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Here's a good question that has had the N. Texas Coupe Group stunned for years: Where, in any of the manuals, does it state the torque values for the wing bolts? Something to look for instead of opening presents! Have a Great Holiday and a Safe & Happy New Year! Al ----- Original Message ----- From: <[EMAIL PROTECTED]> Subject: Re: [COUPERS] loose wing/bolt madness > The Alon parts manual calls for a standard AN bolt for the wing attach > fittings, and I think all the other models of the plane use the same bolt. > By definition, a standard AN bolt is not a close tolerance bolt - so the fit > of the bolt in the wing attach fittings is not critical (within certain > limits, of course). The wings are held tightly in place by the torque on the > bolt. The torque on the bolt develops friction between the "plates" of the > wing attach fittings. The friction between the plates is what keeps the > wings from moving. > > If the holes in the wing attach fittings are worn, or if the bolts are worn, > then at some point in the life of the plane, those bolts were not torqued > properly. If they were torqued properly, the joint would have no relative > motion in it (because of the friction between the plates), and the parts > would not have been able to move causing the wear. > > If you hear a clunk when you lift your wing, and IF that clunk is coming from > the wing attach fittings, then in all probability it is because the bolt is > not properly torqued. > > The design and theory behind bolted joints is thoroughly discussed in > mechanical engineering text books if anyone wants to look it up. > > And of course.... all of this is just my opinion, so take it for what it's > worth. I would consult with an aeronautical engineer before I did anything > to change the design of the wing attach joint. In my opinion, if worn parts > are found, then they need to be replaced with factory original parts, not > rigged with sleeves or wrapped with shims. > > Good Flying, > > Wayne DelRossi __________________________________________________ To unsubscribe from this list please send mailto:[EMAIL PROTECTED] ___________________________________________________________ T O P I C A http://www.topica.com/t/17 Newsletters, Tips and Discussions on Your Favorite Topics
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