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  #1  
Old 10-11-2018, 07:38 PM
iamtheari iamtheari is offline
 
Join Date: Nov 2017
Location: ND
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Default Page 29-12 - Why rivet stuff to side skin before clecoing it to fuselage?

Page 29-12 has you rivet about 1/3 of the holes in two ribs, 3/4 of the holes in one stiffener, and a handful of holes in the side plate and upper drag fitting to the side skin before putting the skin on the fuselage. Is there a reason for this? It seems like back-riveting would be the way to do it but I have had much better results riveting things in place rather than backriveting.
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Old 10-11-2018, 09:08 PM
Aluminum Aluminum is offline
 
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Location: San Jose, CA
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Quote:
Originally Posted by iamtheari View Post
Page 29-12 has you rivet about 1/3 of the holes in two ribs, 3/4 of the holes in one stiffener, and a handful of holes in the side plate and upper drag fitting to the side skin before putting the skin on the fuselage. Is there a reason for this? It seems like back-riveting would be the way to do it but I have had much better results riveting things in place rather than backriveting.
I deviated from Van's sequence here pretty much as you described: back-riveted everything working my way out from the upper drag fitting with the skin on the fuselage. Came out neat, no pillowing. Front-riveting always results in a bit of warped optics on these large flat sheets.

Back-riveting is much easier with two people. Cleco everything together then throw a bucking party for your EAA chapter.
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Old 10-11-2018, 11:19 PM
iamtheari iamtheari is offline
 
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Sorry, I wrote that in a confusing way. To do things in the order presented in the plans, back riveting seems mandatory. I prefer not to back rivet if I can help it, especially with AD4 rivets. Good thing I learned that lesson on something you wonít see if youíre not looking for it.

Putting things on the plane and then riveting them from the front would be my preference. But if there is a reason to rivet these things together off the plane, I will do that instead.
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Old 10-12-2018, 10:25 AM
MED MED is offline
 
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Location: Aiken, SC
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My experience and recommendations from more experienced builders has been, in order of preference: squeeze first, back-rivet second, conventional rivet last.
YMMV.
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Old 10-12-2018, 06:19 PM
Aluminum Aluminum is offline
 
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Quote:
Originally Posted by iamtheari View Post
To do things in the order presented in the plans, back riveting seems mandatory.
Not mandatory, but preferred. See step 8 on 29-14: "Back rivet the flush rivets where practical."

You can convince yourself by taking a highly polished sheet of scrap and riveting it to a rib of sorts using the two different methods. The back-riveted joint will turn out mirror-flat, the front-riveted one will always warp the image toward the rivet similar to under-dimpled skin.

None of this makes any difference from the structural strength perspective.
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