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countersinking baffle holes

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william(at)gbta.net
Guest

Posted: Thu Feb 03, 2011 5:10 am Post subject: countersinking baffle holes

On page 18-4 step 6 we countersink the tank skins to  attach the tank baffles to.  It tells us to leave every 10th hole  uncountersunk for alignment issues (these holes are countersunk and riveted  later, after proseal has cured).  I guess I just don't understand why it's  asking us to do this.  Everything is final drilled and should line up  perfectly.  Is it just because of the added mess of the proseal???  Is  this necessary to do or has anyone just countersunk all of them at once.   Seems to me that countersinking and riveting after the proseal has cured is a  sure way to try to make the tank leak.

  

 Thanks

 Bill

   [quote][b]

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rv10flyer

Joined: 25 Aug 2009
Posts: 364

Posted: Thu Feb 03, 2011 5:44 am Post subject: Re: countersinking baffle holes

A dimple or machine countersunk hole is enlarged to the point that your baffle will not seat properly. The seal is made with a nice layer/bead that pushes up in front of baffle bend line as you install it. I am sure some sealing takes place around the rivets too, but your main seal needs to be that inside corner. I just followed the plans, using almost 1 qt per tank. Just before baffles are installed I thinned sealant with toluene/toluol max 15% by wt then went over all joints and rivet shop heads. Then tested tanks to 1 psi with electronic manometer.(Water can be used too).

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_________________
Wayne G.

william(at)gbta.net
Guest

Posted: Thu Feb 03, 2011 12:05 pm Post subject: countersinking baffle holes

Thanks Wayne.  That answered my question.



Bill



--------------------------------------------------

From: "rv10flyer" <wayne.gillispie(at)yahoo.com>

Sent: Thursday, February 03, 2011 7:44 AM

To: <rv10-list(at)matronics.com>

Subject: Re: countersinking baffle holes



 	  Quote: 	
		   



 A dimple or machine countersunk hole is enlarged to the point that your 

 baffle will not seat properly. The seal is made with a nice layer/bead 

 that pushes up in front of baffle bend line as you install it. I am sure 

 some sealing takes place around the rivets too, but your main seal needs 

 to be that inside corner. I just followed the plans, using almost 1 qt per 

 tank. Just before baffles are installed I thinned sealant with 

 toluene/toluol max 15% by wt then went over all joints and rivet shop 

 heads. Then tested tanks to 1 psi with electronic manometer.(Water can be 

 used too).



 --------

 Wayne Gillispie, A&amp;P 5/93, PPC 10/08

 Bldr# 40983 SB Started 12/1/09.

 Fuselage Sec 41 Fwd top fuse skin/panel





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