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My aileron trim is via springs attached to the bottom of
each stick which connect at their other ends to a 1/16" cable. This cable comes
from the spring at each side, turns 90 deg up into the console, 90 deg
in, then are wound several times around a phenolic drum. The drum is turned
via a knob through the top of the console through a 3:1 ratio. Spring trim
deflects the ailerons the required amount to balance the spring force. The
ailerons will deflect more at low speed and less at high speed. This means that
a lateral unbalance, once trimmed, will stay trimmed regardless of speed, so you
don't have to increase aileron deflection as you slow down to land; it does it
automatically!
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