Stephen Wolpin wrote:

thanks for the visit today.

i look forward to seeing your osh pix and the nasa design link.

i'll get my plan together to measure some delta p's.
thanks again.

steve

OK Here is the URL

http://naca.larc.nasa.gov/

  1.Charles W. Frick, Wallace F. Davis, Lauros M. Randall and Emmet A. Mossman, An Experimental Investigation of NACA     Submerged-Duct Entrances, NACA ACR-5I20, November, 1945. 

    Abstract: The results of a preliminary investigation of submerged-duct entrances are presented. It is shown that an entrance of this type
    posses desirable critical speed and pressure recovery characteristics when used on a fuselage or nacelle in a region of low incremental
    velocity and thin boundary layer. The data obtained indicate that submerged entrances are most suitable for use with internal-flow
    system which diffuse the air only a small amount: for example, those used with jet motors which have axial-flow compressors. When
    complete diffusion of the air is required, fuselage-nose or wing leading-edge inlets may prove to be superior. The results of the
    investigation have been prepared in such a form as to permit their use by a designer and the application of these data to a specified design is discussed. 

Paul Lamar
 
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