60% antifreeze and 40% water is the lowest according
to this website which includes a chart:

http://www.gi.alaska.edu/ScienceForum/ASF6/680.html

Ron Springer
Folsom, CA

--- David Staten <Dastaten@earthlink.net> wrote:

 

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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