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Date:  6-8-2018
Number of Hours:  1.00
Manual Reference:  
Brief Description:  Cleco front spar assembly and ribs to skin

The assembly from last session was carefully lowered into the skin and clecoed into place. Everything lined up perfectly with a little nudging and I got it all done in about an hour. The pneumatic cleco gun I bought really showed its worth and made the job easier.

The rear spar center hinge was also attached to the rear spar with AN3 bolts and MS21042 lock nuts per the plans. This was the first time I got to use my new torque wrench and it didn't go well. The click signifying you've reached the proper torque is easy to miss. I managed to break one of the bolts from overtorquing. I'm pretty sure I overtorqued the other bolts too, so I removed them all and used new nuts and bolts for another try.

Before I installed the new bolts I reread Section 5 of the plans. Even though the torque spec says torque to 28 in-lbs for AN3 bolts, it also says you need to add the torque required to overcome the friction of the nut. Normally, this means you need to measure the load on the end of the torque wrench and calculate the torque. Fortunately, they gave an example using the very same AN3 bolts/MS21042-3 nuts and said their experiments showed you must add an additional 14 in-lbs for the friction for a total torque of 42 in-lbs. I just used their numbers and set the bolts.

Nothing left to do now but rivet everything together!
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Everything but the rear spar is in place for riveting.

Everything but the rear spar is in place for riveting.

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The clecos are where one of the internal nose ribs attaches to the front spar with blind rivets.

The clecos are where one of the internal nose ribs attaches to the front spar with blind rivets.

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The end nose and inspar ribs can be squeezed.  All other require a rivet gun and bucking bar.

The end nose and inspar ribs can be squeezed. All other require a rivet gun and bucking bar.

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