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  #1  
Old 10-09-2019, 02:07 PM
mfleming's Avatar
mfleming mfleming is offline
 
Join Date: Sep 2016
Location: Joseph, Oregon
Posts: 418
Cool Fit the Wings Now or Not

OK, Here it is September 2019 already

Back in June of 2018 I posted this thread about my center section being narrower than my wing spars.
Here are the numbers from my original post just for reference:

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"


The how to's and what for's were figured out in that old thread. Now I'm at the point where the RV-7 Manual and common sense say's time to fit your wings.

I have a question about the wisdom of fitting the wings now.

Given all the discussion in the previous post about the tight clearances I will encounter, am I asking for trouble to fit the wings and then remove them for final install later?

One side of me says do it now and if I run into serious problems at least I'm early enough in the build process to make major corrections if needed.
On the other hand I'm thinking do the wing fit/install at final assembly and if the install is a bear at least its done and I won't have to remove them.

Looking for the collective wisdom of those that have gone down this road before.
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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
Donated for 2019 and so should you
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  #2  
Old 10-09-2019, 02:39 PM
sahrens's Avatar
sahrens sahrens is offline
 
Join Date: Jan 2007
Location: Battle Ground
Posts: 469
Default

I tried to finish as much of the panel wiring as I could before putting the wings on the last time. It is much easier to walk around and stand next to the forward part of the fuselage without the wings in the way.

Same argument for fitting the canopy. So, I guess it depends how much of that you have completed.
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  #3  
Old 10-09-2019, 03:17 PM
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rmartingt rmartingt is offline
 
Join Date: Nov 2006
Location: Savannah, GA
Posts: 948
Default

I fit mine to do control and fuel installation, then removed them. I want todo as much work as possible at home before going to the airport because the nearest realistic option is 45 minutes away.

All it takes to reinstall them now is a day of cleaning up the shop, plus some beers to bribe friends. I can do it again if needed.

Of you have the room, go ahead and do it. They can come back off.
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  #4  
Old 10-09-2019, 04:07 PM
wirejock's Avatar
wirejock wirejock is offline
 
Join Date: Oct 2005
Location: Estes Park, CO
Posts: 3,534
Default Fit the wings

Quote:
Originally Posted by rmartingt View Post
I fit mine to do control and fuel installation, then removed them. I want todo as much work as possible at home before going to the airport because the nearest realistic option is 45 minutes away.

All it takes to reinstall them now is a day of cleaning up the shop, plus some beers to bribe friends. I can do it again if needed.

Of you have the room, go ahead and do it. They can come back off.
I agree. Had mine on and off several times and made sure to complete all the little jobs.
Forward tank brackets
Fuel line connections
Vent line connections
Fuse/wing fairing
Plumbing connections
You would be suprised how long they take to get perfect.
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Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 12/03/2019, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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  #5  
Old 10-09-2019, 04:09 PM
mfleming's Avatar
mfleming mfleming is offline
 
Join Date: Sep 2016
Location: Joseph, Oregon
Posts: 418
Default

Quote:
Originally Posted by wirejock View Post
I agree. Had mine on and off several times and made sure to complete all the little jobs.
Forward tank brackets
Fuel line connections
Vent line connections
Fuse/wing fairing
Plumbing connections
You would be suprised how long they take to get perfect.
Even with the prospect of a tight fit??
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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
Donated for 2019 and so should you
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  #6  
Old 10-09-2019, 05:13 PM
wirejock's Avatar
wirejock wirejock is offline
 
Join Date: Oct 2005
Location: Estes Park, CO
Posts: 3,534
Default Tight center section

Quote:
Originally Posted by mfleming View Post
Even with the prospect of a tight fit??
I remember your post. It sounds like you resolved it. I still would want to know before the final install.
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Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 12/03/2019, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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  #7  
Old 10-09-2019, 06:58 PM
Bavafa Bavafa is offline
 
