Steve Brooks wrote:

>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.
>
>  >
The advantage out of a 50/50 mix is that it will
boil at a higher temp and freeze at a lower temp than any other ratio of
water/antifreeze. Ask any high school chemistry teacher.  Improved cooling
is not typically one of the benefits seen, if all other variables are
kept equal.

Glad you had an uneventful flight.

Dave

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