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  #1  
Old 12-04-2017, 12:16 PM
goatflieg's Avatar
goatflieg goatflieg is offline
 
Join Date: Jul 2013
Location: Clarkston, MI
Posts: 385
Default Tip: Bending Windscreen Support Weldment

Most builders have had fit issues with weldments at some point. I had a fairly major one with my WD-814 windscreen support/roll bar. When I test fit it initially, it had the usual problems; the forward part of the triangular gussets were raised up a bit, and it didn't fit very well between the vertical tabs and the fuselage cockpit rails. If I snugged up one side, it left me with a 5/16" gap between the tab and the rail on the other side. That's quite a gap:

I checked for possible solutions here, but didn't find much info on the side-to-side issue, so I called Van's builder support. They said it was a common problem and that I should definitely spread the hoop slightly so that the tabs will fit the fuselage. We discussed various ways to do this. I had tried the "armstrong" method of holding one end down on a padded surface with my foot and pulling upward... but I knew right away my back wouldn't care much for that. So I did some thinking... and came up with this solution. I used my cherry picker; securing a chain around the base, wrapping tie-down straps around either side of the hoop and securing them to the base chain and lifting hook, and carefully extending the boom to stretch the hoop:

I would stretch it a bit, let it spring back, and check measurements:

Eventually, after a couple bending sessions and a couple test-fits, I got it to fit just right:

I was so happy with the result, I wanted to share it right away. Van's said that the triangulated braces would probably pull together with the canopy rails with the bolts tightened; if I do any tweaking to those, I'll also share it here.
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Martin J Filiatrault
Clarkston, MI
RV-8 #83507 - empennage complete (except fiberglass)
QB wings & fuselage work continues
N657AR reserved
Builder websites:
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Dues paid for 2018... extra payment included for psychological therapeutic services rendered.

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  #2  
Old 12-04-2017, 06:48 PM
greghughespdx greghughespdx is offline
 
Join Date: Nov 2011
Location: Aurora, OR
Posts: 442
Default

Yep, I did something similar and found that the bolts snugged everything up to the rails quite well once tightened down properly.
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  #3  
Old 12-04-2017, 07:05 PM
Stoo Stoo is offline
 
Join Date: May 2006
Location: LL10, Naperville, IL.
Posts: 49
Default

Good tip, Martin! The roll bar on my 6 slider needed to be tweaked the other way. Used my floor mount drill press as a big arbor press to make it fit!
Stewart Willoughby, 6 panel/wiring
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  #4  
Old 12-04-2017, 07:06 PM
Neal Trombley Neal Trombley is offline
 
Join Date: Aug 2016
Location: North Fort Myers
Posts: 240
Default

pure genius
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SW Florida
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July 2017
Dec 2017
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  #5  
Old 02-14-2018, 09:18 PM
WingRock WingRock is offline
 
Join Date: Aug 2015
Location: Davenport, IA
Posts: 5
Default New Guy Trying to Stretch WD-814

Martin, I have exactly the same gap between the rails and the WD-814. I also spoke with Vans Support and they told me the exact same thing. I attempted to use a hydraulic jack to stretch it and even with an inch and a half of movement it sprung back to it's original size. I got hesitant to push beyond that. Do you have any idea how far you had to go to actually have it retain some of the stretch?
[IMG][/IMG]
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Davenport, IA
RV8 Tail and QB Wings done, deep into QB Fuse
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  #6  
Old 02-14-2018, 09:33 PM
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fl-mike fl-mike is offline
 
Join Date: Jul 2005
Posts: 933
Default

Boy, I wouldn’t do that operation anywhere near that nice undented skin...
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Venice, FL
RV-6A. Mattituck TMX O-360, FP, GRT Sport EFIS
N164WM
N184WM reserved (RV-8)....tail kit done, slow-build wing done, slow-build fuselage started.
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  #7  
Old 02-14-2018, 10:15 PM
Larco Larco is offline
 
Join Date: Mar 2005
Location: DVT Phoenix
Posts: 1,027
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YUP, That top block is just screaming to dislodge under extreme pressure and turn your life into pure H***.
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  #8  
Old 02-15-2018, 06:23 AM
Allan Stern Allan Stern is offline
 
Join Date: Jan 2006
Location: Cape Coral, Florida
Posts: 188
Default Yep

But that is the joy of learning what not to do during your build. 😫
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  #9  
Old 02-15-2018, 02:59 PM
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Scott Chastain Scott Chastain is offline
 
Join Date: Jan 2005
Location: KMCE
Posts: 683
Default Back Yard Method

This works, too, if you don't mind putting local vegetation to the test with ratchet straps:

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RV-8 N898W Descending Dove
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  #10  
Old 02-15-2018, 03:18 PM
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BuckWynd BuckWynd is offline
 
Join Date: Nov 2006
Location: Rockford, IL
Posts: 488
Default

I used a set of heavy-duty ratchet straps to widen the support. They allowed me to spread the bar to about 26-1/4", which resulted in the desired final width of 24-3/8".

Don't pull on anything important, like the support beams in your hangar.
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