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It has been a couple of years but I did read the NASA report that said the NACA style duct was not recommended for induction or cooling. The report was based on experimentation. I believe it stated that the max pressure recovery of NACA duct was .8. Sorry I can't refer you to the document except to say it was in the NACA archives. Jerry
On Oct 19, 2005, at 9:05 AM, Ernest Christley wrote:
rijakits wrote:
Remember the inventors of the NACA-duct did recommend to NOT use
it as a pressure-recovery intake (what we need for our our car
style radiators)
I've heard this repeated so many times, and yet I've never been able to find the report that said it. I believe it is well on its way to becoming an old-wives-tale. I've looked for a while in vain to find the exact quote this morning, but the closest I've been able to find was more along the lines of "we didn't test that, so we don't recommend it."
"We don't recommend it, because we haven't tested it" is NOT the same as, "we don't recommend it because we found it doesn't work."
All of the reports are online at naca.larc.nasa.gov. That address starts you at the search page. 'submerged inlet' brings up the reports on NACA scoops, with the most germaine for our purposes being located at http://naca.larc.nasa.gov/reports/1951/naca-tn-2323/ . I'll keep looking for the quote I'm referring to above, but I would really appreciate a pointer to the report that says, "We found submerged inlets to be deficient for use with radiators."
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