Al Gietzen wrote:

Subject:        High boiling point coolant.

-------------------------------- Water --- 50/50 EGW --- Evans
-------------------------------- @16 psi -- @16 psi ---- @0 psi
Boiling Point ---------- F ----- 252 ------ 268 --------- 369
Viscosity 212 F ------- cp ----- 0.28 ----- 0.7 --------- 2.35

Aside from the other reasons not to use propylene glycol; has anyone
considered the pumping power it would take to pump 1.4 times as much coolant
that has nearly 10 times higher viscosity?

Al

Al, I did run Evans 100% polypropylene for a short period in my 20B (seemed to
be okay for ground runs). I didn't fly with it because when I talked to them
about cold weather at high altitude, they said that there had been some engine
damage due to high viscosity at low temps causing localized overheating. The
water pump couldn't pump the thick fluid fast enough thru the cold radiator.
They suggested strongly that this was not a good application for their product.
Chuck

 
The AirCraft Rotary Engine NewsLetter.              Powered by Linux.

http://home.earthlink.net/~rotaryeng/            http://www.linux.org