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Rear Wing Spar question

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rv(at)thelefflers.com
Guest

Posted: Fri Jul 04, 2008 12:33 pm Post subject: Rear Wing Spar question

On page 15-4 on the Wing manual.  It clearly calls to machine counter sink the top of the rear spar (w-1007a) on the three areas with the three (w-1007d/e) spar doublers.   It also specifically calls to dimple the 26 inboard places on the top and bottom flange on the rear spar.  

   

This isn’t making sense to me.  Perhaps I’m being a little dense (no jokes please) this holiday weekend.  

   

The spar is too think to dimple, so I’m surprised that the instructions don’t specifically call for machine countersinking.    I suspect this is the first area that I’ve run into where the common instructions are omitted, since it doesn’t make any mention of countersinking the other top and bottom holes that mate with the wing skins.  

   

I assuming that machine countersinking the top and bottom flange on the rear spar is the appropriate action.  I guess I’m probably thinking too hard to understand why they want these 26 holes dimpled instead of countersinking.  

   

I’m curious to see what others have done.  

   

Thanks,  

   

Bob  

   

Do not archive  

   

      [quote][b]

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drfred(at)suddenlinkmail.
Guest

Posted: Fri Jul 04, 2008 2:18 pm Post subject: Rear Wing Spar question

Bob;



It's been about year and half and I looked over that section again. I 

think I did get out my big squeezer and dimpled that line on top the 

1007 a. As I remember, the skins would have fit better if they were 

countersinked, as long as you had adequate metal there. My wings are out 

at the hanger so I couldn't look at them. Maybe someone else has some 

more recent recollections.



Dr Fred.

wiring up center console.

Bob Leffler wrote:

 	  Quote: 	
		  

 On page 15-4 on the Wing manual. It clearly calls to machine counter 

 sink the top of the rear spar (w-1007a) on the three areas with the 

 three (w-1007d/e) spar doublers. It also specifically calls to dimple 

 the 26 inboard places on the top and bottom flange on the rear spar.



 This isn’t making sense to me. Perhaps I’m being a little dense (no 

 jokes please) this holiday weekend.



 The spar is too think to dimple, so I’m surprised that the 

 instructions don’t specifically call for machine countersinking. I 

 suspect this is the first area that I’ve run into where the common 

 instructions are omitted, since it doesn’t make any mention of 

 countersinking the other top and bottom holes that mate with the wing 

 skins.



 I assuming that machine countersinking the top and bottom flange on 

 the rear spar is the appropriate action. I guess I’m probably thinking 

 too hard to understand why they want these 26 holes dimpled instead of 

 countersinking.



 I’m curious to see what others have done.



 Thanks,



 Bob



 Do not archive



 *

 *

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carl.froehlich(at)cox.net
Guest

Posted: Fri Jul 04, 2008 2:18 pm Post subject: Rear Wing Spar question

The rear spar does get dimpled.  At .040” it is still thin enough.  

   

Carl Froehlich  

RV-8A (425 hrs)  

RV-10 (fuselage)   

       

From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Bob Leffler

 Sent: Friday, July 04, 2008 4:30 PM

 To: rv10-list(at)matronics.com

 Subject: Rear Wing Spar question  

  

  

   

On page 15-4 on the Wing manual.  It clearly calls to machine counter sink the top of the rear spar (w-1007a) on the three areas with the three (w-1007d/e) spar doublers.   It also specifically calls to dimple the 26 inboard places on the top and bottom flange on the rear spar.  

   

This isn’t making sense to me.  Perhaps I’m being a little dense (no jokes please) this holiday weekend.  

   

The spar is too think to dimple, so I’m surprised that the instructions don’t specifically call for machine countersinking.    I suspect this is the first area that I’ve run into where the common instructions are omitted, since it doesn’t make any mention of countersinking the other top and bottom holes that mate with the wing skins.  

   

I assuming that machine countersinking the top and bottom flange on the rear spar is the appropriate action.  I guess I’m probably thinking too hard to understand why they want these 26 holes dimpled instead of countersinking.  

   

I’m curious to see what others have done.  

   

Thanks,  

   

Bob  

   

Do not archive  

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pascal(at)rv10builder.net
Guest

Posted: Fri Jul 04, 2008 8:07 pm Post subject: Rear Wing Spar question

Maybe I am looking at the wrong piece 1007c is  countersunk and the top and bottom flange of the rear spar are fine to  dimple, you as a builder can make the decision to countersink if you chose but  you are looking at the rear spar..right? shouldn't be a problem to squeeze;   the front.. THAT is too thick.

 I would guess the tip of the wings having the skins  attached over these flanges they (Van's) want that extra level of strength  that dimpling would produce over countersinking.. 



   From: Bob Leffler (rv(at)thelefflers.com) 

 Sent: Friday, July 04, 2008 1:29 PM

 To: rv10-list(at)matronics.com (rv10-list(at)matronics.com) 

 Subject: Rear Wing Spar question

 



  

On page 15-4 on the Wing manual.  It clearly calls to  machine counter sink the top of the rear spar (w-1007a) on the three areas with  the three (w-1007d/e) spar doublers.   It also specifically calls to  dimple the 26 inboard places on the top and bottom flange on the rear  spar. 

  

This isn’t making sense to me.  Perhaps I’m being a  little dense (no jokes please) this holiday weekend. 

  

The spar is too think to dimple, so I’m surprised that the  instructions don’t specifically call for machine  countersinking.    I suspect this is the first area that I’ve run  into where the common instructions are omitted, since it doesn’t make any  mention of countersinking the other top and bottom holes that mate with the wing  skins. 

  

I assuming that machine countersinking the top and bottom  flange on the rear spar is the appropriate action.  I guess I’m probably  thinking too hard to understand why they want these 26 holes dimpled instead of  countersinking. 

  

I’m curious to see what others have done. 

  

Thanks, 

  

Bob 

  

Do not archive 

 

[quote]



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rv(at)thelefflers.com
Guest

Posted: Sat Jul 05, 2008 10:53 am Post subject: Rear Wing Spar question

Thanks to Carl, Fred, and Pascal for getting me by my brain fart this

weekend.  Using the pneumatic squeezer and dimpling worked just fine.

Thanks,



Bob



Do not archive



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John Kirkland

Joined: 13 Jan 2006
Posts: 19
Location: South Weber, UT

Posted: Sun Jul 06, 2008 6:53 am Post subject: Re: Rear Wing Spar question

The W1007D & E doublers have a flange that nests in there. Dimpling may make the doublers not fit tightly, as you will now have to dimple them too.  The dimples may not set inside each other very well due to the material thickness.

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