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Gentlemen,
I will try to phrase this question so as not to reveal my stupidity but - if you are going to test EWP's and EDWP's for pressure, volume and amp draw comparisons why not set them up with an engine block and a couple of radiators and get some real factual data from these comparisons. I am failing to see what the value of the tests are when pumping from a barrel of water to another barrel. The very best test would be to use a running engine installed on an aircraft and keep changing the pumps and recording the data. There must be someone out there with nothing else to do :)
Thank you,
Randy
On Apr 1, 2005, at 1:30 PM, DaveLeonard wrote:
Bob, Jim is right. The best way is a flow vs. pressure. The work to get
the fluid through the entire system is likely going to be more than what you
tested. I will bet dollars for doughnuts that the more expensive/larger
pump will perform better at the higher pressures.
Think of the difference between a cheap handheld electric drill, and a drill
press. Under no load, the hand-held drill spins much faster than the drill
press. But put on a load and the small drill quickly slows down and stops,
the drill press is unaffected.
Dave Leonard
It would be interesting to put a valve downstream from the pump and
close it just a tad (perhaps measure pressure drop across the valve or
perhaps across the pump) and see how a restriction affects flow.
Inquiring minds need to know :o) ... Jim S.
Bob White wrote:
Hi Dave,
The only restriction was the hoses I used for the test and the
flow meter. Flow
was out of the bucket about an inch from the bottom thru the
test setup and back
into the top of the bucket with the hose submerged. The hose
sizes are similar
to what I'm planning on using in the plane.
Bob W.
On Thu, 31 Mar 2005 05:38:42 -0800
"DaveLeonard" <daveleonard@cox.net> wrote:
MessageBob was there any resistance to flow? The could perform quite
differently if they are pumping against resistance.
Dave Leonard
Th e tiny D-C pump outperforms the WP136.
Great report Bob! Sounds like the little plastic Davies
Craig pump is the
hands down winner over the WP136 Meziere. I'm not too
concerned about the
motor temp, because it's obviously made to run that hot, and
still give good
service life. The best part about the test is that you did it,
and my WP136
is still new in the box. Now I can send it back to Summit for
a refund :-)
Cheers,
Rusty (hoping for two successful posts in a row)
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