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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: 50
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 in work 07/11/22
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
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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
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 in work 07/11/22
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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Quote:
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 )
__________________
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
RV-6A (aka "Junkyard Special ")
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