On 4/14/2024 12:19 PM, Adam Deem wrote:
If I recall correctly, the 200mph VNE is because that is the generally
accepted maximum speed assuring a reasonable flutter margin for
unbalanced flight control designs.
Adam Deem
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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
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