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From: "Jack Ford" <jackoford@theofficenet.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-763329@logan.com>
Subject: Re: [FlyRotary] Re: [FlyRotary]Belt rumnations; soliciting Opinions of racers please....
Date: Mon, 28 Feb 2005 13:17:34 -0800
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How about timing the interval between filling and emtying two 55 gal. drums?

Suck it out of one, pump it into the orher through the engine.

----- Original Message ----- 
From: "Jim Sower" <canarder@frontiernet.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Monday, February 28, 2005 12:42 PM
Subject: [FlyRotary] Re: [FlyRotary]Belt rumnations; soliciting Opinions of
racers please....


> <... My guess is that the EWP will ONLY work if the water flow path is
> cleaned up sufficiently to allow it to work ...>
> My guess is that we're pretty much clueless.  In a closed system, the
> only impediment to flow is friction which is largely a function of flow
> rate and some exponential function of the diameter of the "pipe".  The
> irregularities in our system are such that they render any attempt to
> compute total friction an exercise in mental masturbation.   What we
> need is some expire mental measurement of flow rate under actual
> conditions (which will involve a flow meter in the system) and then,
> with the engine at rest (the pump is the only moving part in the
> system), we can see how much current it takes to achieve that flow rate.
> Sadly, the pivotal instrument, a flow meter that doesn't disturb the
> system too much, is probably not available.  If someone could come up
> with a flow meter in a 1.25" line, we could do some expirements.
> Other than that, we're guessing at numbers like PL and the bumblebee
> folks ... Jim S.
>
>
> Ernest Christley wrote:
>
> > Paul wrote:
> >
> >> I have a small 12 volt bilge pump for my birdbath/fountain. Mfr
> >> claims it moves 640 gph of water.  If I divide gallons per hour by
> >> 60= gpm should work out to around 10.66 gpm. This is a tiny 12 volt
> >> bilge pump that my photovoltaic cell runs, with no battery. (only
> >> works when the sun is overhead). You can hold it in the palm of your
> >> hand nearly close your hand around it.  Seems like it wouldn't take
> >> much larger of a motor to push 30 gpm if this puny thing will pump
> >> 10+ gpm.  It will empty a bilge pretty fast. I realize this is
> >> unrestricted water, but still, it has to move all that water out of a
> >> boat bilge, and does a fine job. It pumps the water in my fountain
> >> too high, had to put a restrictor on it.  Paul Conner
> >
> >
> >
> > Paul, I think one of the factors often left out of the EWP/EDWP
> > discussion is head pressure.  GPH or GPM is meaningless without
> > stating what head it is pushing against.  I'm trying to remember this
> > off the top of my head, but I compared the water flow and current
> > measurments that Todd gave a while back with a chart that Davies-Craig
> > provided which showed flow vs current draw for various head
> > pressures.  I estimated then that Todd's system had about 9psi of head
> > pressure.  Most of the flow calculations I've seen arguing that the
> > EWP won't work use a figure of 30psi of head.  The two ain't the same
> > thing.
> >
> > My guess is that the EWP will ONLY work if the water flow path is
> > cleaned up sufficiently to allow it to work.  I think Rusty's
> > experiment with using both has a high likelyhood of failure, because
> > he will be using the EWP with the thermostat and the tortured path
> > that the EDWP forces the water through.  It will be overwhelmingly
> > convincing if does work with the odds stacked against it so much, but
> > at most will only be a qualified failure.
> >
> >>>  Homepage:  http://www.flyrotary.com/
> >>>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
> >>
> >
> >
>
> >>  Homepage:  http://www.flyrotary.com/
> >>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
>