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Date: Sat, 6 Nov 2004 17:12:29 -0700
From: Bob White <bob@bob-white.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: EWP
Message-Id: <20041106171229.18989869.bob@bob-white.com>
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I knew I had seen the current specs somewhere.  This was on Summit
Racing's web page for the Meziere WP-337

Vendor	Meziere Enterprises, Inc.
Product Line	Meziere Import Electric Water Pumps
Universal	Yes
Pump Material	Aluminum
Pump Finish	Black anodized
Flow Rate @ 12 Volts (gpm)	55 GPM
Flow Rate @ 16 Volts (gpm)	(Not Specified)
Hose Adapter Required	Yes
Hose Adapter Included	No
Hose Adapter Thread Size	1 in. NPT
Inlet Hose Size	(Not Specified)
Inlet Hose Attachment	(Not Specified)
Overall Depth (in)	(Not Specified)
Amperage Drawn	9-11
Weight (lbs)	6.2
Quantity	Sold individually.

So, the mfg is claiming 11 amps for the 55 gpm pump.

Bob White


On Sat, 6 Nov 2004 15:54:19 -0800
"Al Gietzen" <ALVentures@cox.net> wrote:

> Based on Todd's correction of the earlier unbelievable numbers on
> current drawer, you can expect somewhere in the neighborhood of 35-40
> amps continuous for 25 gpm of flow (which is believable) - if the pump
> will produce that much flow in a real cooling system.  That's based on
> the pump power going roughly as the square of the flow rate. 
> 
>  
> 
> Al
> 
>  
> 
> -----Original Message-----
> From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
> On Behalf Of Todd Bartrim
> Sent: Saturday, November 06, 2004 1:28 PM
> To: Rotary motors in aircraft
> Subject: [FlyRotary] Re: EWP
> 
>  
> 
> Whoaa, before anybody gets worked up over my current draw figures, I'd
> made a mistake in my report and had sent another post correcting it
> the next day. Below is the corrected post.... hmmnn, is there a way of
> going back into the archives to correct erroneous data, as this same
> issue came up once before based on my incorrect data post.
> 
>  
> 
> Hi Guy's
>         I had a hard time believing the current draw for the pump so I
> brought home my good "Fluke" multimeter from work. The one I used last
> night was a cheap Digital meter from "Canadian Tire". I seldom use
> this one, so I'm not familiar with it but since it is very similar in
> outward appearance to my "Fluke 87" I assumed the same functions would
> apply. They don't.
> 
>  OK,OK, enough excuses, now for the real current draw.
> 
> *        continuous current draw - 4.3 amps 
> 
> *        max inrush current draw at 100mS - 6.8 amps 
> 
> *        max inrush current draw at 250uS - 13 amps 
> 
> *        continuous current draw at minimum controlled flow - .2 amps
> 
> The max inrush current is not really relevant to our concerns, but
> there it is for those that care.
> 
> This higher current flow is still well within acceptable limits for my
> needs, and I expect that while in cruise flight, the controller will
> be reducing pump speed and current draw.
> 
> I've reposted the flow measurements along with this post with the
> incorrect current draw deleted. I hope this clears up any confusion
> about EWP current requirements. I 
> 
> 
>         I ran the first test with the Ford evap cores in the system,
>         plumbed
> in parallel.
> 
> *        Max flow 9.3 usg/m  35 l/m 
> 
> *        12.07 volt battery supply voltage 
> 
> *         
> 
>     Second test had no evap cores in the system. Simply recirced water
> through pump - engine - header tank - pump.
> 
> *        max flow 13.0 usg/m   49 l/m 
> 
> *        12.06 volt battery supply voltage 
> 
> *         
> 
>     Third test, I plumbed in a set of GM (Harrison) evap cores in
>     parallel,
> into the system. I hung them just below my mounted Ford cores, using
> they same pipe sizes in an effort to have comparable test conditions.
> 
> *        max flow 7.7 usg/m   29 l/m 
> 
> *        12.4 volts supply voltage (I hooked a trickle charger to the
> battery) 
> 
> *         
> 
>     In each test configuration test results are with heater valve
>     closed.
> Heater core added .5 usg/m in each case.
> 
>  
> 
>     In all of the above tests the electronic pump controller was
>     bypassed to
> give full battery voltage to the pump. With the pump controller in
> use, as the water was cold well water, controller had pump at minimum
> flow which was measured at .6 usg/m - 2.2 l/m. 
> 
>  
> 
> I've just been lurking since returning from school as I've got allot
> to catch up on around here, so am trying not to get distracted with
> the list, however I needed to jump in on this one. I need to head out
> to the airport today to install my new radio and hopefully get out for
> a flight, as they are calling for 5" of snow tonight.
> 
>  
> 
> Todd Bartrim
> 
>  
> 
> RV9Endurance
> 
> 13B Turbo Rotary
> 
> C-FSTB
> 
> http://www3.telus.net/haywire/RV-9/C-FSTB.htm
> 
>  
> 
>              "The world will always have a place for those that bring
>              hard
> work and determination to the things they do."
> 
>  
> 
> 


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