From: bob mackey <nospam@pure-flight.com>
Date: October 28, 2004 10:12:54 PM EDT

Mark Ravinski observes:

As the prop rotates past the cooling air intakes I would suspect there gets to be a pressure pulse of some magnitude in the system. I also suspect that this pulse when acting on the cowling might contribute to the stress cracking (or spider cracking) commonly seen on higher time installations. This is a problem on Lancairs and a lot of other planes
using fiberglass cowling.

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BTW, we have read Dan Newland's suggestions concerning two-phase toughened epoxy resins and Applied Poleramic in particular. Following his suggestions, I called Rich Moulton at Applied Poleramic. He was very helpful and suggested that I try their DR-5 resin with EH-102 hardener.
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http://www.appliedpoleramic.com/
http://www.appliedpoleramic.com/ToughenedResinSystems.htm
Phone numbers and prices are on the website.

They didn't pay me to write any of this. I've been working with composites for a long time, and I am genuinely impressed with this product.
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