k

I notice the maximum pressure recovery is .86 for these ducts.

What does that mean to us in real terms?
John Slade, Cozy MKIV #757, progress: http://kgarden.com/cozy
West Palm Beach, FL

That means if you are going 100 MPH the dynamic pressure is
26 pounds per square foot or .18 psi. So 86% of the that is
.15 psi. It is 86% of what every the dynamic pressure is.
That is why ducts are described in pressure recovery terms.

Paul Lamar

Snip

The curve in the NACA duct helps induce a pair of inward rotating
fixed vortices.  These pull themselves down into the inlet and cause
the inlet to work.  I can't see how this would happen in reverse.

Bill

    Previous posts indicated that parallel sided ducts
are equal to diverging sided ducts up to about .70-.75
mach. Since most of us on this forum will be able to
keep well under those speeds I would like to hear more
opinions on the use of the parallel ducts.(easier to
build)

    Kell Troyer

Dyke Delta/13B Rotary Power

I have yet to see a NACA paper comparing the two. The extra work
is minimal.

Paul Lamar

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