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Hi Jerry,
I'm using the Mezarie WP136 water pumps. I have most of the pieces to
put everything together, but have not installed them on the plane yet.
PL did finally put it on his closed loop system:
"It started cavitating at 6 psi back pressure with no discernible
flow on the flow meter. Off scale on the bottom of the
flow meter. You could hear and feel it rattle. I could not
believe what I was seeing and I had Kluse come over and verify
what was happening and see if I was doing something wrong.
We bleed the flow meter and the pump. Same thing." said Paul Lamar
Of course I had already told him the head pressure was 6 psi for the
pump. Whether or not 6 psi is enough remains to be seen. I will
initially test two pumps in parallel, and if the flow/cooling isn't
enough, I will try them in series. In series the head pressure is 12
psi. (I've already measured it.) Which method will result in the most
flow depends on how much restriction there is in the rest of the system.
If it is very low, parallel will have higher flow, and if it is higher,
series will be better.
Here is a link to the analysis Bill Schertz did on Todd Bartram's
cooling system: http://www.acre-media.org/schertz/EWP_analysis.html
Bill's analysis would indicate that Todd's system was marginally
adequate given the assumptions used. Some were overly conservative, and
Todd has reported better results than would be expected from the
analysis.
On Fri, 14 Jan 2005 12:27:04 -0500
Jerry Hey <j-winddesigns@thegrid.net> wrote:
> Thanks Bob. Which EWP are you using? Do you have it installed? I
> remember when PL received it, he immediately said he was not going
> through with the tests after all because it was obviously not going
> to work. I now wonder if that was a way of dodging the numbers? I
> never heard more about it. Jerry
>
>
>
>
> On Thursday, January 13, 2005, at 07:51 PM, Bob White wrote:
>
> > Hi Jerry,
> >
> > I'll be doing some tests on my engine shortly. It was Todd and
> > Rusty's experiences with EWP's that convinced me to give them a try.
> >
> > I sent Paul L. the EWP after he had asked someone to send him one
> > for testing. I expected him to badmouth it, but to also generate
> > some actual
> > flow vs current vs pressure data, but I haven't seen the data part.
> > :) I
> > now have enough stuff to get flow vs current data on the engine with
> > the evaporator cores that I will be using, and get some cooling
> > results as soon as I get the engine running.
> >
> > If we had lowered the thrust line a couple of inches when you built
> > my motor mount, I could have probably squeezed the water pump in,
> > and left the alternator on top.
> >
> > Bob White
> >
>
--
http://www.bob-white.com
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