Aside from the exhausts, the hottest external part of a 912 is the
cylinders (walls, not head), which are allowed a maximum temp of 190C.
There are a number of high temp epoxies available. Cheap and widely
obtainable is the Borden Chemical range, which has a Tg of 150C
(following post cure).
I suspect that the epoxy in the Rotax hood is loaded with fire retardant
(probably Antimony Trioxide), hence its opaque white colour. I've not
otherwise found a high temp resin that is fire retardant, or a fire
retardant epoxy (there are lots in use for marine applications, to keep
the insurance companies happy) that has other than a low Tg. Still
doesn't explain the extraordinary high cost of the Rotax cylinder hood.
Duncan McF.
> Date: Sat, 8 Mar 2008 20:05:11 -0600
> From: paul.the.aviator@gmail.com
> To: europa-list@matronics.com
> Subject: Europa-List: High temperature fiberglass
>
<paul.the.aviator@gmail.com>
>
> Hi all,
>
> I was looking at a Rotax installation in a Diamond Kintana the other
> day and I noticed that they have manufactured a fiberglass plenum air
> duct to drive the airflow over the cylinder heads and downwards.
>
> Anyhow, I am curious about what type of fiberglass cloth and resin
> system they use that could withstand the temperatures under the
> cowling. Does anyone have any idea ?
>
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