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Al Gietzen wrote:
Well; I may end up with VGs and change in upper duct wall shape. My intention yesterday was to install VGs as a first step, test fly, measure pressure and temps; then proceed with installing sheet metal upper duct wall change.
I think I may be late for the party, but sometimes good ideas take really long to germinate.
Maybe the hole you have at the top of your cooler, caused by settling, is a blessing in disguise. You can possibly use it to pass the worst of the boundary layer air through the duct. Use an aluminum sheet, .040 thick should work, and bend a lip on it. Have it come out in front of the scoop to catch the boundary layer and pass it around the cooler (yes, just like Mr. Lamar himself suggested). A few threaded standoffs at the front of the sheet would give you nicely even, and quite possibly attractive spacing. You would want to make sure that the top of the lip gets pressed down and seals to the top of the core. Tape on a few wedges of 1/2" blue foam and see if it works. If it does, wait for everything to cool off then pull the aluminum out and the foam will be compressed to the proper shape. Remove the tape and glass the foam down.
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