John;
It is unlikely that the NACA duct will
do anything. The duct leading away should be at least as large, or larger,
than the rectangular opening of the scoop. Also, it looks like the air
has to make a sudden 90 degree turn to go into the tube. It’s not
going to want to do that, so the air will just spill around the scoop.
Is there some reason to expect that the
pump needs cooling? You can just insolate the pump from surrounding heat;
and internal heat generated is carried away by the fuel.
Al
-----Original Message-----
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of John
Sent: Tuesday, September 15, 2009
4:45 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] cooling
Today I ran the plane with the
cowling on and I had it tied down.
After about 4 minutes the water and
oil temps started to climb and the engine started missing.
2 questions - will these
temperatures stabilize with the plane in motion and or climbing out.
will the NACA duct in it's present location at the rear of the cowling
cool the fuel pump. Enclosed are two pictures of the pump enclosure and
the NACA duct. The NACA duct has a 1 inch tube going down into the pump
enclosure. The engine ran ok when I switched it to carburetion. The
fuel pump line was hot. It ran fine on the FI this evening as it had
cooled and I had the cowling off. JohnD
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