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03-10-2016, 12:01 AM
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Join Date: Dec 2005
Location: San Pedro
Posts: 1,013
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1/8th Inch Holes in Main Spar
Working on the skeleton of the left wing. Have all of the ribs clecoed into position.
There are a few evenly spaced 1/8th inch holes factory drilled into the spar between the first and second ribs that to me, have no function. That is, I can see thru the spar and these holes anchor nothing to the spar. I have closely reviewed the plans and clecoed on the bottom skins. The bottom skins fit perfectly so I'm 99% sure that I have the ribs mounted to the main spar correctly.
But, I'm concerned that I have missed something. Please advise - thanks in advance.
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Building finally
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03-10-2016, 12:26 AM
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Join Date: Feb 2010
Location: Sydney, Australia
Posts: 68
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Are these the holes that get riveted on page 13-03/Step 5?
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03-10-2016, 01:46 AM
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Join Date: Dec 2005
Location: San Pedro
Posts: 1,013
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Thank you Alex!
I think that you nailed it - now I think that I understand the instruction as to those few holes. It looks to me like the function of the rivets in these holes is to help hold the laminations of the main spar together. Do you concur? Alex, I appreciate your immediate and informative response.
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Building finally
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03-10-2016, 04:50 AM
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Join Date: May 2010
Location: Spring Hill Fl
Posts: 734
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Right or Left
I think the holes are from making the parts so they can be used on the right
or left wing
My View
Joe Dallas
Quote:
Originally Posted by E. D. Eliot
Working on the skeleton of the left wing. Have all of the ribs clecoed into position.
There are a few evenly spaced 1/8th inch holes factory drilled into the spar between the first and second ribs that to me, have no function. That is, I can see thru the spar and these holes anchor nothing to the spar. I have closely reviewed the plans and clecoed on the bottom skins. The bottom skins fit perfectly so I'm 99% sure that I have the ribs mounted to the main spar correctly.
But, I'm concerned that I have missed something. Please advise - thanks in advance.
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03-10-2016, 08:41 AM
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Join Date: Sep 2006
Location: Windsor, California
Posts: 920
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You will find various factory-drilled holes that seemingly have no function in your build. Typically, these holes are used by the factory during the initial manufacturing of the parts ("tooling holes") or, as noted above, reflect the factory's manufacture of one part that can be used for both left and right pieces (e.g., spar webs). Usually all you need to do with these unused holes is debur them like any other hole. I like to think of these extra holes as "lightening holes"! 
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David Heal - Windsor, CA (near Santa Rosa)
EAA #23982 (circa 1965) - EAA Technical Counselor and Flight Advisor; CFI - A&I
RV-12 E-LSA #120496 (SV w/ AP and ADS-B 2020) - N124DH flying since March 2014 - 940+ hours (as of September 2020)! 
V AF donation through June 2021.
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03-10-2016, 09:33 AM
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Join Date: Dec 2005
Location: San Pedro
Posts: 1,013
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Thank You All
Thanks to all who responded. I appreciate your help.
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Building finally
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03-10-2016, 12:00 PM
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Join Date: Aug 2010
Location: Irvine, CA
Posts: 416
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Ed, Joe is right. All the spar webs are punched alike. Some holes go unpopulated depending on whether it ends up as left or right.
Happy building!
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John Halcrow
Tustin, CA
RV-12 120682
Emp/TC done; Wings done; Fuse kit done
"History teaches us that men and nations behave wisely once they have exhausted all other alternatives." --Abba Eban
Paid up until Aug 2021
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03-10-2016, 12:30 PM
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Join Date: Nov 2009
Location: Independence, OR
Posts: 316
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Joe and John are correct. When I was building the wings I called Vans tech assistance and that was the answer I received.
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John Horn (donated for 2020)
Independence, OR
LSRM-A, CFII
Rotax Service, Maintenance, and Heavy Maintenance Trained
Building an RV-12, N7878H reserved
Flying a Flight Design CTSW
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03-10-2016, 01:54 PM
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Join Date: Dec 2005
Location: San Pedro
Posts: 1,013
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PM to John
John, please check your VAF personal mail box - and thank again, Ed
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Building finally
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03-10-2016, 07:23 PM
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Join Date: Aug 2015
Location: Lopez Island, Wa.
Posts: 178
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watch out
Watch out for one odd rib, look very closely at plans to see rib that is facing opposite direction on wings...think the left wing rib goes on right wing and vice versa...do not quote me..but I just had to take that rib out and change sides...very hard to see on plans and no big warning on plans...but if you get it all done and skin does not line up..you have it wrong...
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Retired Firefighter/Para-Medic
Sold 182 Skyelane
sold Super Cub
Building RV 12 E-LSA
Paid thru 2016, even though exempt
RV 12 completed, waiting DAR
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