KR>Re: Spar bolts/nuts

[Mark Langford]

There's no need to torque the crap out of any of the wing attach 
fittings through the spars, or even WAF to WAF, for that matter.  They 
are simply "pin joints" in engineering terms, meant to keep things from 
moving around.  Friction is not even considered when analyzing the 
stress on these things, even in the case of the WAF to WAF connections. 
 NASA doesn't even consider friction in stress analysis of critical 
structures, at least that's been my experience.  If you start crushing 
wood, you're over tightening.  Don't bother with torque charts....that 
is not the proper "case" for these bolts, given that they can easily 
crush the spruce.

Mark Langford
Mechanical Engineer....RETIRED!
m...@n56ml.com
http://www.n56ml.com
Huntsville, AL
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