...what can be done to raise the stick forces, mainly the elevator, to make it less prone to PIO. Also, something like a exponential command would also work.
1. You could balance the elevator. The extra mass may slow down jerking around for PIO. Helps with flutter control also. 2. Move the elevator cables closer together on the stick and/or move the cables on the elevator bell crank further apart. That means more stick movement for less elevator movement. Might not be able to get full elevator travel with this change. 3. Put some centering springs in the elevator circuit. Might get some oscillation or flutter in rough air. 4. Make the Trim Tab into an anti-servo tab so that the tab moves in the direction of the elevator movement. That will tend to center the elevator into the air stream. The effect will be exponential for stick forces. Take care with this change; you could get some bad flutter if the servo is set to aggressive. And even if the elevator is mass balanced. 5. Be certain the CG is towards the forward end of range. Aft CG can make the aircraft non-controllable in pitch. 6. Reprogram the flight control computer between the headset. Skill goes a long way here. A smooth, easy touch is required. Sid Wood Tri-gear KR-2 N6242 Mechanicsville, MD USA [email protected]
