Reply-To: <steve@tsisp.com>
From: "Steve Brooks" <steve@tsisp.com>
To: "Fly Rotary \(E-mail\)" <flyrotary@lancaironline.net>
Subject: opinion
Date: Sun, 6 Jun 2004 18:10:51 -0400
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Ed,]I wanted to get your opinion about increasing the size of my cooling
scoop.  The existing scoop is a NACA scoop upon which I extended the scoop
portion a little e bit to try to capture more air.  I took some measurements
today, and the inside of the scoop measures 1-3/4" high by 15-3/4" wide.
Now there is an additional area that same size which is recessed that is the
actual NACA inlet.  I'm not sure about how to calculate the inlet size, but
if you exclude the NACA, it is about 27.5 SQ IN, and if you include the NACA
area, about 55 SQ IN.

I am looking at building a scoop on the landing gear cover which extends 9"
forward of the current scoop.  I am looking at making the width of the scoop
21-3/4 inches, which is 3" wider on each side, and 1-5/8" taller (or deeper
depending on how you look at it).  That would make the inlet size 73.4 SQ
IN.  There is also the actual NACA inlet along that area that tapers toward
the front.  I don't know what the SQ IN of the NACA is on the cover, but I
could make some more measurements and calculate it if you think that it
would be significant.

I am interested in your feedback about the size, or from anyone else for
that matter.   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.

As it turns out, I have some time to work on the scoop, especially since
I'll be doing a little fiberglass work anyway.

Thanks,

Steve Brooks