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05-07-2014, 10:16 AM
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Join Date: Mar 2014
Location: Laguna Hills, CA
Posts: 1,805
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Forward spar on vertical stab
Hi guys,
Did you use dimple dies or machine countersinking on the VS forward spar? The gauge of aluminum is kind of an in-between thickness, and I'm not sure how to proceed. Thanks!
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Doug
RV-9A "slider"
Flew to Osh in 2017, 2018 & 2019! 
Tail number N427DK
Donation made for 2020
You haven't seen a tree until you've seen its shadow from the sky -- Amelia Earhart
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05-10-2014, 01:50 PM
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Join Date: Jul 2007
Location: Eugene, OR
Posts: 122
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Dimpled
I had a pneumatic squeezer and dimpled. Just one case
Good Luck!
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Alan
RV-9A N984AW
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05-10-2014, 02:45 PM
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Join Date: Oct 2013
Location: martinsburg, wv
Posts: 31
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I dimpled also.
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David
Martinsburg, WV
RV-7 Flying
RV-4 Under Construction
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05-10-2014, 04:48 PM
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Join Date: Jan 2005
Posts: 626
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The parts list I have indicates that the Vertical Stabilizer Front Spar VS-702 is .032. I dimpled mine.
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05-10-2014, 06:26 PM
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Join Date: Nov 2012
Location: Yulee, Fl
Posts: 64
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Pneumatic squeezer and dimpled mine as well.
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Jimmy Black
RV-9A
Started Finished 10/16/14
Wings Finished 4/9/16
Fuselage working electrical
Finishing Kit received 9/11/19
HWY
VAF paid 2019
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05-11-2014, 04:28 PM
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Join Date: Mar 2007
Location: 45G, Brighton, MI
Posts: 1,867
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I don't know about the -9, but in the manual for the 7, Chapter 5 on construction processes says the thinnest material than can be machine countersunk is 0.032, but recommends dimpling 0.040 and thinner. The only exception I've run across so far is on the aft row of rivets attaching the fuel tank skin to the rear baffle, where they have you countersink the skin to make the insertion of the baffle easier. I have read where some builders even dimple these holes without issue.
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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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05-12-2014, 03:49 PM
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Join Date: Mar 2014
Location: Laguna Hills, CA
Posts: 1,805
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Thanks for all the replies, guys. I ended up dimpling with a pneumatic squeezer, and the dimples formed nicely. I guess with that thickness you could go either way, but I'm glad I dimpled.
It gave me a chance to pull out the micrometer and reacquaint myself with reading it. 
__________________
Doug
RV-9A "slider"
Flew to Osh in 2017, 2018 & 2019!
Tail number N427DK
Donation made for 2020
You haven't seen a tree until you've seen its shadow from the sky -- Amelia Earhart
Last edited by rightrudder : 05-12-2014 at 10:28 PM.
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