From: "John Slade" <sladerj@bellsouth.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: RE: [FlyRotary] opinion
Date: Sun, 6 Jun 2004 19:57:37 -0400
Message-ID: <NMELKLCBIAJLEHHCHLJBIEHGDGAA.sladerj@bellsouth.net>
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> 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