inboard main spar

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inboard main spar

Postby bipbuilder » Wed Oct 12, 2016 8:35 pm

First time onex builder here. Have completed outboard spars and am currently working on the inboard spar assembly. Having difficulty interpreting the drawing and was wondering if anyone could clarify them. Especially having difficulty with the spacer plates on the end and the pivot plates. Additional drawings or photos would be helpful.
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Re: inboard main spar

Postby Mike53 » Wed Oct 12, 2016 8:46 pm

http://www.onexmike.org/spar--inboard.html

Hope this clears it up a little.
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Re: inboard main spar

Postby bipbuilder » Sat Oct 15, 2016 8:55 am

Thanks for the info. About an hour after posting I had an"aha" moment . But the pictures confirmed my revelation. Also when Torque in the an bolts on the spar to 25 inch pounds it didn't seem very tight. Was wondering if that is the right spec.
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Re: inboard main spar

Postby lstinthot » Sat Oct 15, 2016 10:53 am

I thought the same thing about how little the torque value is. Referring to the AC43-13, it also states to not over torque and gives a value of 23 inch pounds for a 10-32 screw and 20 for an 8-32 screw. I watched a video that also mentioned to not get the desire to overtorque. One thing I did read in AC43 was to take into account the running torque so the final torque felt on the shaft would be 23 or 25 inch pounds. I take this to mean if it takes 3 inch pounds to turn the nut, the torque wrench needs to be set at 28 inch pounds to get a torque of 25. Have not found out for sure if that is what it means yet. I have not done final torque of my fasteners yet.
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Re: inboard main spar

Postby n982sx » Sun Oct 16, 2016 8:33 pm

Yes, run on torque is the torque it takes to spin the nut. With nylon insert nuts for AN-3 bolts, I consistently measured them at 7 inch pounds.

So, if you torque them to only 25 inch pounds, that is not enough.
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