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Re: REFLECTOR: NACA air scoop design
You can get NACA scoop design information from the NASA web page
(WWW.NASA.gov). Go to the technical database and enter the key words NACA
scoop. A lot of the NACA information (although dating back a few years) is
available in full text.
Also, a few good articles in previous months of Kitplanes by Barnaby Winfran
(I think that is how you spell his last name) covered the placement of inlet
Yes, placing the inlet scoop on the bottom exiting to the top or sides is the
better way (i.e., high pressure to low pressure), but other considerations
are equally important (such as keeping the air flow from separating (i.e.,
turbulent flow). In fact, I believe that is why a lot of Velocities have oil
cooling problems. In other words, the 90 degree bend immediate following the
oil core causes flow separation which greatly reduces its efficiency. People
have made up for this by installing another oil cooler or larger lines, but
this adds more drag which is unnecessary if the design was better. You could
increase the efficiency of the one oil cooler by fabricating vanes to keep
the air from separating while turning 90 degrees (of course at a slight
increase in drag).
Just my humble opinion . . .
N767SD Std RG Elite