> So then I believe the new spar was found to be about 18% stronger than the > old one, so add 18% to the gross load? 1239# rated load? 1200 with safety > margin?
I don't think you can make that leap. The spar is 18% stronger, but that's not how it'll fail. It's the compression of the wood fibers where the WAF bolts bear on the spar caps. So if the standard wing has WAFs centered on 6", and your new wing has WAFs centered on 7", then you might get away with putting 17% more load on them (7/6). I guess that's splitting hairs though. And this is all assuming that you haven't surpassed the strength of some other member somewhere first.... Mark Langford, Huntsville, AL N56ML "at" hiwaay.net see KR2S project at http://home.hiwaay.net/~langford
