> 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 ?
Hello Paul,
Standard E-glass BID and EZ Poxy have been successfully used to build
cooling plenums for pushers/canards (Long EZ, Varieze, etc.). Google
"downdraft cooling eze" for some details. You'll need to post cure
the plenums in order to elevate the temps at which the resin goes
"soft", so any resin system that benefits from a post cure should
suffice.
Folks have also impregnated 2 or 3 plies of BID cloth directly with
RTV to make their plenums. Sounds strange and messy, but it works.
Put down a piece of plastic drop cloth, add 1 ply of BID (cut to
shape), squirt on some RTV, add another piece of drop cloth, and use a
rolling pin to squish the RTV through the BID. Build it up to 3 plies
and, before it cures, pull off one side of drop cloth and stick the
exposed RTV directly onto your cylinder fins and mold the 3-ply sheet
to shape.
D
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