The designer of the KR2 listed the never exceed speed as 160 mph without
balanced ailerons,200mph with balanced ailerons.175 knots is about 200 mph.
Never exceed speed would be the speed at sea level on a standard
day,29.92hg at a temperature I don't remember. The more altitude means
lower indicated airspeed but the true airspeed is greater than indicated.
Never exceed speed is the true airspeed of the plane not indicated.My
explanation is not as good as the one you will find in the RV sight but you
get the idea. Flying our experimental aircraft is just that
experimental.Ignore the design info at your own risk.Control surface
flutter is a function of true airspeed not indicated.And remember,anything
I say may be wrong.Tommy W.
On Fri, Jan 12, 2018 at 5:28 PM, Jeff Scott via KRnet <email@example.com>
> Yours would not be the first KR to shed an aileron weight at speed. We've
> seen that before at the KR Gathering in Red Oak back in 2003. The Aluminum
> angle typically used to mount the aileron counterweight is subject to
> fatigue, and can fail at the bend causing it to drop the counterweight.
> Just missing the counterweight at speed can be enough to cause the aileron
> to go into flutter. Your witness seems to confirm what I suspected when I
> first read this account; that the counterweight mount may have failed
> dropping the counterweight and inducing aileron flutter. It was
> recommended at the time to consider either replacing the aluminum angle
> with a 4130 steel angle bracket, or find a way to stiffen or brace the
> aluminum mount to prevent fatigue of the aluminum angle.
> -Jeff Scott
> Cherokee Village, AR
> Cc: "robert gill" <robertg...@live.com.au>
> Subject: Re: KR> KRnet Digest, Vol 6, Issue 12
> Robert Gill
> but a witness has told me the saw something small fall off the plane just
> before it happened traveling at the same speed, can only assume it was the
> mass balance as one is missing (from the still attached aileron).
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