Here are two pictures of a very fast Tailwind  built by Red Hamilton
that I have taken from the Tailwind list.  I am sure they don't mind.
 The first photo shows an angled intake which did not work because it
was in the boundary layer. There was NO increase in MP.    The second
photo shows the improved intake which produced .4"Hg more MP.  In the
second example, the prop clears the intake by only  1/2 inch.

 I was surprised that the boundary layer formed so fast in the buffeting
air coming off of the prop.     It is something we need to keep in mind
when building the belly inlet for our rads and oil coolers.

Jerry

I didn't get any pix.

Doc Custer
Retired Software Engineer and sometime Audiologist



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