You state that the strengthof a properly designed wooden spar does not depend on the grain orientation. I believe this is missleading, would you use wood that had a splope on th grain of 1 to 3 or 1 to 5 or 1 to 20?. Jim On Thu, 05 May 2005 09:13:57 -0400 Donald Reid <[email protected]> writes: > At 11:30 PM 5/4/2005, you wrote: > > My personal feeling without seeing how far the hole was > >missed is that it MAY be perfectly adequate to repair the hole by > filling it > >with epoxy (don't know about the dowel with the grain in the > completely > >wrong direction). > > This is a bad idea. Epoxy is not as strong in compression as the > wood. It > would tend to deform and displace which would allow the bolt to > move. > > > >One thing I would look at is what side of the hole will > >the repair be on? I would think that if you missed along the grain > instead > >of accross it that would be better. > > This is immaterial. The strength from a properly designed wooden > spar does > not depend on the grain orientation. The strength depends on the > longitudinal fibers. > > The bolted joint in a wooden structure transfers the load into the > wood by > compression. The force acting on the bolt pushes against the wood > fibers. As long as the applied force times the area being > compressed is > less than the allowable compressive strength of the wood, the joint > is good. > > In the case of a KR main wing attachment fitting, it also acceptable > to > drill certain (meaning only the correct ones) to 1/4 inch. You can > contact > me off the KR network and I will provide appropriate reference > material. If it is done wrong, the attachment will be weaker. Done > right, > it will be stronger. > > > > Don Reid - donreid "at" peoplepc.com > Bumpass, Va > > Visit my web sites at: > > AeroFoil, a 2-D Airfoil Design And Analysis Computer Program: > http://aerofoilengineering.com > > KR2XL construction: http://aerofoilengineering.com/KR/KR2XL.htm > Aviation Surplus: > http://aerofoilengineering.com/PartsListing/Airparts.htm > EAA Chapter 231: http://eaa231.org > Ultralights: http://usua250.org > VA EAA State Fly-in: http://vaeaa.org > > > > _______________________________________ > Search the KRnet Archives at > http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to [email protected] > please see other KRnet info at http://www.krnet.org/info.html > >
