From: "Marko Bewersdorff" <marko@bewersdorff.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: RE: [FlyRotary] Re: Electric Water Pumps and Heat Rejection
Date: Thu, 2 Oct 2003 22:18:30 -0700
Message-ID: <HKEGKAHKFINFFEKPHLNACEFPDPAA.marko@bewersdorff.com>
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I concur - sorta, I tried to run a little vacuum pump with an electric motor
and burnt my finger on that wire I hooked up to it. Not scientifically
speaking it used a lot of power pumping nothing (3 inch of quicksilver worth
of nothing that is) I think I'm going with the electric gyro btw..
I also tried to run that pump with my big drill press - that vacuum sucker
sucked a lot of amps!
I was surprised.
So since water is thicker than air I could see that a properly sized
electric motor with a high efficiency pump got to do more than 1 kW.
On the other hand someone ought to tell us how many cm^3 of water flow per
second it takes to remove the heat from a 160 HP developing 13B. Maybe a
balmy trickle through the engine does the trick anyways.
Does anyone recall how much of a trickle from the faucet a test stand engine
is using?

re

Marko


> -----Original Message-----
> From: Rotary motors in aircraft
> [mailto:flyrotary@lancaironline.net]On Behalf Of Ed Anderson
> Sent: Thursday, October 02, 2003 4:52 PM
> To: Rotary motors in aircraft
> Subject: [FlyRotary] Re: Electric Water Pumps and Heat Rejection
>
>
>
>  From: "Rino" <lacombr@nbnet.nb.ca>
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Sent: Thursday, October 02, 2003 6:53 PM
> Subject: [FlyRotary] Re: Electric Water Pumps and Heat Rejection
>
>
> > Ed Anderson wrote:
> >
> >  That analysis was based on the fact that the Mazda water pump
> > > supposedly consumed 13-16 HP at 6000 rpm.
> > >
> > > Ed Anderson
> >
> > A half inch V belt will NOT transmit 13-16 HP for very long!  I do not
> > think that is a realistic value.
> >
> > Rino
>
> I presume you are correct, Rino.  The Mazda water pump is driven
> by two "V"
> belts on the older engines which would up the capability a bit.  But, the
> main point is - how much power does it really take to flow enough
> coolant to
> keep the rotary engine happy at 6000 rpm rather than how much power might
> the pump be consuming.
>
> I don't know the answer, but I agree 16 HP seems a bit on the
> high side.  My
> point was that if you base analysis on erroneous data or assumptions, then
> it would seem to follow that the answer you get is liable to be erroneous
> {:>)  Hopefully, Todd will get his bird back into the air with an
> EWP and we
> will have real world data/evidence.
>
> Ed Anderson
>
>
>
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