Duncan,
In my Vortex Generator tests and more recently the stall tests with different
sized
leading edge stall strips I found the plane to react quite differently with
any significant change.
In tuft testing, placing tape and tufts at the 50% chord point significantly
changed
the deep stall and cruise trim characteristics.
Another really annoying thing is for those who built their ailerons true to
design
and have a slight concave surface on the aileron upper side, any water or
frost still on the aft trailing edge is noticed in trim. I use a #10 wood
pencil
or soda straw for initial trimming simply taped as a ramp to the aileron.
It is amazing what a small amount of change as a 4 inch tab can affect roll
trim.
I had 12AY down for a month after a local Instructor pilot flew my plane on a
short
cross country and reported back that it too an annoying amount of rudder
to keep it straight.
I checked everything. It appears the plane was left outside in a strong
thunderstorm
and the rudder was banging around which caused a slack rudder cable turnbuckle
to flip the cable thimble around which shortened one cable about 1/2 inch.
Best Regards,
Bud Yerly
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