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Date: Sat, 06 Nov 2004 21:44:26 -0500
Subject: Re: [FlyRotary] Re: EWP Info
From: Bulent Aliev <atlasyts@bellsouth.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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> 
> I see several possible advantages to the dual pump setup.  Maybe I can
> turn one off for curise which would save current draw.  A spare pump
> would cost about 1/2.  Redundancy, which is always a good thing.
> Plumbing might actually be simpler since I have two radiators.  The only
> downsides I see is weight, space and check valves. I finally found the
> WP-136 on Summit. thier PN has an S on the end.  It looks like the
> current draw is 1/2 of the WP-337 if I'm to believe the mfg.
> 
> OK, I've made the decision, it will be two WP-136's.
> 
> 
> WP-136
> 
> Vendor    Meziere Enterprises, Inc.
> Product Line    Meziere Remote Electric Water Pumps
> Universal    Yes
> Pump Material    Aluminum
> Pump Finish    Black anodized
> Flow Rate @ 12 Volts (gpm)    20 GPM
> Flow Rate @ 16 Volts (gpm)    (Not Specified)
> Hose Adapter Required    Yes
> Hose Adapter Included    No
> Hose Adapter Thread Size    -12 AN
> Inlet Hose Size    (Not Specified)
> Inlet Hose Attachment    (Not Specified)
> Overall Depth (in)    (Not Specified)
> Amperage Drawn    5
> Weight (lbs)    (Not Specified)
> Quantity    Sold individually.
> 
> 
> Bob White


Hi Bob, somehow these numbers do not pass the "smell test". There is no way
you can pump 20 GPM with the back pressure in the system on 5 Amps alone.
Larry's observations below make sense. A little air blower motor moving air
uses 5 Amps.
Bulent 


> >  > Larry Hendrix wrote:
> >>
> >>  Keep in mind that the equivalence between horsepower and watts
> >>is746 watts per horsepower.  If a mechanical drive pump in a
> >>particular application requires 3 horsepower to produce the flow at
> >>the  system pressure drop, then the electric power will be 3
> >>horsepower, and the current 746*3/12=186 amps (not considering
> >>drive efficiencies).  As they say, there's no such thing as free
> >>lunch.
> >>
> >>  Larry