I'm guessing that is more "general" than safe or correct. The plans
for the KR2 calls for balanced ailerons with a 200 mph red line. I
also had a friend get his legs beat up with rudder flutter in a 100
mph little bi-plane of some type. Just as Ralph Nader declared the
Corvair "unsafe at any speed", so too can unbalanced control surfaces
be unsafe at any speed, totally dependent on design. Several KR's
have been flight tested beyond 200 mph, some by accident, without
balanced control surfaces but is your KR identical in control surface
size, shape, weight, distance from hinge point to T.E., and identical
cable tension? I've watched model aircraft disintegrate in flight from
control surface flutter and it took about 2 seconds. Without testing
we can only hope the designer knew what he was doing and follow the
plans.
Larry Flesner
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Don't overlook the trim tab either. A loose or sloppy trim tab is
capable of flutter also. It was a loose or broken elevator trim tab on
the P51 at the air race that took several lives. I went with a servo
trim tab on the elevator of 211LF to eliminate the slop in a long
adjustment cable. If you can hold the elevator and wiggle the trim tab,
fix it.
Larry Flesner
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