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One last thought about the spreadsheet. Like any real world model contraption, the actual correlation to the real world by the model seldom ever takes everthing into account. You really want to try and capture the crucial elements - the trouble is the crucial element may change from one factor to another depending on the real world situation and how accurately the model works in that situation.
Additionally, just finding values for those crucial factors is seldom easy. The acid test in my opinion, is to plug your values into the model and see how close/bad it matches what you are actually seeing in the real world. If adjusting parameters in the model seem to track with actual results then model is probably OK, otherwise probably not.
Ed
------ Original Message ------
Sent: 2/26/2022 10:48:51 AM
Subject: [FlyRotary] Re: Ed's spreadsheet
I agree, must have got it from someplace credible - like Bill Shertz. CP was 1.0 for pure H20 and somewhat less with antifreeze mixed in. I had a primary pully from MazdaTrix that reduced water pump speed - since engine was turning faster than normal in automobile, did not want to have any cavitation. So my water pump did turn a bit slower than stock. Not necessarily - note that water flow drops off if pump speed increases into the "caviation range"
------ Original Message ------
Sent: 2/25/2022 10:39:43 AM
Subject: [FlyRotary] Re: Ed's spreadsheet
Thanks Ed.
But 185.85 seems pretty detailed for a SWAG.
Any chance you got it from Bill Shertz's tests (which I
unfortunately can't find the posts about)?
What determines "Cp Coolant"?
Heat transfer efficiency from engine to water and water to rad?
From measuring the rims of the e-shaft pulley (122mm) and water
pump pulley (112mm) it looks like the Renesis water pump runs a
bit slower (factor 1.09 compared to your 1.18).
Should water flow be directly proportional to water pump RPM?
Finn
On 2/25/2022 10:07 AM, eanderson@carolina.rr.com wrote:
Sorry, Finn.
Too much water under the bridge, pretty sure I did not make
it up out of thin air. I suspect I visited some pump websites
to arrive at a SWAG.
Ed
------ Original Message ------
Sent: 2/24/2022 2:25:56 PM
Subject: [FlyRotary] Ed's spreadsheet
Hi Ed,
From where did you get the 13B coolant
flow numbers (Pump Factor)?
I want to be certain that I have
adequate coolant flow.
Finn
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