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Date: Mon, 21 Mar 2005 20:00:02 -0700
From: Bob White <rlwhite@comcast.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] EWP: How much is enough
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Hi Ernest,

Problem is, what have you learned.   It might be good data, but won't give "The
Answer".

The real question is what effect the various delta T's will have on engine
life.  I have no doubt that more flow is better at keeping the engine at a more
uniform temperature, but have no idea what that means for engine life.

There are other problems as well.  You really need to be flying, probably at
climb power, and a cooling system designed for high flow will differ from one
designed for low flow.  So there are really a lot of variables that would have
to be correlated to understand what's going on.  I think Bill's analysis
technique give a pretty good theoretical starting point, but won't give "The
Answer" either.

Bob W. (Experiment comming.  All I need to do is get the %^&* engine running.)

On Mon, 21 Mar 2005 21:09:14 -0500
Ernest Christley <echristley@nc.rr.com> wrote:


> 
> -mount thermocouples to measure the water temp going in and coming out 
> of the engine.
> -mount a flowmeter inline
> -connect a variable voltage source across the EWP
> -run the engine up to normal operating temp
> -using a rheostats or some type of regulator, start the EWP at 14V and 
> measure the deltaT across the engine after it stabilizes.
> -successively drop the voltage in 1/2 or 1/4 V increments, recording the 
> flow, letting the temps stabilize and then recording at each step.
> 
> Graphing the results should tell us what flow will give what deltaT.
> 


-- 
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