Hi Jeremy,

I don't think you necessarily need them but, many of us prefer them.

I usually run 3. Takeoff - which gives me more elevator, reduced steering, half flap, increased gyro gain. Normal- which reduces elevator, reduces gyro gain, maybe reduces aileron depending on the plane and gives full nose wheel steering for taxiing . Landing,- which again increases gain, reduces steering, drops full flaps, increases elevator. Of course all conditions are trimmed independantly so, no need to make numerous flights to get a flap elevator mix right.

I like to be able to change all that stuff on 1 switch.

Mike



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