Marc de Piolenc wrote:

2. Most people, as already pointed out, don't read the original papers,
so they are not aware of  the fact that the scoop shape is much more
complex than in the usual modern implementation. In particular, there is
a lip that is intended to "fold" the local boundary layer to reduce the
effect of "approach loss" due to boundary layer growth. I have literally
never seen a lip on a NACA inlet in the field.

Best,
Marc de Piolenc

You can see it on this one.

Paul Lamar

Marc de Piolenc wrote:

That one's better than most, but the side lip is still missing.

Marc

Just about everything has been tried to get them to work with heat exchangers.
I have seen them with side lips. NACA scoops barely work with low pressure drop air 
cooled engines. My next door neighbor with a Long EZ tells me cooling is
marginal. Climb compromises are common.

If the lip was effective I am sure Boeing would use it instead of that high
drag, high angle of attack delta wing.

Paul Lamar 

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