Mailing List flyrotary@lancaironline.net Message #26586
From: George Lendich <lendich@optusnet.com.au>
Subject: Re: [FlyRotary] Re: Optimal GPM water pump flow.
Date: Mon, 12 Sep 2005 16:40:36 +1000
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Dave,
I don't know for sure myself but the so called experts on another site recommend that 2 cooler should run in parallel - FWIW.
George ( down under)
Al.
   What I am after is trying to determine what the minimum required flow is for the horsepower generated.  More than anything else, I do not want to be BELOW that amount, and consider it a minimum. Understandably, trying to place twice or nearly 3 times the flow through the same circuit will result in higher pressures and perhaps some pump cavitation. I will deal with that as I have to.. more than anything else I want to make sure I am not starting off with a DEFICIT of water flow ability.
 
I am considering 2 smaller radiators, and originally I intended to plumb them in series to get the best cumulative Delta-T across them, but if I have "pressure" problems due to the pump's flow, I may go to a parralel arrangement.
 
Feel free to critique, Al.. My cooling system is a work in progress that is evolving. I live in a place that has 100 degree temps with 90% humidity at times, and given the other folks demonstrated problems with inadequate cooling, I am very much in favor of designing in excess cooling capacity, to the point I may even incur a slight weight or drag penalty, such that I don't have to give constant attention to the risk of overheating.
 
Dave

Al Gietzen wrote:

Subject: [FlyRotary] Re: Optimal GPM water pump flow.

 

www.racemate.com   They were unable to find the photo of the Mazda install but they say the did a few. I am going to take the plunge and get one.. 



Dave
 
Just curious what you’re after with the racemate.  You were asking about “optimal” flow – double the needed flow is not optimum; high pressure gradients around the loop, unnecessary pumping power.
 
Al
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