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  #1  
Old 10-05-2022, 02:11 PM
hamblin10's Avatar
hamblin10 hamblin10 is offline
 
Join Date: Aug 2021
Location: Owasso, OK
Posts: 53
Default W-1201A Doubler warning

Does the warning on page 17-02 make sense about protecting the LH wing spar caps from being drilled to #20 by inserting a steel strip? If you do not drill through the stack and open the holes then how are you going to install the BSPQ-5-2 rivets? Thanks!
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Eric Hamblin
Private Pilot/A&P/Aerospace Engineer
RV-12iS in progress. N993EZ
Build 121398
Empennage kit received 8/11/22
Wing kit completed
Fuselage kit ordered 03/07/22
Finish kit ordered 03/18/2022
Owasso Oklahoma

https://eaabuilderslog.org/?s=MYRV12
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  #2  
Old 10-05-2022, 02:24 PM
rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 10,088
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Quote:
Originally Posted by hamblin10 View Post
Does the warning on page 17-02 make sense about protecting the LH wing spar caps from being drilled to #20 by inserting a steel strip? If you do not drill through the stack and open the holes then how are you going to install the BSPQ-5-2 rivets? Thanks!
The purpose of the metal protector strip is so that once the drill bit has drilled through the skins and spar flange (to enlarge the holes for the 5/32" rivets) the drill bit doesn't damage the edges of the spar cap strips that are just a bit further inside the wing.
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Scott McDaniels
Hubbard, Oregon
Formerly of Van's Aircraft Engineering Prototype Shop
FAA/DAR, EAA Technical Councelor
RV-6A (aka "Junkyard Special ")
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  #3  
Old 10-05-2022, 02:33 PM
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hamblin10 hamblin10 is offline
 
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Thanks Scott! It was just strange how it was worded about protecting between the skin and spar cap.
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Eric Hamblin
Private Pilot/A&P/Aerospace Engineer
RV-12iS in progress. N993EZ
Build 121398
Empennage kit received 8/11/22
Wing kit completed
Fuselage kit ordered 03/07/22
Finish kit ordered 03/18/2022
Owasso Oklahoma

https://eaabuilderslog.org/?s=MYRV12
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  #4  
Old 10-05-2022, 03:29 PM
rvbuilder2002 rvbuilder2002 is offline
 
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Location: Hubbard Oregon
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Originally Posted by hamblin10 View Post
Thanks Scott! It was just strange how it was worded about protecting between the skin and spar cap.
In technical terms (at least in regards to our naming conventions at Van's), the spar cap is the heavy structure material (in the case of the RV-12, the laminated layers of bars) along the top and bottom edges of the spar.
The spar flange is the flanged portion of the spar channel, that the skins rivet too.

On some aircraft the spar flange and spar cap are the same thing, but that is not the case on any RV wing spar (prior to the RV-15 at least )
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Opinions, information, and comments, are my own unless stated otherwise.
You are personally responsible for determining the suitability of any tips,
ideas, etc. obtained from any post I have made in this forum.


Scott McDaniels
Hubbard, Oregon
Formerly of Van's Aircraft Engineering Prototype Shop
FAA/DAR, EAA Technical Councelor
RV-6A (aka "Junkyard Special ")
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  #5  
Old 02-03-2023, 08:41 PM
BryanStearns BryanStearns is offline
 
Join Date: May 2021
Location: Portland, OR
Posts: 25
Question Double-checking

Iím about to do this step, and just want to double-checkÖ I donít think Iím correctly visualizing where the strip has to go to protect the spar cap while still allowing me to enlarge the flange holes.

Iíve got the doubler clecoed to the skin and spar flange, all the holes lined up and everything looks right. However, on the left wing the drill bit will emerge almost an inch from the spar web aft face, and nearly parallel to it; on the right wing itís much closer, ~1/8Ē, but thereís still no danger to the spar cap (the bottom of the web, right?) if I drill perpendicular to the doubler/skin/flange.

I donít see how the steel strip will help, since it has to be pretty narrow to avoid blocking the (enlarged) holes aft of the spar that Iím enlarging, as well as the ones fwd of the spar that Iíve filled with clecos. If I do put the steel strip in place on the right wing and drill 10 or so degrees off perpendicular, the point of the bit will still miss the strip before it scratches the aft side of the spar web (or those fat pre-set rivets). It would only save me if I accidentally started a new hole forward of the holes Iím enlarging.

Does this sound right?

(Iím asking partly because neither I nor my local big-orange-box hardware store have any <.040Ē steel sheet handy, and I donít want to take more time searching for it unless I know where to put it thatíd help protect me.)

Thanks!
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  #6  
Old Yesterday, 07:47 AM
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BobbyLucas BobbyLucas is offline
 
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Location: Belleville, MI
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Quote:
Originally Posted by BryanStearns View Post
...on the left wing the drill bit will emerge almost an inch from the spar web aft face, and nearly parallel to it; on the right wing itís much closer, ~1/8Ē, but thereís still no danger to the spar cap (the bottom of the web, right?) if I drill perpendicular to the doubler/skin/flange.
Bryan - I had the exact same confusion, glad I'm not alone!
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