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From: ACRE <rotaryeng@earthlink.net>
Organization: ACRE
Date: Thu, 18 Nov 2004 21:08:14 -0800
Subject: Mezier electric water pump.
I kind person loaned me a Mezier electric water pump to run some numbers
on. I want to thank you for that.
First thing I noticed was the 20 AMP fuse in the 12 gage motor
wiring. Whoa! Wait a minute! That is a limit of 20 amps times 13 volts or
260 watts
or .35 HP. As soon as you put some back pressure on this pump either
the impeller will cavitate or the fuse will blow. The stock pump handles
ten times that amount of HP or around 3.
Then I took it apart and saw the unsophisticated toy impeller and decided
testing it was a waste of time. A stock Mazda second gen impeller looks
like rocket science along side this toy. I expected a much better design
based on the questionable advertising claims.
The inlet and out let holes are limited AN -12 or 3/4 inch ID.
No way in hell are you going to get much flow through 3/4 inch holes both
on the inlet and the outlet. That is .44 square inches and the usual
water plumbing is 1.5 inch or 1.76 square inches or four times more
flow area. No way to increase the size of this plumbing.
In order to test this pump I would need to adapt the 3/4 inch plumbing
to the 1-1/2 plumbing of my water pump test rig. Not worth it!!!
Using this pump in a high powered aircraft engine risks cracking the
rotor housings due to local if not over all overheating.
Paul Lamar
The Rotary Engine NewsLetter. Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/
Copyright 1998-2004 All world wide rights reserved.
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