We decided to move our combustion air and firewall oil cooler runner ducts from flat bottom-facing duct connections to side exiting ducts. We’re also making the ends permanently attached to the firewall so they are very rigid, as we’d had issues with them pulling the cowl screw out and collapsing. We’re also added a little airfoil shape to the NACA nose to improve flow hopefully.

Runner split line tabs

Moving aux runner air feed to the sides

Posted By: Brett Ferrell
Friday September 18th, 2009 at 10:44 PM

Categories: Cooling NACA and Cooling Plenum
Tags: Building Cooling Fuselage NACA

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