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I installed a trim tab on my elevator, manually operated
by a lever in the cockpit where the spring-type trim lever would be. The trim
tab is operated through nylon-lined bicycle cable type-tubing rather than the
much heavier and stiffer Bowden cable. A trim tab gives a velocity-sensitive
control, whereas the spring-type trim is a balance-sensitive control. However,
my aileron trim is through springs attached to the bottoms of the sticks. This
gives an aileron deflection which increases with decreasing airspeed, so it is
not necessary to readjust aileron trim as you slow down for landing; it is a
force trim. It maintains the same unbalance force regardless of
airspeed. Here's something else to try, at least with the 235 flap
actuator. Connect a spring between the end of the flap actuator and the elevator
push-pull tube. As you lower the flaps, it will give up elevator in proportion.
On mine, once I trim to 100 mph IAS when landing, that speed is maintained
as the flaps are lowered. I think the spring I used is similar to the
main-gear OC-link tension spring.
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