Avio Posted October 1, 2014 Posted October 1, 2014 Was doing some flight practices and noticed that during straight and level flight, as the speed goes above 200 km/hr the coordinator ball starts drifting to the right (about half-ball to right), indicating there is a left yaw. And indeed the heading gradually drifts to the left over time. But this is dual-rotor and as such should fly straight and true, isn't it? Anyone else seen this?
ff4life4 Posted October 2, 2014 Posted October 2, 2014 Nope. You need apply right rudder. Just because its a dual-rotor doesn't mean there wont ever be any yaw forces. The bottom rotor has to fight through the downwash of the rotor above it, thus making it less effective at slower speeds. Only one reason for a difference, I'm sure there are many other aerodynamic forces that I can't remember right now. The manual speaks to some of them as well. Right rudder and Left cyclic are what I always need for forward flight
Avio Posted October 2, 2014 Author Posted October 2, 2014 Thank for that. But I don't seem to see that info anywhere in the manual. On one point -- you mentioned of less efficient lower rotor at <lower> speed. Shouldn't it be at higher speed? At lower speed (below 200 km/hr) the Ka flies straight within no yaw seen. It is only when going above 200 km/hr that the yaw starts showing up.
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