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11-14-2013, 08:05 PM
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Join Date: Jan 2005
Location: Round Rock, TX
Posts: 3,778
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Quote:
Originally Posted by propsync
Any comments on a gasket? That's why I revived the thread.
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I used very thin one side stick insulation foam from Home Depot. I thick it was 1/16" thick and 3/8" wide. I put it on the inside on the aluminum... worked very well. 
__________________
Reiley
Retired N622DR - Serial #V7A1467
VAF# 671
Repeat Offender / Race 007
Friend of the RV-1
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11-14-2013, 08:34 PM
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Join Date: Apr 2012
Location: Tampa, FL
Posts: 310
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Good tip, thanks
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Tom B
Tampa, FL
EAA - Tampa Exec Airport
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11-14-2013, 09:23 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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Be careful when using a gasket. If you get a nice tight fit without, then add it, the lens can be a lot more prone towards cracking.
If you do use something, make sure it has very low compression resistance.
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Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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11-15-2013, 06:54 AM
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Join Date: Jan 2005
Location: Round Rock, TX
Posts: 3,778
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also as with any plastic lens... light tight, do not crank down the screws and lock them down, you will crack the lens gasket or no gasket. 
__________________
Reiley
Retired N622DR - Serial #V7A1467
VAF# 671
Repeat Offender / Race 007
Friend of the RV-1
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12-27-2017, 12:09 PM
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Join Date: Apr 2015
Location: Ponte Vedra, FL
Posts: 1,474
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Reviving an old thread.
I just did the lens on the first of my QB wings - followed instructions to the letter. When I match drilled the lens to wing, I pulled it up very tight to leading edge, but after all the subsequent steps, when I screw lens in there's a 1/16 or so gap at the leading edge - a bit more inboard.
I don't see how this could get better with another part as I have already drilled the wing holes to #27 and dimpled them. I may try deepening the lens material countersinks a bit - but the main question is what would be a good way to seal the edges where there is a gap?
I'm assuming that there's more experience with this now.
Thanks!
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12-29-2017, 05:40 AM
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Join Date: Dec 2011
Location: Alpharetta, Ga
Posts: 212
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Me Too!
Quote:
Originally Posted by mturnerb
Reviving an old thread.
I just did the lens on the first of my QB wings - followed instructions to the letter. When I match drilled the lens to wing, I pulled it up very tight to leading edge, but after all the subsequent steps, when I screw lens in there's a 1/16 or so gap at the leading edge - a bit more inboard.
I don't see how this could get better with another part as I have already drilled the wing holes to #27 and dimpled them. I may try deepening the lens material countersinks a bit - but the main question is what would be a good way to seal the edges where there is a gap?
I'm assuming that there's more experience with this now.
Thanks!
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I also ended up with a small gap on on the leading edge lens to skin fit. Like you, I had the lens pulled/pushed as tight as possible when match drilling the skin holes to the lens. At that time the lens fit very tight with no gap. However; after final drilling, countersinking, attaching mounting brackets, and installing, I ended up with the gap. Mine is mostly on the leading edge lower side. Both left and right wings ended up about the same. If I had to do it over again, and I might  , I would ensure (thought it was this time) the drill bit is perpendicular to the skin when match drilling (or even angle the bit slightly aft on the lens). Not sure, but if I decide to leave as is, maybe a very small bead of black RTV after paint and final installation might not look too bad.
This is not final installation, and things still need dressed up bit. Also,I used the longer screws for the nutplates as initially called for in the plans. The screw call out has since been changed to shorter lengths so very little threads will be visible.
