Having just had a quick peek in Scott Stoops' book, I will take a stab at this. KE is a side slip manuver, therefore adverse yaw comes into play. Level flight (and coordinated turns) are not side slip manuvers subject to the effects of adverse yaw. Years ago I remember reading in aviation texts about the spiral slipstream. There were line drawings depicting the airflow around the fuselage, having main effect on the rudder (or the stab acting as rudder in KE).; it is not so much an aerodynamic effect on the wings as I recall so no real need to trim ailerons for effects of spiral slipstream, or elevators for normal, coordinated flight regimes such as landing. The aero jargon is not so much to blame as the engineers who wrote the aerodynamics I guess, LOL. Happy to stand corrected if I misunderstood these texts or the question at hand. Cheers! Dana
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