Contributed by: Mick
From Robert Paisley - Here is a good source of NACA vents for the bottom of the cowl. Robert used the 4"x9"x1" (C42-017) model:http://www.chassisshop.com/pdf/fabrication.pdf
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Mickey's RV8 Site
http://www.rv8.ch/article.php/20050819082228291