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RE the concave elevators: I would recommend against filling the concavity,
simply because it will make the mass balancing of those surfaces more
difficult, as well as increasing the mass moment of inertia (MMOI) of the
elevator system: more weight on the skins, relatively far from the hinge
point, and the additional weight in the counterbalances to compensate. I
don't have the numbers for that airframe, but elevator flutter is a real
concern in high speed aircraft, and it is effected by (among other things)
control system stiffness and surface MMOI.
Further, the elevator concavity could noticeable affect the control response
and linearity of the elevator system, potentially leading to premature
separation at high deflections. That might be made worse by the asymmetry of
the concavity.
My recommendation would be to convince Lancair to sell you the components
necessary to build a new set of elevators, and take the current ones and
mount them over your fireplace as a reminder: "There's never time to do it
right, but there's always time to DO IT OVER!
Jack Kane
EPI, Inc.
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