-------------- Original message from "Steve Brooks" <cozy4pilot@gmail.com>: --------------

George,

 

The cooling fan has some resistance when the power is off, and while I don’t know for sure, I doubt that it spins when the power is off.  Form a longevity perspective of the bearings, I hope that it does not.

 

Regards,

 

Steve Brooks

 

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On Behalf Of George Lendich
Sent: Saturday, August 09, 2008 5:47 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: 2nd flight on the new cooling system

 

Steve,

Does the cooling fan spin freely when turned off or does it remain static. 

Those temps are much better. 

George ( down under)

I took the Cozy up this morning for the 2^nd flight on the new cooling system.  The OAT was 3 or 4 degrees warmer than the first flight, as it was 79 F when I took off.

This time, I turned the cooling fan on while I was taxiing out to the runway.  After the  taxi and pre-flight checks, the oil was 135 F and the coolant was still reading pretty low.  Maybe 115 to 120 or so.  It is a little hard to read the analog gauge down on the low end of the scale.

 

I took off and climbed up to about 1300 FT AGL, at which time I pulled the throttle back some and continued a cruise climb.  The coolant was showing about 190F, and I didn’t think to check the oil temperature.  Oil temperature has not been my issue.  It has always been the coolant.  The coolant temperature did still increase a little, even at the reduced power, but just up to 200 F.  I was close to a low cloud layer at about 1800 AGL, so I throttle back some more and dropped the nose to level flight.  I also turned off the cooling fan to see what the temperature would do on it’s own.  The temperature steadily dropped to about 180 degrees within just a few minutes, and then stabilized there. 

 

I cruised around for a little while, flew over my house and circled it once, and then headed back to the airport.  With the low cloud layer that had moved in, I really didn’t know if it was going to clear out or get thicker, so I flew the 5 minutes back to the airport, and made a normal landing.  As I was ready to throttle back to descend about 800 feet to pattern altitude, and quick check of the coolant temperature showed about 160 degrees.  Not bad at all, although I was probably flying at about 60% power.  Still, it would have not been nearly that low before the new cooling system.

 

Once I landed and was clearing the runway, I checked the temperatures again, and the coolant was less then 140 degrees after the glide in to land.  Since I planned to wash the plane, and sometimes it starts hard after getting heat soaked sitting after a run, I turned on the cooling fan while a taxied over to the where the wash area is.  After washing the plane, it started up pretty easily, so I guess that worked out also.

 

So far so good.  I like what I see so far on the radiator, and the cooling fan definitely gives me a lot more options.

 

Steve Brooks

Cozy N75CZ

13B turbo to read the an