VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics


Go Back   VAF Forums > Model Specific > RV-9/9A
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 08-26-2013, 08:21 PM
Future RV 9 Flyer Future RV 9 Flyer is offline
 
Join Date: Sep 2011
Location: Marathon,WI
Posts: 51
Default 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?
Reply With Quote
  #2  
Old 08-26-2013, 08:24 PM
N9331v's Avatar
N9331v N9331v is offline
 
Join Date: Jan 2010
Location: Hampshire, IL
Posts: 276
Default 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.
__________________
Ed Martin
Bluskydtl
RV7
DKB
Donations 1/19 & 6/19
Reply With Quote
  #3  
Old 08-27-2013, 07:23 AM
sbalmos's Avatar
sbalmos sbalmos is offline
 
Join Date: Oct 2011
Location: Liberty Twp, OH
Posts: 641
Default

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.
__________________
Scott Balmos - RV-9A N112SB
Cincinnati, OH, KHAO
Reply With Quote
  #4  
Old 08-27-2013, 09:48 AM
YellowJacket RV9 YellowJacket RV9 is offline
 
Join Date: Oct 2012
Location: Clearwater, FL KCLW
Posts: 1,281
Default

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.
__________________
Chris Johnson
RV-9A - Done(ish) 4/5/16! Flying 4/7/16
Reply With Quote
  #5  
Old 08-27-2013, 10:38 AM
David Paule David Paule is offline
 
Join Date: Dec 2009
Location: Boulder, CO
Posts: 4,435
Default Wide Confusion

See http://www.vansairforce.com/communit...d.php?t=101941 for which one to use where.

Dave
Reply With Quote
  #6  
Old 08-27-2013, 08:23 PM
Future RV 9 Flyer Future RV 9 Flyer is offline
 
Join Date: Sep 2011
Location: Marathon,WI
Posts: 51
Angry fuel tank dies

thanks for the advice,ordered the dies from Cleavland today. dimple the skins and then on to sealing the tanks.
Reply With Quote
  #7  
Old 08-31-2013, 08:49 AM
JENSWAY's Avatar
JENSWAY JENSWAY is offline
 
Join Date: Apr 2011
Location: Pretoria, South Africa
Posts: 17
Question 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?
__________________
It doesn't matter what AVGAS costs, it's worth it...
Reply With Quote
  #8  
Old 08-31-2013, 10:30 AM
Bevan Bevan is offline
 
Join Date: Sep 2007
Location: BC
Posts: 1,674
Default

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
__________________
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
Reply With Quote
  #9  
Old 08-31-2013, 05:09 PM
longranger's Avatar
longranger longranger is offline
 
Join Date: Mar 2007
Location: 45G, Brighton, MI
Posts: 1,867
Default

Quote:
Originally Posted by Bevan View Post
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
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.
__________________
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.
Reply With Quote
  #10  
Old 08-31-2013, 07:06 PM
Bevan Bevan is offline
 
Join Date: Sep 2007
Location: BC
Posts: 1,674
Default

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
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 12:22 AM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.