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John, It sure looks to me like the airflow around
the outside of your triangle would produce a pumping effect in extracting or
aiding airflow out of the triangle. It looks like the outside flow
would speed up considerably as it conformed to the narrowing of the
fuselage at the triangle - provided it does not separate of course - would
probably depend on how fast it narrowed. Sort of like an inside-out
Bernoulli tube. This is similar to using an air compressor and
sucking liquid out of a container by the airflow past the opening of the tube
also. The effect is also used by some of you fiberglass types to
produce vacuum to hold down your vacuum bagging I believe.
It might be the single most important factor as to
why your NACA ducts appear to work so well while others might have problems with
them.
Ed
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message -----
Sent: Thursday, July 15, 2004 8:43
PM
Subject: [FlyRotary] Re: New Scoop
Looking at John's cooling set up,
it appears that the cooler core exits are in an excellent position to
benefit from any lower pressure region that may exist at the rear
of the canard fuselage.
Interesting. Maybe the triangle at the back
of the cowl is helping.
John
Slade (all guesswork, very little science)
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