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08-26-2013, 08:21 PM
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Join Date: Sep 2011
Location: Marathon,WI
Posts: 51
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Dimpling fuel tank skins
I started to dimple my fuel tank skins and them I heard about Clevelands fuel tank dimpling dies.Are they needed or are the regular 3/32 dies ok?
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08-26-2013, 08:24 PM
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Join Date: Jan 2010
Location: Hampshire, IL
Posts: 276
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Tank dies
I used the tank dies. They make up the difference for the depth of the tank sealant so the rivet does not sit proud.
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Ed Martin
Bluskydtl
RV7
DKB
Donations 1/19 & 6/19
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08-27-2013, 07:23 AM
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Join Date: Oct 2011
Location: Liberty Twp, OH
Posts: 641
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Agreed. Get the fuel tank dimple dies. Even just that little dab of sealant that you will put in every rivet hole makes up the difference.
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Scott Balmos - RV-9A N112SB
Cincinnati, OH, KHAO
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08-27-2013, 09:48 AM
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Join Date: Oct 2012
Location: Clearwater, FL KCLW
Posts: 1,281
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I used them on skin and ribs of my first tank, then I read a bit more about them and heard they were not supposed to be used on the skins, only the underlying pieces, so that's what I did on the 2nd tank. To be honest though, I don't see a difference. Rivets are flush on both skins, so it appears they work as promised, and no leaks.
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Chris Johnson
RV-9A - Done(ish) 4/5/16! Flying 4/7/16
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08-27-2013, 10:38 AM
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Join Date: Dec 2009
Location: Boulder, CO
Posts: 4,435
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Wide Confusion
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08-27-2013, 08:23 PM
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Join Date: Sep 2011
Location: Marathon,WI
Posts: 51
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fuel tank dies
thanks for the advice,ordered the dies from Cleavland today. dimple the skins and then on to sealing the tanks.
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08-31-2013, 08:49 AM
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Join Date: Apr 2011
Location: Pretoria, South Africa
Posts: 17
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TANK SKIN DIES
I don't quite understand- I'm about to dimple my tank skins with the tank skin die. Is the "substructure" die the 3/32 or is there a particular die for the substructure dimple?
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It doesn't matter what AVGAS costs, it's worth it...
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08-31-2013, 10:30 AM
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Join Date: Sep 2007
Location: BC
Posts: 1,674
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I believe the "tank dies" are intended to be used for the under structure, (to make a slightly deeper dimple). Then use the 3/32 die for the skin. The theory is this allows room for some sealant to get trapped in between the skin and the understructure.
Clear as proseal?
One potential problem is that if the skin dimples are not placed directly over substructure dimples prior to riveting, the cleckos will still go through and look right but the rivet may "tip" slightly when set. This will result in one edge of the manfactured head's edge protruding slightly leaving a sharp edge you can feel with you finger. I'm not sure if this was caused by using the tank dies or having proseal involved or both.
Bevan
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RV7A Flying since 2015
O-360-A1F6 (parallel valve) 180HP
Dual P-mags
Precision F.I. with AP purge valve
Vinyl Wrapped Exterior
Grand Rapids EFIS
Located in western Canada
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08-31-2013, 05:09 PM
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Join Date: Mar 2007
Location: 45G, Brighton, MI
Posts: 1,867
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Quote:
Originally Posted by Bevan
I believe the "tank dies" are intended to be used for the under structure, (to make a slightly deeper dimple). Then use the 3/32 die for the skin. The theory is this allows room for some sealant to get trapped in between the skin and the understructure.
Clear as proseal?
One potential problem is that if the skin dimples are not placed directly over substructure dimples prior to riveting, the cleckos will still go through and look right but the rivet may "tip" slightly when set. This will result in one edge of the manfactured head's edge protruding slightly leaving a sharp edge you can feel with you finger. I'm not sure if this was caused by using the tank dies or having proseal involved or both.
Bevan
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The "tank dies" are to be used for dimpling the SKIN to allow room for a thin layer of sealant between the rivet and skin. The "substructure dies" are to be used on the ribs to allow the slightly deeper dimple in the skin to nest properly in the rib dimple.
If you are doing structure other than that which requires sealant you can use the tank dies for dimples in structure for skins dimpled with "standard" dies.
In one instance, the wing walk, I used standard dies in the outer skin, the fuel tank dies in the wing walk doubler, and substructure dies in the ribs.
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Miles (VAF# 1238, Paid up as of 2018)
RV-7 TU 904KM (reserved)
Wings Fitted and Finish Kit on site
Construction Log
Picasa: Empennage Album, Wings Album, Fuselage Album
1955 Cessna 170B flying since 1982
'To get something you never had, you have to do something you never did.' -Unk.
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08-31-2013, 07:06 PM
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Join Date: Sep 2007
Location: BC
Posts: 1,674
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I agree with the previous post and stand corrected. The substructure AND skin would be dimpled with tank dies making a bit of room for sealant under the rivet head. I can't say this works any better than reg dies as the extreme clamping pressure of the rivet should squish out all of the sealant.
Bevan
__________________
RV7A Flying since 2015
O-360-A1F6 (parallel valve) 180HP
Dual P-mags
Precision F.I. with AP purge valve
Vinyl Wrapped Exterior
Grand Rapids EFIS
Located in western Canada
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