Yes total inlet area for radiators and oil cooler is now about 57 square
inches.  The one radiator duct only has an 9 square inche opening. The other
one and oil cooler remain for the moment at 24 square inches each.  I
suspect that the one radiator with the unmodified duct and the oil cooler
are picking up some of the heat load and coolant temp did increase by 5 F.
I am a little hesitant to reduce the other radiator to 9 square inches as
somehow my gut feel is that the coolant temp wouldn't just increase by
possible another 5F but considerably more - guess there is only one way to
find out {:>).

I think when this is said and done I will find I can reduce the ducts
through using my "modified" K&M profile inlets and still have adequate
cooling.  Perhaps both ducts might end up around 12-15 square inches.

I think there should be some decrease in cooling drag if I reduce the
intakes as that clearly shows the air that was going in wasn't doing as good
a job as it could - given the sharp wall turns I probably had a lot of air
flow turbulence and eddies. Also I need would then need to do something
about my 28x 4 1/2 air flow outlet to reduce the drag I am certain it is
causing.

But, right now I am trying to get manifold #4 done in time to fly it to
Shady Bend rotary flyin in October.  Do you plan on going?

Best Regards

Ed


----- Original Message -----
From: "Tommy James" <twjames@healed.org>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Sunday, September 14, 2003 2:32 PM
Subject: [FlyRotary] Size makes a difference


> Ed, as I remember, you oil cooling duct is 24 sq. in. plus the new 33 in
for
> coolant.  a total of about 57 sq. in.  Is that correct?  If so, that's
> mighty small, but apparently does the job.  There must be a good reduction
> of drag too.
> Regards,
> Tommy<><
>
>
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