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Sid & Houston Mayeux Project
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Date: 9-21-2014
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Number of Hours: 3.00
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Manual Reference: Cowling
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Brief Description: Cowling heat protection
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I'm really interested in making sure the lower cowl doesn't get baked by my exhaust systems, so I followed procedures spelled out by the folks at Vetterman Exhaust in a Spring 2014 Kitbuilder Magazine article.
First, I checked the clearance between my cowling and all sections of the exhaust system: My tightest clearance is 1", which exceeds the 1/2" minimum gap. With the lower cowling installed, I reached inside with a black sharpee and traced on the cowl the general area that encompasses the exhaust system's area. After removing the cowling, I used white posterboard to draw templates of that exhause area.
With the posterboard template, I cut out sheets of Fiberfrax, a ceramic cloth 1/16" thick with great insulation properties. I cemented these to the cowling with Pliobond, then covered this area with thick self-adhesive aluminum foil from Aircraft Spruce. I used a plastic squeegy to make the foil lay flat on the fiberfrax. I extended the foil beyond the Fiberfrax's edges by 3/4" to 2". Finally, I brushed clear epoxy onto all foil edges with an acid brush to seal the edges from oil, curl-up, etc.
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Drawing out the template
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Fiberfrax and foil installed, sealing the edges
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Lower Cowling heat-protected
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