must yaw it straight so that the wheels are aligned with the runway, and that de-crab happens at the lowest speed of the whole approach.
Rudder moment falls with the square of speed, so the demand is at its greatest precisely where the authority is at its least - which is what makes the case critical for rudder sizing. The fin does not stall in a normal crosswind, and the rudder remains effective; the difficulty is the amount of yaw required at low dynamic pressure.
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