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Fiberglass tape over the window edges

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Lenny Iszak

Joined: 23 Mar 2008
Posts: 270

Posted: Wed Jan 05, 2011 8:34 pm Post subject: Fiberglass tape over the window edges

Getting close to laying up a couple of layers of thin fiberglass on the edge of the windows so as to avoid cracking around the window perimeter.



I was wondering what have others done to prep the plexi before the fiberglass layup?



Apparently epoxy is not good enough to glue in the windows, so how is it going to hold the tape on there? Is there some kind of primer I could use to make the epoxy stick better?



Lenny

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Robin(at)PaintTheWeb.com
Guest

Posted: Wed Jan 05, 2011 8:56 pm Post subject: Fiberglass tape over the window edges

Lenny,

	One note. We routed out a shallow but wide amount of window &

fiberglass to allow for more fill without a noticeable bump. So far so

good with one exception. The lower outermost corners of the windshield are

beginning to show slight cracking (200+ hours). It sort of makes sense as

it is at the extremes of the largest window. I would pay extra close

attention to this area.



Robin



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dave.saylor.aircrafters(a
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Posted: Wed Jan 05, 2011 9:56 pm Post subject: Fiberglass tape over the window edges

Lenny,



Scuff the plex in the area to be covered with 80g.



Fill any groove between the window and the cabin top with your

favorite filler (mine is superfil).



Lay up one or two layers of the same cloth and epoxy used for the

windshield fairing--whatever you used there should be fine for the

overlay.  Use the same techniques for masking as you did at the base

of the windshield.  Plan to paint to a line about 1/16" inside the

overlay.



Without going to the trouble Robin did, you will end up with a small

hump.  His technique is probably lighter and more elegant, and more

time consuming.  A little filler will fair in the hump so it isn't

noticeable.  If you can find lighter cloth for the overlay, that will

reduce the hump (and filler/weight) as well.  I think I used some 2oz

cloth we had for another project.  It's like tissue paper but it does

the job.



Dave Saylor

AirCrafters

140 Aviation Way

Watsonville, CA 95076

831-722-9141 Shop

831-750-0284 Cell



On Wed, Jan 5, 2011 at 8:34 PM, Lenny Iszak <lenard(at)rapiddecision.com> wrote:

 	  Quote: 	
		   



 Getting close to laying up a couple of layers of thin fiberglass on the edge of the windows so as to avoid cracking around the window perimeter.



 I was wondering what have others done to prep the plexi before the fiberglass layup?



 Apparently epoxy is not good enough to glue in the windows, so how is it going to hold the tape on there? Is there some kind of primer I could use to make the epoxy stick better?



 Lenny





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=325758#325758

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indigoonlatigo(at)msn.com
Guest

Posted: Wed Jan 05, 2011 10:02 pm Post subject: Fiberglass tape over the window edges

I am coming up on 2400 hrs on my quick build fuselage and wing project. I am very near completion and I mean it. 

If I were to do the windows again, being the anal retentive type that I am, I would sand all the fiberglass channels that the window sit inside(joggle) and try to make them so there is no high points in the joggle. I would then make sure the window fit inside the perimeter of the joggle and I would do the Cleco and popsicle retainers verification of temporary holding the window and then I would actually build up the joggle with chopped glass and resin. This would make the joggle a consistent depth all the way around

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Mauledriver(at)nc.rr.com
Guest

Posted: Thu Jan 06, 2011 6:26 am Post subject: Fiberglass tape over the window edges

Flailing around blindly, I wound  up doing close to what John     describes....

     

     On 1/6/2011 12:58 AM, John Gonzalez wrote:      	  Quote: 	
		          snippety snip...

       

       

       Lastly, I would not use a fiberglass tape, it does not go         around corners at all. Instead, with a sharpie pen scribe a line         on the window where you want the fiberglass to overlap on the         window then purchased some transparent semi stiff, flexible,         thin acetate? plastic and make labelled patterns for each area         of each window by taping this plastic over the scribed areas and         sight through it to trace the contour onto this plastic. Cut out         these patterns and label their location.

       

       

       Next, buy another type of less stiff plastic (5mm drop cloth)         and use this on your table top, lay the fiberglass cloth down on         it and wet it out with resin and a squegee, one ply at a time,         one ply may be enough, no more than two needed, Now lay your         pattern over this wetted out glass with drop cloth beneath and         make a sandwich. Use a roller cutter to cut through the glass         and drop cloth along the contour of your pattern. Now lift up         this entire sandiwich and peel off the drop cloth plastic while         the wetted out glass remains attached to the acetate pattern so         you can carry it to the window location. Position it and peel         the acetate off leaving the glass in place over the window/gap         and onto the cabin top. 

       

       

       It actually is a little more work, but it works exceptionally         well. On mine I only used one ply of 9 oz satin weave glass. It         is a flexible tight weave glass and  follows contours well.

     	
     ....didn't realize that I did the same until I saw his pics.  It may     be less work.  I'm not sure how easily FG tape would work.  I'm not     sure that anyone  who refers to taping over the window edges     actually used FG tape (?).

      	  Quote: 	
		         

       

       Haven't been flying in so long I couldn't resist the other         non build photos.

     	
     Nice wintertime pics.  The "hang the camera out the vent" technique     gives you that great reflection off the canopy that makes many such     pics better than an unobstructed ones.

     

     Here's a photo from a friend Erik Mann showing the valley around     Pennsylvania's Mifflin Co. airport - where western racers come to     play chicken on 500' ridges.  Where has the flying season gone?

     

     Bill "dreaming of flying in fair skies" Watson

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dlm34077(at)q.com
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Posted: Thu Jan 06, 2011 6:49 am Post subject: Fiberglass tape over the window edges

Use E-glass cut on a 45 bias (instead of tape) so  that it turns the corners easily. Be sure and scuff the edges and clean them  with acetone before applying E-glass saturated epoxy resin. To make it easy then  cover with brown Teflon coated release ply available from Spruce for a fine mat  finish.

 [quote]   ---

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Lenny Iszak

Joined: 23 Mar 2008
Posts: 270

Posted: Thu Jan 06, 2011 4:25 pm Post subject: Re: Fiberglass tape over the window edges

Thanks everyone for the ideas. Looks like i'll just do two layers of thin FG cloth over the plexi. I was just a little concerned about the fiberglass/plexi bond, but i guess that's what everyone does.



Lenny.

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speckter(at)comcast.net
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Posted: Thu Jan 06, 2011 4:50 pm Post subject: Fiberglass tape over the window edges

With this method of securing the plexi, adhesion is not as important as you

have a channel for the glass to lay in and it is supported both on the

inside and outside.



Gary Specketer



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rv10builder(at)verizon.ne
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Posted: Thu Jan 06, 2011 5:32 pm Post subject: Fiberglass tape over the window edges

wait until you get to the front windscreen and build the fairing, there are 

10 layers of cloth over the plexi at that point.

You'll be fine!

Pascal



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