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From: "Wendell Voto" <jwvoto@itlnet.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-2193062@logan.com>
Subject: Re: [FlyRotary] Flying
Date: Mon, 23 Jul 2007 13:12:24 -0500
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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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