"Getting the NACA duct"!!! The ones that you can buy are junk, I have lots of 3003, tin snips, hammers, TIG welder and the chart of dimensional relationships required to build a NACA duct with the right dimensions, screw buying a piece of junk when I can build my own!!!!! I will size the opening based upon 220 mph, my motor at 12,000 rpm and a fudge factor that will be determined when I start the project.
Rex