Discussion
Statement I: Engine failure on a multi-engine aeroplane is usually the critical case for rudder sizing.
Statement II: The asymmetric thrust moment must be balanced at the lowest speed at which flight continues.
In the light of the above statements, choose the correct answer.
Answer: C
Correct answer: Both Statement I and Statement II are correct
Both are true and the second explains why the first is so. The asymmetric thrust moment is set by thrust and engine offset, neither of which falls with airspeed, while the rudder's opposing moment falls with dynamic pressure and hence with the square of speed.
So the binding condition occurs at the lowest speed at which flight must continue after the failure, and that is what fixes the rudder size. A crosswind landing is the other case examined, but on a multi-engine aeroplane the engine-out moment is usually the larger, so it governs the design.
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