As an aside to your query;
Before doing the fiberglass lay up for the retainer trim piece I drilled all the rivet holes around the boot cowl and then after the fiberglass was cured- before removing the cured retainer strip off the tape- I used a 12"x1/8" drill from the underside of the dash to drill through the fiberglass from underneath. I positioned a bright light over the outside of the boot-cowl so I could see the holes through the translucent fiberglass. This made reinstalling the retainer much more precise after it was trimmed for size. All is bedded in butyl tape for final install and side and top retainers are aluminum on my plane and held in place with screws.
The lower piece was my last bit and had I known easy it was to do and how nice it would turn out I would have used a one piece fiberglass retainer all the way around using the previously described method.
From: rshannon@cruzcom.com
Date: Sat, 13 Feb 2010 12:32:29 -0800
Subject: [rebel-builders] fiberglass retainer holes
To: rebel-builders@dcsol.com
Another query probably belonging in the Dept. of Dunce:
Am I correct in assuming the rivet holes in the fiberglass windshield
retainer should be over sized to accommodate differential thermal expansion,
as with most other composite (Lexan, acrylic, etc.) structures?
(BTW, Hanson Rivets has the large head/flange Avdel rivets some others have
used for this application.)
Ron
254R
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