Discussion
Which of the following is not a critical case for rudder power?
Answer: D
Correct answer: Cruise in still air at altitude
Cruise in still air makes no demand on the rudder: thrust is symmetric, there is no crosswind, and the aeroplane flies in balance with the surface near neutral.
The other three share a shape - a large yawing moment to be balanced at low airspeed, where dynamic pressure and therefore rudder moment are least. Engine failure just after take-off and continuing a take-off after a failure are the airborne and ground versions of the asymmetric thrust case, giving \( V_{MCA} \) and \( V_{MCG} \); de-crabbing in a limiting crosswind is the other classic case.
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