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Message
Thanks, Mark....I was fairly confident that was the
problem. Prior to installing the ram air scoop I could cool in the climb. Water
temps went from 180 to 205 at the same power settings. With all that air
rushing in through that huge ram air scoop, I'm surprised the air didn't go
through the radiator backwards. (It was probably trying to). Probably
fighting the incoming flow from the large underbelly NACA through the
radiator. I removed the ram air scoop today and made an aluminum plenum
with a 3 inch hose outlet. As soon as the 3" outlet NACA duct arrives (from
Aircraft Spruce) I will glass it in and give it a try. I'm convinced that
dumping the air directly into the plenum is the way to go, rather than dumping
it into the low pressure area of the cowling near the throttlebody, hoping some
of it would be sucked into the engine. Oh well, live and
learn. Fortunately, I haven't painted my plane yet. Much easier
to do these mods in primer. Paul Conner
----- Original Message -----
Sent: Monday, April 11, 2005 8:01
AM
Subject: [FlyRotary] Re: SQ2000 flying
again
Paul,
Just to chime in
here, we were just last week discussing the importance of minimizing the
pressure behind the radiator. By dumping air into the cowl, you have
reduced the airflow across the radiator core. Ducting the engine intake
air directly into the TB will reduce the pressure behind the radiator and
should improve cooling.
Mark S.
(been reading chapter
12…learned enough to be dangerous)
From:
Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Paul
Sent: Sunday, April 10, 2005 7:24
PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: SQ2000 flying
again
Hi, Rusty....yes, the air is
dumped directly into the cowling in the vicinity of the throttle body. I
reduced the throttle to 4900 rpm's, and temps did not come down in the climb.
Prior to installing the ram air scoop, my temps would actually drop during a
climb at 4900 rpm's, so I believe the ram air scoop to be the culprit. I
have a NACA duct and some 3 inch tubing on the way. I am going to build an
airtight plenum over the throttlebody and the NACA duct/sceet tubing will
deliver fresh air to the throttlebody ONLY and not dump it into the low
pressure area of the cowling, thus inhibiting my cooling. I guess that's
why they call it experimental. Paul
Conner
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