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  #1  
Old 06-05-2018, 10:58 PM
mfleming's Avatar
mfleming mfleming is online now
 
Join Date: Sep 2016
Location: Joseph, Oregon
Posts: 289
Unhappy Wing Spar Center Section Fit

-7, standard wing kit, QB fuselage.

I made some measurements today (after Van's tech support closed of course) that have me a bit worried.

I measured my wing spar thickness and my center section width and the numbers don't look good.

Here are the numbers:

Left wing spar top - 1.4450"
Left Center Section top - 1.4080"
difference -.0370"

Left wing spar bottom - 1.4450"
Left Center Section bottom - 1.4270"
difference -.0270"



Right wing spar top - 1.4460"
Right Center Section top - 1.4315"
difference -.0145"

Right wing spar bottom - 1.4540"
Right Center Section bottom - 1.4365"
difference -.0175"

In all cases the center section is to narrow for the wing spar to fit easily.

This is the only thread I found on this issue.

From reading the previous thread it appears that with .010 to .015 one might be able to massage the wing spar into the center section. But .027 / .037 seem a bit much.

Any thought on this until I can call Van's on Wednesday?

Here's some photos where I measured:



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Michael Fleming
Joseph, OR
sagriver at icloud dot com

RV-7 Slider #74572
Started 11/2016
Empennage completed 11/2016 (sans fiberglass)
Ailerons and flaps completed 3/2017.
Wings completed 12/2017 (sans fiberglass)
Started on QB fuselage 01/2018

Last edited by mfleming : 06-06-2018 at 09:41 AM.
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  #2  
Old 06-06-2018, 01:14 AM
PilotjohnS PilotjohnS is offline
 
Join Date: Jan 2016
Location: Los Angeles
Posts: 550
Default The curse of pictures

Hope Vans can solve your problem.

I really appreciate the heads up on this critical measurement.

Looking at the picture, and having completed this step no more than 5 minutes ago, check there are at least 1 full thread sticking thru the nuts on the front and rear center section spar bolts. It is not clear in your picture, but I had to use an AN960- 10L washer on these, instead of the AN960-10 washer( the thicker version)
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  #3  
Old 06-06-2018, 09:28 AM
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jcarne jcarne is offline
 
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Default

I'm very interested to hear what Van's has to say on this one. I would think that the spacing is set by the spacers and mainly the side center section plates.
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  #4  
Old 06-06-2018, 09:53 AM
mfleming's Avatar
mfleming mfleming is online now
 
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Location: Joseph, Oregon
Posts: 289
Default

Quote:
Originally Posted by PilotjohnS View Post
Hope Vans can solve your problem.

I really appreciate the heads up on this critical measurement.

Looking at the picture, and having completed this step no more than 5 minutes ago, check there are at least 1 full thread sticking thru the nuts on the front and rear center section spar bolts. It is not clear in your picture, but I had to use an AN960- 10L washer on these, instead of the AN960-10 washer( the thicker version)
Quote:
Originally Posted by jcarne View Post
I'm very interested to hear what Van's has to say on this one. I would think that the spacing is set by the spacers and mainly the side center section plates.
I called Van's and they are conferring with Gus and will call back
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Michael Fleming
Joseph, OR
sagriver at icloud dot com

RV-7 Slider #74572
Started 11/2016
Empennage completed 11/2016 (sans fiberglass)
Ailerons and flaps completed 3/2017.
Wings completed 12/2017 (sans fiberglass)
Started on QB fuselage 01/2018
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  #5  
Old 06-06-2018, 12:06 PM
terrye terrye is offline
 
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Location: Vancouver, BC, Canada
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Default Wing Spar Center Section Fit

Not at this stage yet, but when I built, I machined some hard Delrin spacers for the spar carrythrough before I riveted it to the fuselage structure. In my opinion Vans instructions are poor here (I think they mention a wood block). The spacing should have a machined spacer and I think Vans should supply it.

However, this doesn't help you. This also happened to a friend of mine, and Vans recommended de-riveting the skin overlap on the bottom of the fuselage, insert the spars (or machined spacers would probably work)and re-rivet the skin overlap.
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  #6  
Old 06-06-2018, 01:05 PM
PilotjohnS PilotjohnS is offline
 
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Location: Los Angeles
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Default another suggestion

I would also suggest you make sure there is absolutely no debris between the spar's shear web and the spar caps that could be making the spar 'thicker'
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WARNING! Information presented in this post is my opinion. All users of info have sole responsibility for determining accuracy or suitability for their use.

Extra dues paid 2018, worth every penny

RV9A- Status: tail feathers done less tips
Wings done less tips and avionics
Fuselage 30%
www.pilotjohnsrv9.blogspot.com
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  #7  
Old 06-06-2018, 06:13 PM
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mfleming mfleming is online now
 
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Location: Joseph, Oregon
Posts: 289
Thumbs up Van's Called Back

So I heard back from Van's.

They thought the numbers I posted earlier were within the tolerances needed to successfully mount the wings.

Chamfer the spar ends and use a block of wood to lever the center section open a bit and I'm good.

It will be a bit before I'm ready to do that, so I won't be reporting back right away.
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Joseph, OR
sagriver at icloud dot com

RV-7 Slider #74572
Started 11/2016
Empennage completed 11/2016 (sans fiberglass)
Ailerons and flaps completed 3/2017.
Wings completed 12/2017 (sans fiberglass)
Started on QB fuselage 01/2018
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  #8  
Old 06-07-2018, 01:03 AM
David-aviator David-aviator is offline
 
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Default

I believe it will be ok also.
Spray the spar mating areas with a little Corrosion X, they will slide together nicely.
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  #9  
Old 06-07-2018, 09:01 AM
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Raymo Raymo is offline
 
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Default

Quote:
Originally Posted by David-aviator View Post
I believe it will be ok also.
Spray the spar mating areas with a little Corrosion X, they will slide together nicely.
+1 for this and also coat the wing mount bolts. Clean the threads prior to torquing.
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  #10  
Old 06-07-2018, 11:02 AM
mfleming's Avatar
mfleming mfleming is online now
 
Join Date: Sep 2016
Location: Joseph, Oregon
Posts: 289
Default

Quote:
Originally Posted by David-aviator View Post
I believe it will be ok also.
Spray the spar mating areas with a little Corrosion X, they will slide together nicely.
Quote:
Originally Posted by Raymo View Post
+1 for this and also coat the wing mount bolts. Clean the threads prior to torquing.
Those sound like excellent ideas...will do!
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Michael Fleming
Joseph, OR
sagriver at icloud dot com

RV-7 Slider #74572
Started 11/2016
Empennage completed 11/2016 (sans fiberglass)
Ailerons and flaps completed 3/2017.
Wings completed 12/2017 (sans fiberglass)
Started on QB fuselage 01/2018
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