Imagine doing it by the plans, and going ahead and mounting the WAFs to the ends of the center spars. Now just slide the outer spars right up in contact with the center spars before you intsall the WAFs. I'd bevel the ends just to make them mate nicely. Then just put the WAFs in place and start drilling holes (using a jig, or course). After the two big 3/8" holes are drilled through the wood (because they are no longer out in space), remove the WAFs and open them up enough for some 4130 tubing sleeves the thickness of the spars and T-88 them in place. That keeps the wood from crushing when you torque the WAF main attach bolts. It reduces parts count by having one bolt all the way through, rather than two bolts (one on forward side, one on aft side). That's where the single/double shear thing comes in. There might be a better variation of the method....but the above description should give you the idea of what Jerry is asking, I think.
I'm not saying anybody should do it this way, but I'll study it closer and probably build my next one in a similar manner... Mark Langford, Huntsville, Alabama see KR2S project N56ML at http://home.hiwaay.net/~langford email to N56ML "at" hiwaay.net
