Discussion
Assertion (A): The demonstrated crosswind for a type is often set by rudder power.
Reason (R): De-crabbing at touchdown demands a large yawing moment at the lowest speed of the approach.
Select the correct answer from the options below.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason explains the assertion. The crab angle held on approach must be removed at touchdown so the wheels align with the runway, and that de-crab is a yaw demanded at the lowest speed of the whole approach.
Rudder moment falls with the square of speed, so the demand peaks where the authority is least. The crosswind at which the rudder can just achieve it sets the demonstrated crosswind for the type. Note that the figure is a demonstrated value rather than a structural limit - but where rudder power is what limits it, the number is a genuine aerodynamic boundary.
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