Jeff Spitzer wrote:

MAR34807@aol.com wrote:

I just finished reading the latest EAA mag article about the

aerodynamics of

WWII fighters by Dave Lednicer. The P51 cooling duct was discussed in great
detail, and included was the pressure distribution analysis of the

"boundary

layer seperation" in the cooling intake and how it affected the different
radiators/coolers/intercoolers.

Separation is not always avoidable.  Desperate times call for desperate
measures.  I have designed cooling ducts where separation upstream of the
radiator was better than the alternatives as long as it "reattaches" and
makes full use of the cooler.  I suspect that the P51 duct was a similar
situation.

Jeff Spitzer

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