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Hey Stormin: (I know it is Normin but I
couldn't resist) I recommend that you check the full travel of your trim
tab. I suspect it is not getting the travel it should. The trim tab travel range
is zero degrees up and 60 degrees down, which assumes your elevator is set for 9
degrees up and 12 degrees down. Also, make certain you have not added anything
that moves the CG aft, because this would create an impact on the
trim.
If you have the elevator limits improperly set to
13 degrees up and 12 degrees down then the trim tab may have to be adjusted to
compensate. (I have seen several D models with the elevator limits set
improperly)
When you turn the trim knob all the way out, it
should pull the trim tab approximately 60 degrees down. Conversely, when you
turn it in, it should push the trim tab to a level position against the trim tab
stop. If you check that and find the cable does the job, then you have something
else that has changed.
I find that often, the trim wire corrodes slightly
which makes it more difficult to push it the full travel. Spraying some
penetrating lubricant on the outside of the housing in the area between the
elevator and the stabilizer as well as in the stabilizer (You must remove the
tail cone and have a strong sprayer to get the area lubricated in the
stabilizer) will quite often solve the problem. Also, lubricating the trim tab
hinge may help the problem. If the lubrication does not help, you
may have to change the wire (and lube it well when you put it in)
Lynn Nelsen
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