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
>
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:  
>
http://mail.lancaironline.net:81/lists/flyrotary/List.html
>