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John,
The 1-3/4 is from the fuselage to the inside of the scoop. Measuring from
the NACA which is recessed would be about another 1-3/4 for a total of
3-1/2". Maybe I didn't explain that very well.
-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of John Slade
Sent: Sunday, June 06, 2004 7:58 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: opinion
the inside of the scoop measures 1-3/4" high by 15-3/4" wide.
That's strange. My NACA scoop is built per plans. How come yours is 1 3/4
wide? Are we measuring the same thing? From the floor of the scoop to the
inside edge of the airfoil mine measures 3.25 * 15.4 for a total square area
of about 50 sq inches. I don't have any additional scoops and so far my
cooling seems adequate.
Today when flying straight and level, when I increased
throttle, and increased speed, I also increased in oil and coolant
temperature, which tells me that I don't have enough air flow, or
velocity, or pressure, or whatever the correct term is.
I think this would be expected. Increase power and temperatures will go up,
at least initially. Does it stabilize at an acceptable temperature, or does
it continue to climb?
As it turns out, I have some time to work on the scoop, especially since
I'll be doing a little fiberglass work anyway.
You could be going in the wrong direction here, Steve. I didn't do much in
the way of contouring the intake areas, but I did make a bit of a duct.
Maybe that's helping. The augmented exhaust may also be contributing.
I'd suggest more testing at different speeds and outside air temps before
hacking at the scoops.
Regards,
John
Homepage: http://www.flyrotary.com/
Archive: http://lancaironline.net/lists/flyrotary/List.html
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