Message-ID: <000b01c1d3da$54a64a80$8cc4bb3f@f3g6s4>
Reply-To: "Dan Schaefer" <dfs155@earthlink.net>
Reply-To: lancair.list@olsusa.com
From: "Dan Schaefer" <dfs155@earthlink.net>
To: "Lancair list" <lancair.list@olsusa.com>
Subject: Re: Isopropyl Alcohol?
Date: Mon, 25 Mar 2002 00:52:00 -0800
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Re: coupon test.

In short, two pieces of the test material are bonded, using the technique
you plan to use. The bond overlap should be typical of those used in
construction of your aircraft - perhaps a one square inch bond area with
each piece long enough to grab with very strong clamps -- maybe one or two
inches long each. The tag ends are then pulled (my ex-partner devised a rig
to do this with a hydraulic press) apart until either the bond or the parent
material fails.

I did this because, having no prior experience with bonding fiberglass, I
had no feel for the strength of the bond techniques I was going to bet my
butt on.

One must take precautions to contain any parts that may fly off the test rig
when the coupon fails. Our first one wasn't and part of the test rig was
launched across the shop to imbed itself in the dry-wall! We subsequently
enclosed the thing in a small wooden box --- of course, after that, nothing
ever flew off!

Hope this helps.

Dan Schaefer

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