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Glassing Window Transition

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kearney

Joined: 20 Sep 2008
Posts: 563

Posted: Sat Aug 11, 2012 2:48 pm Post subject: Glassing Window Transition

Hi   

Somewhere recently I read about using fibreglass tape (RC model) to glass over the gap between the canopy and windows. I did a bit of shopping today and was only able to find tape that was of  6 oz weight. For this application I was thinking that a very light cloth would be appropriate.  

Can one of the f/g experts shine some light on what weight of glass I should use.   ACS has 1.45 oz "deck" cloth. Would this be appropriate? How may layers should I use…..  

Inquiring minds need to know…   

Les  

#40643      [quote][b]

Dick Sipp

Joined: 11 Jan 2006
Posts: 215
Location: Hope, MI

Posted: Sat Aug 11, 2012 3:38 pm Post subject: Glassing Window Transition

Les, et. al.

  

 I commented on the recent post that I had used  one layer of the light weight RC fiberglass tape around the windows.  I  have some minor cracking now with 430 hours.

 I donâ€™t think the light tape has much strength  and if it touched at all in the sanding filling process it is probably further  weakened.  The problem with using heavier or more layers of fiberglass is  the build up that would be difficult to contour down to the level of the window  and then back into the natural curve of the top.  I spent a lot of time on  this area; it is tricky to get it to look right if one starts building up the  area of the seam.

  

 $.02 worth.

  

 Dick Sipp

 N110DV 430 hours

  

  

  

 

 

   [quote][b]

Strasnuts

Joined: 10 Feb 2009
Posts: 502
Location: Salt Lake City, UT

Posted: Sat Aug 11, 2012 3:55 pm Post subject: Glassing Window Transition

I put two layers of thick glass around mine after  others had cracking around the windows from using rc glass.  It took me a  long time to contour mine and ready it for paint.  The paint shop I took it  to sanded down most of my work and the windows started to show the seams after  50 hours.  I took mine back to the paint shop and made them take off the  paint and build back up the seams around the windows.  They re-sprayed it  and now I think it will remain uncracked.

  

  

 [quote]   ---

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40936
RV-10 SB N801VR Flying
780 Hours
SuperSTOL 60 hours

rleffler

Joined: 05 Nov 2006
Posts: 680

Posted: Sun Aug 12, 2012 3:33 am Post subject: Glassing Window Transition

I did the same as Sean.   Dan Horton has a good write up on VAF on how to contour the transition with several layers of tape.   That process works well.  The one recommendation I would have would be to use different colors of tape so that you can better see when you sand through the top layer.



Sent from my iPad



On Aug 11, 2012, at 7:54 PM, "Seano" <sean(at)braunandco.com (sean(at)braunandco.com)> wrote:



[quote] Glassing Window Transition      I put two layers of thick glass around mine after  others had cracking around the windows from using rc glass.  It took me a  long time to contour mine and ready it for paint.  The paint shop I took it  to sanded down most of my work and the windows started to show the seams after  50 hours.  I took mine back to the paint shop and made them take off the  paint and build back up the seams around the windows.  They re-sprayed it  and now I think it will remain uncracked.

  

  

 [quote]   ---

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N410BL - Phase I
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AirMike

Joined: 27 Feb 2007
Posts: 514
Location: Nevada

Posted: Sun Aug 12, 2012 8:24 am Post subject: Glassing Window Transition

I used a lot of microbaloons in my epoxy/tape mix. Holding up well after (150hrs) 3 years.

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Ron B.

Joined: 17 Feb 2009
Posts: 103
Location: Nova Scotia

Posted: Sun Aug 12, 2012 10:48 am Post subject: Re: Glassing Window Transition

Exact same experience as Dick Sipp only with less hrs. I would use heavier cloth and make sure I did not sand it off.

tsts4

Joined: 06 Aug 2007
Posts: 167
Location: Tampa, FL

Posted: Mon Aug 13, 2012 6:40 am Post subject: Re: Glassing Window Transition

Anyone have pics or video of the glassing process?  What I'm trying to figure out is the mechanics of the glass strips. Is each layer cut in one piece to conform to the window's shape or multiple strips that are butted together until the entire gap is covered?

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Todd Stovall
aka "Auburntsts" on EAA and VAF
RV-10 N728TT -- Flying

Strasnuts

Joined: 10 Feb 2009
Posts: 502
Location: Salt Lake City, UT

Posted: Mon Aug 13, 2012 6:59 am Post subject: Glassing Window Transition

Probably a better way than how I did it but I overlapped so there were two 

layers and the seams were offset.