Still trying to figure out how to post pics, but here goes.
https://photos.app.goo.gl/Kig4IVBJxgwLAFfg2
https://photos.app.goo.gl/KhhSpZNDw30KujIK2
https://photos.app.goo.gl/gLAYN5wjuMAwkY5I3
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12-29-2017, 06:25 AM
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Join Date: Apr 2015
Location: Ponte Vedra, FL
Posts: 1,474
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Quote:
Originally Posted by Mudfly
I also ended up with a small gap on on the leading edge lens to skin fit. Like you, I had the lens pulled/pushed as tight as possible when match drilling the skin holes to the lens. At that time the lens fit very tight with no gap. However; after final drilling, countersinking, attaching mounting brackets, and installing, I ended up with the gap. Mine is mostly on the leading edge lower side. Both left and right wings ended up about the same. If I had to do it over again, and I might  , I would ensure (thought it was this time) the drill bit is perpendicular to the skin when match drilling (or even angle the bit slightly aft on the lens). Not sure, but if I decide to leave as is, maybe a very small bead of black RTV after paint and final installation might not look too bad.
This is not final installation, and things still need dressed up bit. Also,I used the longer screws for the nutplates as initially called for in the plans. The screw call out has since been changed to shorter lengths so very little threads will be visible.
Still trying to figure out how to post pics, but here goes.
https://photos.app.goo.gl/Kig4IVBJxgwLAFfg2
https://photos.app.goo.gl/KhhSpZNDw30KujIK2
https://photos.app.goo.gl/gLAYN5wjuMAwkY5I3
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Pretty much what I was thinking - or some foam tape around the edges so it won't be so hard to remove lens to service lights down the road. I was pretty careful to stay perpendicular when drilling - I had an assistant so plenty of hands. I think it's just the tolerances, ability of screw/dimple/countersink alignment to slip a bit and the inherent shape of the lens "stacking up". I talked to Vic Syracuse about it as well and he suggested some kind of seal around the edge - mentioned Duck Works kits having a seal for this sort of issue. I probably won't think about it much until final install.
Another question - what did you use to adhere backing plates to lens? I initially tried double-sided tape but it has some thickness that allows the nutplates to "sag" against lens when screws are snugged up. What's safe to use on plexi?
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12-29-2017, 06:46 AM
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Join Date: Jan 2012
Location: Northeast Ohio
Posts: 685
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Quote:
Originally Posted by mturnerb
Another question - what did you use to adhere backing plates to lens? I initially tried double-sided tape but it has some thickness that allows the nutplates to "sag" against lens when screws are snugged up. What's safe to use on plexi?
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Turner-
You really don't need anything to secure the backing strips to the lens. I used waxed cord to temporarily hold the strips in place while a couple of screws could be installed. Below is a link with photos showing how I installed the lens/backing strips in the wing of a RV-12.
http://www.dogaviation.com/2016/08/l...tion-woes.html
Happy building,
__________________
John
www.dogaviation.com
RV-12 Wings, Empennage, Fuselage, Finishing, Avionics and Powerplant kits all completed
Now Flying!!
Donation paid until September 2021
Last edited by John-G : 12-29-2017 at 07:04 AM.
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12-29-2017, 06:59 AM
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Join Date: Dec 2013
Location: NOLA
Posts: 229
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Quote:
Originally Posted by John-G
Turner-
You really don't need anything to secure the backing strips to the lens. I used waxed cord to temporarily hold the strips in place while a couple of screws could be installed. Below is a link with photos on how I installed mine.
http://www.dogaviation.com/2016/08/l...tion-woes.html
Happy building,
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The string idea is pretty slick. I had the same issue with the double sided tape, so I just ended up holding it in place with my fingers until I got two screws started.
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Ryan
RV-14 In-Progress
Build Site
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12-29-2017, 11:05 AM
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Join Date: Apr 2015
Location: Ponte Vedra, FL
Posts: 1,474
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Quote:
Originally Posted by John-G
Turner-
You really don't need anything to secure the backing strips to the lens. I used waxed cord to temporarily hold the strips in place while a couple of screws could be installed. Below is a link with photos showing how I installed the lens/backing strips in the wing of a RV-12.
http://www.dogaviation.com/2016/08/l...tion-woes.html
Happy building,
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Thanks for this! Great idea!
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