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From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-729060@logan.com>
Subject: Re: [FlyRotary] example of exit area on cooling
Date: Mon, 14 Feb 2005 21:05:30 -0500
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Bernie,

My experience was/is that what keeps my airplane cool on the ground won't
necessarily do it in the air and vice versa.  When I fly my total radiator
inlet is 28 sq inches (Oil cooler another 22-24 sq inches).  I can run WOT
in the air and not have my temps climb above 200F.

On the ground with the ducts on, I will hit 200F+ at WOT in the matter of a
minute or two.  Now, if I take my ducts off while doing ground runups I can
operate much longer 5-10+ minutes (depending on OAT) without over 200F.  So
I have my ducts attached to the radiators with two hinge halves and when
doing extended run ups on the ground, I just pull the two pins and remove
the ducts exposing all the core to the relative slow moving air.

FWIF

Ed A
----- Original Message -----
From: <jbker@juno.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Monday, February 14, 2005 8:56 PM
Subject: [FlyRotary] example of exit area on cooling


>
> Rusty, you are right man just fly the airplane uncowled and it will cool.
My oil cooler with the nice diffuser inlet duct and no cowl ran the oil very
cool. Today I ran the with the cowl on. If anything you would think my inlet
flow would have been better because all the cowl does is add a nice small
bellmouth to the duct. My total exit area for radiator, cooler, and 2.5 in
dia exhaust pipe is approximately 30 square inches. Ran 29.5 inches of
manifold pressure for 1.5 minutes topped the 220 degree farenheit oil temp
with 78 OAT. It was about 180 when I started the power run. Have not
calibrated the oil measurement and it is the hot inlet side of the oil
cooler. I know Tracy wants to measure the cool side and I have the TC
clamped to the fitting but have not chased down where it reads on the
monitor. Will do that before I run with cowling again.
>
> Called the DAR today and FAX'ed my registration and Wt&Bal sheet to him.
>
> Bernie, getting closer every day by exactly one day!
>
> >>  Homepage:  http://www.flyrotary.com/
> >>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
>