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Wendell,
I don't think I ever posted any photos, but here are a couple. I the photo
of the radiator set up, also was ducting air to the oil cooler which sat on
top. When that didn't work, I removed the oil cooler from the main duct,
and installed two 25 sq in armpit ducts on the lower cowling.
One duct is for the oil cooler, and the other feeds fresh air to the intake
(turbo charger), and also cooling air to the intercooler.
I have a couple of VG's mounted on the belly for the main scoop, which
helped a lot, but didn't need to do anything for the armpit scoops. The oil
cooling seems to be pretty sufficient.
Steve
-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On
Behalf Of Wendell Voto
Sent: Monday, July 23, 2007 2:12 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Flying
Steve,
Have you posted any pics of your cooling set-up?
If not could you and would you?
Wendell (Cozy in the works)
I've been working so many hours lately that I really have not had much
time
for flying. It had been a month since I had flown my turbo rotary powered
Cozy IV, though I had run it on two occasions prior.
On the 4th of July, I drained the anti-freeze, and replaced it with
distilled water. Well, maybe 5% antifreeze is left, but not more than
that.
I took of this morning, with the OAT at 70 degrees. I took off at my
usual
5 lbs of boost on the turbo, and rotated at 80 knots about 1500 feet
later.
While the flight was outstanding, with smooth air an nearly unlimited
visibility, I did not see any marked improvement in the straight water,
over
the 50/50 water / antifreeze mixture.
While acceptable, my cruise temperatures were at 190 for the coolant and
the
oil. My coolant maybe was a little lower than normal on climb, but then I
didn't climb up too far, only about 1000 ft AGL. Coolant only peaked at
200, maybe 205 at the worse.
After stabilizing and cruising around for a few minutes, I pushed the
power
up to about 75 %. The coolant rose slightly and so did the oil at
approximately 195. The only time I see the 160 degree temperatures on the
coolant, is when I reduce power to about 55%. The higher the power
setting,
the higher the temperatures. The exception being when the OAT is less
then
about 50 degrees. Then I have no trouble at all. Maybe I need to move to
Alaska.
Currently my two evaporator cores sit at about a 30 degree angle to the
incoming air, so I could probably make some improvement with some turning
vanes. Or, as I have been investigating, a custom made radiator, which
could sit directly in line with the incoming air flow.
My oil does not seem to be an issue. It always lags the coolant by 20
degrees or so, and then stabilizes to the same temperature as the coolant
after 5 minutes or so of flight. I actually can improve the oil cooling
by
some turning vanes there as well. I just never have because it isn't a
big
of issue. More oil cooling though may very well help the overall cooling.
At any rate, I only flew for about 30 minutes, but it was very nice.
Especially for summer flying in North Carolina. Very few days that cool ,
and with low humidity. The rotary performed flawlessly, as it always
does.
Steve Brooks
Cozy MKIV N75CZ - 52 hours
turbo 13B
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