VansAirForceForums  
Home > VansAirForceForums

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

- Today's Posts | Insert Pics

  #1  
Old 12-06-2013, 10:25 AM
togaflyer togaflyer is offline
 
Join Date: Apr 2013
Location: Southeast
Posts: 663
Default Riveting VS rear spar

Countersink or not. The VS rear spar flange, the lower rivet holes, below the skin, plans state you use AN 470 rivets. A neighbor who built a RV10 recommends countersinking and using the 426's for the hole below the skin. He said you have better shear strength. I called Vans are their technician said stay with the plans. Has anyone countersunk those holes. What are your recommendations.
Reply With Quote
  #2  
Old 12-06-2013, 12:30 PM
majuro15's Avatar
majuro15 majuro15 is offline
 
Join Date: Feb 2013
Location: Charlotte, NC
Posts: 659
Default

Stick with the plans.
__________________
www.N1017H.com
Tim Huneycutt, Capt, NCANG
PC-12 Pilot
N1017H RV-10 Flying 2019
EAA #: 1106970
2020 VAF Dues Paid!
Reply With Quote
  #3  
Old 12-06-2013, 04:11 PM
BobTurner BobTurner is offline
 
Join Date: Dec 2011
Location: Livermore, CA
Posts: 6,797
Default

You get better shear strength when you nest 2 dimpled pieces together. That doesn't happen with counter sinking. What is happening is you're taking metal out of the spar.
Stick with the plans on anything structural, unless you are certain of what you're doing.
Reply With Quote
  #4  
Old 12-06-2013, 08:19 PM
mvidalr's Avatar
mvidalr mvidalr is offline
 
Join Date: Aug 2011
Location: Monterrey, Mexico
Posts: 121
Default dimple

Quote:
Originally Posted by majuro15 View Post
Stick with the plans.
+1

specially the spars which are, for obvious reasons, structural components.
__________________
Miguel Vidal
EAA #1133587
RV-8 SB Wings in Monterrey, Mexico
N511MV Registered
MyKitLog
Reply With Quote
  #5  
Old 12-07-2013, 05:50 AM
togaflyer togaflyer is offline
 
Join Date: Apr 2013
Location: Southeast
Posts: 663
Default

I'm sticking with the plans, thanks.
Reply With Quote
  #6  
Old 12-14-2013, 01:33 PM
dspender dspender is offline
 
Join Date: May 2009
Location: Bay City, MI
Posts: 421
Default

Stick with the plans.
__________________
Dennis
Reply With Quote
  #7  
Old 06-01-2014, 09:27 PM
Jake14 Jake14 is offline
 
Join Date: May 2014
Location: Seattle
Posts: 323
Default VS rear spar countersink question..

The plans (RV-14) call for countersinking the VS rear spar doubler to attach it to the (dimpled) rear spar. As a first-time builder I'm trying to get the correct countersink depth on the rear spar doubler. I'm practicing on scrap Aluminum.

When I use the manual's instructions on countersink depth (7 clicks beyond the flush rivet-head depth) and test fit the dimple into the countersink, the dimple is a long way from being fully into the countersink. When I put the rivet in and set it, then hold up the pieces to the light, there's still a small gap between the 2 sheets, the countersink is just too shallow to absorb the dimple. In fact, it's obvious that the amount of material in the dimple won't all fit into the small countersink volume, and the dimple material which won't be absorbed into the countersink will just serve to push the 2 surfaces apart. Again, as a first-time builder, excuse my ignorance, but I want to be sure the 2 surfaces are in good contact, which would seem a strict requirement for structural reasons.

What am I missing?

PS When I fit 2 dimpled surfaces together, the dimples still don't nest completely, but the riveting process seems to cinch things up nicely, not so in the countersink case.
Reply With Quote
  #8  
Old 06-02-2014, 02:36 AM
paul330 paul330 is offline
 
Join Date: Feb 2007
Location: Mpumalanga, South Africa
Posts: 1,065
Default

Depth depends on the thickness of the dimpled sheet. I made some dimpled gauges of various materials (015, 020, 032) and used them to test the fit of my countersinks.
__________________
Paul
Mercy Air, White River FAWV
RV-10 ZU-IIZ - "Zeus"
Building Bearhawk Bravo - RV-18 not available
2019 Donation Made
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 02:01 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.