----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]----
Yup, it was a trick question, but someone was on the ball! Old Paul Prentice asked Fred about this wing bolt torque value one day and Fred didn't have a specific answer, except that he wouldn't put a value on it. Ever since that we've just cranked 'em down tight and it's probably right where the torque value is supposed to be! ----- Original Message ----- From: "Bob Saville" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Sunday, December 24, 2000 1:39 PM Subject: Re: [COUPERS] loose wing/bolt madness > Hi Al. > I can't find it in any of my manuals either. Check with an AP, he should have the chart that I've > seen 'somewhere' that gives torque values for each size of AN bolts. If there isn't a specific value for > the application (such as cyl base bolts, exhaust, etc) then I guess the 'master chart' for bolts by size > would be the fallback rule. (Just guessing as that's about all I'm qualified to do.) > Have a nice Christmas......... > > Bob Saville > > A J DeMarzo wrote: > > > ----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]---- > > > > 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 > > __________________________________________________ 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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