Join Date: Oct 2007
Location: Sacramento, CA
Posts: 3,095
Default

Quote:
Originally Posted by mfleming View Post
Even with the prospect of a tight fit??
I am not sure what "tight fit" means? Is that referring to the space you have or the wings are tight fit?
As others have mentioned, there is plenty of work to be done, once the wings are attached. You can use sacrificial (hardware store) bolts grinded a bit for an easier installation of the wings.
- The bottom skin overlap needs to be match drilled
- the rear spar can be match drilled
- All fuel line plumbing can be done and tested
- Aileron push/pull can be fitted
- All other task identified by others can be completed
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  #8  
Old 10-09-2019, 08:27 PM
mfleming's Avatar
mfleming mfleming is offline
 
Join Date: Sep 2016
Location: Joseph, Oregon
Posts: 418
Default

Quote:
Originally Posted by Bavafa View Post
I am not sure what "tight fit" means? Is that referring to the space you have or the wings are tight fit?
As others have mentioned, there is plenty of work to be done, once the wings are attached. You can use sacrificial (hardware store) bolts grinded a bit for an easier installation of the wings.
- The bottom skin overlap needs to be match drilled
- the rear spar can be match drilled
- All fuel line plumbing can be done and tested
- Aileron push/pull can be fitted
- All other task identified by others can be completed
By tight fit I mean that the center section is narrower than the spars and will require extra ordinary work to get the spars to slide into the center section.

Thats the numbers listed in the first post and, if interested, detailed in the link to an older post about the tight fit.

I realize that there is plenty to do by fitting the wings now. My concern is if I get the wings fitted and it's a huge struggle...I might be bummed to have to remove them as opposed to fitting them one time in the hangar during final assembly.

I am hoping someone who has had the same tight fit issues (Van's say's it's common) will jump in and say "no worries" OR "save the fitting till the end so you don't have to pull them again.
__________________
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
Donated for 2019 and so should you
Reply With Quote
  #9  
Old 10-10-2019, 12:59 AM
Bavafa Bavafa is offline
 
Join Date: Oct 2007
Location: Sacramento, CA
Posts: 3,095
Default

Quote:
Originally Posted by mfleming View Post
By tight fit I mean that the center section is narrower than the spars and will require extra ordinary work to get the spars to slide into the center section.

Thats the numbers listed in the first post and, if interested, detailed in the link to an older post about the tight fit.

I realize that there is plenty to do by fitting the wings now. My concern is if I get the wings fitted and it's a huge struggle...I might be bummed to have to remove them as opposed to fitting them one time in the hangar during final assembly.

I am hoping someone who has had the same tight fit issues (Van's say's it's common) will jump in and say "no worries" OR "save the fitting till the end so you don't have to pull them again.
Fitting the wings into place was not much of a struggle for me at all, took very little time with a help of friend. The real struggle is to put the close tolerance bolts in, specially in a 7A with the gear tower. Another struggle in a 7A is to build the gear leg fairing but you won't have to do that and I believe now days one can just buy those instead of building them.
When times come for the close tolerance bolts, try freezing them or better yet put them in dry ice and 90% alcohol to contract them slightly.

With best wishes, you are getting close and it is exciting times.
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N825SM RV7A - IO360M1B - SOLD
N825MS RV14A - IO390 - Flying
Dues paid
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  #10  
Old 10-10-2019, 02:51 AM
rv8ch's Avatar
rv8ch rv8ch is offline
 
Join Date: Feb 2005
Location: LSGG
Posts: 2,733
Default building in a hangar?

Did Van's say that removing the wings if there is a "tight fit" will be hard? Mine was a "normal" fit, so it was easy to get the wings off. Final assembly in the hangar was just a few hours work.

How comfortable is your hangar? There are several days of work after the wings are fit for the first time, and several steps are really important to get right, like setting the wing incidence. I'd suggest doing this in a comfortable place so you are not tempted to rush. I'd guess after the initial tight fit, subsequent installations will be easier.
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