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>Did you install a trim tab and not
need it?  Did you not install one and wish you had?<

M experience with N71JF would indicate that rudder is required during
initial climb, cross wind landings and perhaps steep turns.  It is not
advisable to trim for these modes of flight thus an electric rudder trim
would be useless.

My kit came with a vertical stab that had two problems.  It had more camber
on one side than the other and had a built in twist.  Both needed to be
corrected in order to avoid a built in yaw. I've heard of Lancairs that
would trim with with a tab at cruise speeds but not at other speeds.  I
suspect these machines were not built very straight and would have
benefited by a rudder trim system.  

The correct answer for you depends upon how straight you built your bird.
Assuming that it is straight, plan in the worse case installing a fixed
tab. N71JF needed neither a rudder tab or trim.

Jim Frantz
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Please send your photos and drawings to marvkaye@olsusa.com.
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