Message-ID: <008601c42812$6803ac10$0202a8c0@eric>
From: "Eric Ruttan" <ericruttan@chartermi.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-3183313@logan.com>
Subject: Re: [FlyRotary] Re: water coolant percentages
Date: Wed, 21 Apr 2004 22:34:58 -0400

I think we got a lot of apples and oranges being passed back and forth.

Cars in canada do use cardboard, but not, in my experience, because the rads
freeze, but because the cars stay warmer.
And many are diesels and they dont reject near as much heat so need all the
help they can get to keep the occupents warm in winter.
And I never changed my coolent because it was winter, but it never got hot
or cold enough to get out of the standard thermal range it was good for.
Also cars dont use 75% power crusing down the highway.  And cars are not
planes and planes are not cars.

I doubt you could freeze a rad on a plane with an open thermostat as the
fluid is moving and we put ALOT of heat in to the water and its ability to
give up heat diminishes as it cools.

But so as not to break with apparent tradition I will now go off on a
tangent, but keep the same subject heading.

In an automotive engine it has been my experience that if my thermostat
fails open my gas mileage goes down.  An expected event, I am told, as the
optimum engine temp is not reached with all this extra cooling.

I was wondering if all you flying fellows had ever considered this.  If you
did what did you do.  And if not why not?

When we all get Mr Andersons uber cooling math turned into something we
build that cures all the cooling woes on takeoff, wont we then have to worry
about, somehow, shutting it up for the "lean it out and cruse" portion of
the flight?

Not that we need to put the cart before the horse, but I was curious, and
thought we had 2 or three posts on the same topic already (not the subject
topic mind you) and so thought I would volenteer to change it this time.

Thanks for reading

Eric
----- Original Message ----- 
Subject: [FlyRotary] Re: water coolant percentages


>>I certainly can't prove this isn't true, but someone would sure have to
prove that >>it is, before I could believe it.  I just don't see how rapidly
moving, hot water is >>going to freeze.


>Rusty, move to Canada  ;-)  Most people up here regularly put card-board in
>front of their rad's.The card board covers the whole rad and at least in my
case, I >cut a 6" hole in it to provide a little airflow. If you don't do
this, the heater never >blows hot or even warm air. I've had it in the past
where I warmed up my car in >the drive-way.. drove 2-3 miles and it "gell'd"
on me in that short drive. And it >had the proper mixture for -40C temp's. I
don't know about breaking tubes but I >do know that it will freeze up, if
its in super cold air temps. Also keep in mind all >these car engines will
have thermostats in them, this effects this as well compared >to an engine
w/out one. But w/out a thermostat.. you'll never keep it at operating
>temp's when the OAT is in the -20's ++.

>My 2 cents
>Jarrett Johnson [glad spring is here!]