For a few pictures and info on a test that was done on some alternatives for the main spars of my "KR construction trainer", see http://flysquirrel.net/wing/spartest.html . Granted, the wing design is considerably different from the KR and it's a strut-braced wing, but if anybody wants to build and test a KR spar, it's not beyond reason to try.
And I know there have been KR builders in European countries that have had to actually load test their KR wings for certification of the design G limits. A search in the KR archives for "load test" would probably turn those up. Oscar Zuniga San Antonio, TX
