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    Like several others I found that the aileron trim tab that was made of
hinge and extended beyond the normal trailing edge to be incompatible with
the rest of the lines on my IV.  We recently addressed this problem by
mounting the mac 9 servo through the aileron spar, the body of the servo lies
half way ahead of the spar and is secured by a bracket.  It is still
accessible through the same access panel.  The horn for the tab is just
slightly higher than the bottom of the skin, and the coupler to the crank as
it arcs over the hinge line needed a lot of room carved out of the aileron
skin.  We will cover both with a little cosmetic cover.  We sized ours to 1.5
by 7 inches, so the size recommended by Brent Reagan is now accepted as the
correct one; I recall talking to Brent a long time ago and that may be how
the size was finally determined.  Brent's information has served me very well
over the years.
    It seems that we also made some changes in the aileron ribs to
accommodate the change in the placement of the servo in the spar to carry the
loads to the skin.
    Yes, it can be done, I can put some of the pictures on the web site
Rainbowaviation.com if anyone is interested.  Final caveat:  We are still
building, not flying, so the tale of what we chose to do is untested.

Ross  Walters Turbine Lancair IV
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