bcgardner wrote:

Guys, I realize that water has some disadvantages as a coolant for any
length of time. However, would it be a good idea to replace one's normal
glycol mix with distilled water prior to one's initial test flight(s) to
give a little extra margin on the cooling system? If adequate cooling is

the

great unknown for first flights, then an extra bit of margin would be

great

to have during that first hour cruising in one's new experimental.

Replace

it with the original glycol on the ground. I have a hard time believing

that

using it for an hour or two could lead to instant problems and it

certainly

would be an easy little safety margin during first flight.

Just a thought, though maybe the difference is insignificant.

Barry Gardner
Wheaton, IL

marc mularz wrote:

I started my testing of anti-freeze/water ratios on corrosion of an iron
nail last friday morning.  By fri. afternoon when I left work, the distilled
water/nail had already been covered on 50 % of its surface with rust!!! No
sign of corrosion on the other nails yet (10 through 50 % ethylene glycol).
Remember, once the corrosion starts, adding antifreeze may inhibit some
further corrosion but whats there is there and is likely to get worse.  Will
report on the rest of the experiment next week.  I'll also do a quick check
on the specific heat of 50/50 EG and Water this week if anyone is
interested.
Take care,
Marc M

 
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