Date: Fri, 10 Oct 2003 12:30:35 -0400
From: echristley@nc.rr.com
Subject: Re: [FlyRotary] Re: EWP - Success at last?
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Reply-to: echristley@nc.rr.com
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> > >    If it were 15-30 amps I would be less surprised, but 7.5 does
> surprise me.
> > >   However, that is fairly easy to measure, so I have to assume the
> current
> > > figures must be correct.
> >
> >    Part of the answer lies in the fact that once the motor is 
> spun up, it
> isn't drawing anyway near it's maximum current.  Inrush current at 
> startupmay very well be in the 15-30 amp range.
> >
> > Dale R.
> >
> >
> Aha!,  Thanks, Dale that helps!
> 

Is everyone keeping in mind that the coolant is in a closed system.  That is, in a frictionless system the only energy that would need to be added would be to get the water moving. But there is friction in the system.  The electric pump only needs to keep the water moving through the engine and radiator.  The ED pump adds in the losses through the thermostat restriction, which as I understand it is quite high.  Once the water is spinning, the EW will have an easier time of it.