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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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