On 4/4/2020 8:16 AM, Mark Langford via KRnet wrote:
As for spar tests, please take a look at the 2008 KR Gathering website
at http://www.krnet.org/mvn2008/ , about a third of the way down, for
a spar test conducted at the 2008 Gathering.
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It's been awhile since I've looked at the plans but I recall the wings
have a "design" rating of 7G's at 800 pounds (=5600lbs). Marty Roberts
had a KR that weighted 760+ as I recall so his flying weight would have
been 1000+ lbs and he claims to have pulled 6 G's (registered on a G
meter) without wing failure. At the Red Oak, Iowa Gathering he pulled
enough G's that the baggage area structure behind the seat broke loose
and interfered with the elevator cables making for an exciting landing.
His first words after landing and exiting the KR were "I'm done flying
for today. Where is the beer"? I sure do miss Ol' Marty.
I've seen several crashed KR's over the years and the wing attach
fittings remain intact after the spar caps and structure disintegrate.
Built correctly the attach fittings are one of the stronger structures
in the wing. They will bend on impact but I have yet to see them or the
attach point fail.
As always, your results may differ. Don't crash one to test it.
Larry Flesner
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