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Concerning inlets.  Marv has on his website under 'Scoops & Ducts' three
NACA research papers from 1945, 1948, and 1951.  These papers indicate,
from empirical testing, that the most important part of the duct or inlet is
the
lip at the rear of the inlet.  It's airfoil shape is critical.  The 1951
paper also
points out that there needs to be a slight bump on the upper and lower edges to prevent the flow from leaving the aircraft surface and forming two vortices within the throat of the inlet.  I have yet to see any homebuilt
add these small ridges along the upper and lower sides. I am toying with the idea of using a pair of inlets on top of the cowling to

cool the engine in place of the High Drag Holes on the front.  Just a few thoughts. On well, back to work.

Ranny Fullinwider
Equiva Trading Inc.
(713) 277-5234

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Please send your photos and drawings to marvkaye@olsusa.com.