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10-15-2019, 08:01 PM
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Join Date: Feb 2013
Location: Kincardine Ont,Can
Posts: 169
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Final Assembly
Because it?s been suggested that your Nas bolts be frozen , I had a buddy make me up a brass driver to put in my three X rivet gun , take your prelubed bolts and drive them home while they are still frozen, a few thousandths of an inch shrink makes a big difference in this scenario ,
Good luck jacking your center section apart !!
__________________
RV 6. GARV
1946 C85 J3
RV 7 A project
Grounds keeper @ CKS9, 2020 dues gladly pd
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10-17-2019, 03:38 PM
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Join Date: Sep 2016
Location: Joseph, Oregon
Posts: 561
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Quote:
Originally Posted by wirejock
Glad you got a fix. That 3/8" All Thread is bloody brilliant.
Keep us posted.
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So here's my attempt at a center section spreader.
I tried ⅜" all thread but felt like I couldn't protect the burnished holes as well as I liked. Any plastic tubing I put on the threads was to large for the 7/16" holes and putting tape on the threads was a pain.
So I'm using ?" all thread. this allows me to have plastic tubing on the threads and as I snug up the nuts, the nuts push the tubing deaper in the hole...protecting the hole at all times.
I'm hoping this will be more controlled than an axe handle
Click refresh if all the images don't load...

__________________
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
Started on QB fuselage 01/2018
Donated for 2020 and so should you
Last edited by mfleming : 10-17-2019 at 03:41 PM.
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10-17-2019, 10:23 PM
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Join Date: Sep 2016
Location: Joseph, Oregon
Posts: 561
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Quote:
Originally Posted by mfleming
So here's my attempt at a center section spreader.
I tried ⅜" all thread but felt like I couldn't protect the burnished holes as well as I liked. Any plastic tubing I put on the threads was to large for the 7/16" holes and putting tape on the threads was a pain.
So I'm using ?" all thread. this allows me to have plastic tubing on the threads and as I snug up the nuts, the nuts push the tubing deaper in the hole...protecting the hole at all times.
I'm hoping this will be more controlled than an axe handle
Click refresh if all the images don't load...

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Well I did a test to see if this affair would help with the narrow center section problem and it was a success.
I took a series of measurements with an inside gauge before and after putting some pressure on the center section and I easily gained .050". This was at the top of the center section and will give me the clearance needed to fit the wing spar.
I have not attempted to put pressure on the lower center section and will only do so if this method does not work.
__________________
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
Started on QB fuselage 01/2018
Donated for 2020 and so should you
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10-17-2019, 11:08 PM
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Join Date: Feb 2005
Location: LSGY
Posts: 3,202
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spreader idea
As wirejock said, brilliant idea. Hope it works, these are scary times I'm sure, but hang in there.

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10-18-2019, 04:57 AM
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Join Date: Sep 2007
Location: Central IL
Posts: 5,516
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Looking good!!
That looks good Michael - making measurements indicates you are being careful. My bolts were a bit different in size but this will do the job, and you can remove them when the wing spar is partially inserted.
I sized my holes, measured them and selected the NAS bolts for specific bores based on the sizes. A large table of measurements extremes. I numbered all the bolts on the heads for the selected locations Right/L, Upper/L, Inner/O
My plans did not show it, but due to available threads, all the large bolts need washers under the heads, unless there is an .063 metal bracket there. This is important. You will need this information for the fitting if you use the NAS bolts.
__________________
Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
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10-18-2019, 05:09 AM
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Join Date: Sep 2007
Location: Central IL
Posts: 5,516
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Size (swage) the holes an the NAS require much less pounding.
Quote:
Originally Posted by elev666
Because it’s been suggested that your Nas bolts be frozen , I had a buddy make me up a brass driver to put in my three X rivet gun , take your prelubed bolts and drive them home while they are still frozen, a few thousandths of an inch shrink makes a big difference in this scenario ,
Good luck jacking your center section apart !!
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I measured all the holes and confirmed the fit was caused by minute misalignment of the various layers of the thinner webs. So - rather than accept a onetime installation of the NAS, or reaming (eek) swaging was selected. I made some tapered steel plugs and measured specifically for each bore, then pushed ( drove) them through. The taper was about .0003 per inch. Some holes required progressive sizes , but with matching of the measured NAS bolts, they all fit snugly, never larger than the heavy web diameter, and were removable. Generous lubrication always. The same pins were used to get perfect alignment on assembly. Pushed through with the NAS bolts. Rounded on the ends to prevent expansion damage or thread damage. They were shorter than the wingspan thickness so they could be removed after each hole.
Measure of success: I had to remove 4 NAS bolts to install washers, and although snug, a small hammer and force was able to remove and reinstall the bolts. No IPA/dry ice slurry bath, although I did have some on hand.
__________________
Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
Last edited by BillL : 10-18-2019 at 05:13 AM.
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10-18-2019, 04:27 PM
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Join Date: Sep 2016
Location: Joseph, Oregon
Posts: 561
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Quote:
Originally Posted by jcarne
I personally don't really see the point in fitting the wings and then just taking them off. Seems like a bit of wasted time. I just plan on doing the fitting towards the end of the build and call it good. Many a builders have followed this plan as well.
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Normally I would agree with you. For my build, I plan on painting before final assembly. I'm hoping to have all the fit and finish work completed before paint.
__________________
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
Started on QB fuselage 01/2018
Donated for 2020 and so should you
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10-18-2019, 04:42 PM
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Join Date: Jul 2016
Location: Worland, Wyoming
Posts: 1,365
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Quote:
Originally Posted by mfleming
Normally I would agree with you. For my build, I plan on painting before final assembly. I'm hoping to have all the fit and finish work completed before paint.
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Well in that case I agree with you that fitting the wings now is of great benefit. Glad to see you gained the space you needed!
__________________
Jereme Carne
PPL
RV-7A Emp. done
Wings done
Fuselage done
Finish kit almost done
Exempt but gladly paying!
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11-14-2019, 08:22 PM
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Join Date: Sep 2016
Location: Joseph, Oregon
Posts: 561
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Wing Fitting Success
The wings are hung and the rear spars drilled.
My little spreader device worked like a champ. the main wing spars slid in with no trouble. the spreader was removed after the main spar was inserted into the center section and the spar was slid in the rest of the way.
The sweep and incidence were set but I could not get better than a ?" forward sweep. The left rear spar was hitting a fuselage rivet, stopping the wing from coming further back. I slid the wing out of the center section enough to relive the rear spar were it was hitting the rivet. This brought the forward sweep to 3/16" and allowed for a more generous edge distance. Although the right wing had only a 3/32" margin for edge distance....kinda scary.
If the photos don't show, just do a refresh until they show up.
Here's the left main spar just after removing the spreader.
Here's all four drift pins inserted into the left main center section.
Checking the plumb bobs.
Here's the left rear spar with the section relieved due to the rivet.
Checking wing incidence angle.
The rear spar drilled and the bolt installed

__________________
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
Started on QB fuselage 01/2018
Donated for 2020 and so should you
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11-14-2019, 10:27 PM
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Join Date: Feb 2005
Location: LSGY
Posts: 3,202
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Congrats!
Congrats Mike! Glad it worked out ok. Don't forget the tank bracket. Now's the right time for that if you have not already done it.
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