On 4/1/2023 8:53 PM, costewart23 via KRnet wrote:
How much does the KR fuselage need to flex, if any?!?!?
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The KR design is 50+ years old and in the 30+ years I've been a member
of the KR community I've never heard of a fuselage failure other than
when a KR contacted the ground at a high rate of speed. My KR is 24"
longer than standard and was built before the top longeron angled
braces were added to the plans ( or I missed them) and 800 hours of
flight time has not caused it to fail. Thermo insulation is not needed
and the extra weight of added ply is a penalty to performance. The
KR2S, when built to plans, is a very safe and reliable and well
performing aircraft if the size fits the intended pilot and passenger.
The problem is that today's builders have generally outgrown the
airplane in size and weight but not in structure. Stick to the plans
and get it flying. If the plans built airplane does not fit your
intended flight profiles then select another design.
P.S. What the person saying "it needs flex" might have been referring to
was when you add stiffness / structure to an area you stand the chance
of moving stress points to other (unintended) areas and thus possibly
creating new failure points. That is true.
Larry Flesner
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