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If you calculate the actual work required to pump the water, it is much less
than 3 HP, theoretically only about 0.3 horsepower. An Electric water pump
can do that. There are two things that get people all bolloxed up.
1. a mechanically driven pump is going to suck more power as you speed it
up, whether it can pump any more water or not. This is what the E-pump
manufacturers use to say you get all kinds of horsepower savings.
2. The other thing that needs to be looked at is how much power the folks
that are using E-pumps are actually generating. they may be between 100-150
horsepower.
I don't advocate a 10F drop across the rads, will result in too high a flow
needed. Take a bigger drop and lower the flow.
Bill Schertz
KIS Cruiser # 4045
----- Original Message ----- From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Thursday, November 04, 2004 7:36 PM
Subject: [FlyRotary] Re: FW: Error in presentation calculations
> Hang on George there is a lot more on this as soon as Bill sends me the
> complete pdf on the whole paper. The stock water pump pumps up to 50 gal
per
> minute
> as I recall and consumes 3 HP. If you are thinking of an electric pump
> that would be 172 amps at 13 volts at 100% efficiency. If the electric
motor
> was 80% efficient that would be 215 amps!
>
> Paul Lamar
>
> The Rotary Engine NewsLetter. Powered by Linux.
> ACRE NL web site. http://home.earthlink.net/~rotaryeng/
> Copyright 1998-2004 All world wide rights reserved.
>
> ------ End of Forwarded Message
Well, again - here is clear proof (above) that you folks flying
sucessfully
with Electric water pumps ( drawing magnitude of power less) simply can
not
be doing so {:>).!
But, the good news is there has been progress, it used to take 16 HP to
drive the mechanical water pump and now it only takes 3 HP. So should
progress continue at this rate, I would estimate that the HP requirement
for
water pumps should drop to within the practical range of electric water
pumps within this decade. So if you can hold off on your outlandish and
simply improbably claims to have flow sucessfully with an electrical water
pump until say 2010 then it should be OK.(tongue in cheek of course).
Ed Anderson
> >> 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
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