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Dave, I want to look up properties of NPG at my
hanger later today, I am sure that it is miscible with water, so any residual
coolant/water left in the system would just go into solution, not boil and force
the coolant out.
Things to consider in your post mortem.
1. Possibility of stop leak plugging channels
in radiator. This could have an increased effect due to #2
below.
2. Increased viscosity of NPG vs water -- You were
flying in very cold conditions, and therefore when you are circulating the NPG,
it can cool off a lot in the radiator -- this will make it more viscous, at the
cool end of the radiator, then this increases the load on the pump that is
trying to push the fluid around the loop. The temperature in your engine may
have been climbing before indication on your guage, depending on where the guage
is located.
3. Increase load on pump -- could this cause belt
to start slipping/overheat/fail -- look for signs of hot rubber on belt
pulley.
I will dig out information on NPG this
afternoon.
Bill Schertz
KIS Cruiser # 4045
----- Original Message -----
Sent: Monday, January 16, 2006 11:53
AM
Subject: [FlyRotary] Re: Anatomy of an
almost crash.
Bill,
This is a good point and something I have been thinking about. The
added NPG was 100% PG but there was obviously a little bit of aquious PG left
in the system. I tried to burn it off during my hour long ground run,
but the temp never got very high (toped out at about 180). That little
bit of water may have boiled over and forced out the evans...
Someone else brought up the 7 psi cap with altitude. That is also a
possibility - actually a combination of both.
On 1/16/06, William
<wschertz@ispwest.com>
wrote:
Dave,
When you switched to Evans coolant, was it at
100% Proplyene Glycol?
Bill Schertz
KIS Cruiser # 4045
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