---

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RV-10 SB N801VR Flying
780 Hours
SuperSTOL 60 hours

Lew Gallagher

Joined: 04 Jan 2008
Posts: 402
Location: Greenville , SC

Posted: Mon Aug 13, 2012 7:09 am Post subject: Glassing Window Transition

Hey Todd, et al,



I think I've still got pictures, but not on this computer.  This discussion 

has been posted in the past, here goes again.  What I've done is to use a 

right angle air die grinder with a 2" sanding pad to grind out a slight 

shallow in the plexi and fiberglass overlapping the joint (after the plexi 

is glued in).   Maybe 3/4" wide, 1/16" deep.  Think edge of sheetrock that 

is tapered so that you can mud in tape and be flush when sanded.  I glass in 

cloth (don't know what thickness, just whatever I've used for everything 

else from West Systems!) in this shallow, butting around corners, at full 

strength,  then finish it out with micro balloon slurry, sand flush (doesn't 

get into cloth) ... done.  Three years flying and no cracks.



Later, - Lew

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Kellym

Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ

Posted: Mon Aug 13, 2012 7:24 am Post subject: Glassing Window Transition

Has anyone gone with the formed aluminum retainer strip like many 

certified aircraft have? I recall seeing it on a website but can't find 

it now.



On 8/13/2012 8:10 AM, lewgall(at)charter.net wrote:

 	  Quote: 	
		   



 Hey Todd, et al,



 I think I've still got pictures, but not on this computer.  This 

 discussion has been posted in the past, here goes again.  What I've 

 done is to use a right angle air die grinder with a 2" sanding pad to 

 grind out a slight shallow in the plexi and fiberglass overlapping the 

 joint (after the plexi is glued in). Maybe 3/4" wide, 1/16" deep.  

 Think edge of sheetrock that is tapered so that you can mud in tape 

 and be flush when sanded.  I glass in cloth (don't know what 

 thickness, just whatever I've used for everything else from West 

 Systems!) in this shallow, butting around corners, at full strength,  

 then finish it out with micro balloon slurry, sand flush (doesn't get 

 into cloth) ... done. Three years flying and no cracks.



 Later, - Lew


	


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Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD

kearney

Joined: 20 Sep 2008
Posts: 563

Posted: Mon Aug 13, 2012 8:03 am Post subject: Glassing Window Transition

Hi Kelley



Here is the link. http://www.mlblueskunk.com/News.html



It says only 3 have been done so far. 



Cheers



Les



Sent from my iPhone



On 2012-08-13, at 9:23 AM, Kelly McMullen <kellym(at)aviating.com> wrote:



 	  Quote: 	
		   

 

 Has anyone gone with the formed aluminum retainer strip like many certified aircraft have? I recall seeing it on a website but can't find it now.

 

 On 8/13/2012 8:10 AM, lewgall(at)charter.net wrote:

> 

> 

> Hey Todd, et al,

> 

> I think I've still got pictures, but not on this computer.  This discussion has been posted in the past, here goes again.  What I've done is to use a right angle air die grinder with a 2" sanding pad to grind out a slight shallow in the plexi and fiberglass overlapping the joint (after the plexi is glued in). Maybe 3/4" wide, 1/16" deep.  Think edge of sheetrock that is tapered so that you can mud in tape and be flush when sanded.  I glass in cloth (don't know what thickness, just whatever I've used for everything else from West Systems!) in this shallow, butting around corners, at full strength,  then finish it out with micro balloon slurry, sand flush (doesn't get into cloth) ... done. Three years flying and no cracks.

> 

> Later, - Lew

> 

> 

> 

> 

> 

> 

> 

> 

 

 

 

 -----

 No virus found in this message.

 Checked by AVG - www.avg.com

tsts4

Joined: 06 Aug 2007
Posts: 167
Location: Tampa, FL

Posted: Mon Aug 13, 2012 8:03 am Post subject: Re: Glassing Window Transition

I've attached a crude graphic to illustrate for visual learners like me what I 'm trying to figure out.  The window shape is the black rectangle, the colored lines rep individual tapes butted together at the corners and the gray is a single ring of tape cut to the window's shape in lieu of using individual pieces.



Seems like based on the answers so far (and my own very limited fiberglass experience) that the individual tapes are the way to go, but I'm open to suggestions.

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Todd Stovall
aka "Auburntsts" on EAA and VAF
RV-10 N728TT -- Flying

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