From: "Marko Bewersdorff" <marko@bewersdorff.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: RE: [FlyRotary] EWP - Response from DaviesCraig
Date: Sat, 11 Oct 2003 21:16:13 -0700
Message-ID: <HKEGKAHKFINFFEKPHLNAMEOFEAAA.marko@bewersdorff.com>
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Nicely put wording for "I'm gonna fly with your product and it is really
inportant" ;-)

What was the price for one or two of them? can we get a group discount :-)

thanks for the info below.

re

Marko

> -----Original Message-----
> From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On
> Behalf Of Robinson, Chad
> Sent: Saturday, October 11, 2003 7:19 PM
> To: Rotary motors in aircraft
> Subject: [FlyRotary] EWP - Response from DaviesCraig
>
>
> Hello all,
>
> DaviesCraig responded to my inquiry today, saying that there is
> hardly any resistance to flow while the pump is off, and that a
> series setup is a solution they think will work well. Their exact
> response is below, but what it basically means is that no valves
> and plumbing complications are required - just pass the flow from
> one to the other, and you can run either pump, or both.
>
> This device is looking better every day!
>
> Oh, and yes, the all-caps was their idea, not mine. =)
>
> Regards,
> Chad
>
> ---------------------------------------------------------
>
> DEAR CHAD,
>
> Thanks for your email and Davies, Craig EWP enquiry.
>
> ----- Original Message -----
> From: "Robinson, Chad" <crobinson@rfgonline.com>
> To: <dcfans@daviescraig.com.au>
> Sent: Sunday, October 12, 2003 12:53 AM
> Subject: EWP - backflow?
>
>
> Some fellows and I are discussing the use of this pump in an area where
> redundancy is preferable. I can't seem to find information on your site
> regarding backflow in the event the pump is not operating. That is, what
> resistance to flow exists if the pump is off?     HARDLY ANY ESPECIALLY IN
> COMPARISON TO THE RESISTANCE TO FLOW OF A RADIATOR TUBE. IF YOU HAVE A EWP
> YOU CAN LOOK INTO THE  INLET AND SEE THE SIZE OF THE OPENING PAST THE
> IMPELLER AND INTO THE OUTLET.
>
> If it is low, we would need a check valve, but if it is high we might get
> away without one. Also, if it is VERY low, we might put the pumps
> in series.
> PUMPS IN SERIES SOUNDS LIKE THE ANSWER
>
> In this second case, the goal would be to provide additional flow during
> times that require high cooling, or if the first pump fails. How does this
> pump handle flow above its design limit?  NO TROUBLE - WE HAE MANY EWPs
> INSTALLED AS A BOOSTER TO THE ORIGINAL BELT DRIVE MECHANICAL PUMP
> . HERE IS
> OUR TECHNICAL BULLETIN ON THIS SUBJECT.
>
>
> EWP TECHNICAL BULLETINS
>
> EWP AS A BOOSTER PUMP
>
> What a lot of our customers in your situation have done with great success
> is add the EWP (part no 8005) into the lower radiator hose, wired
> direct to
> the battery via an on/off thermal switch (part no 0401) and use
> the EWP as a
> booster pump.
>
> Both the existing belt driven mechanical pump and the EWP will
> pump through
> each other when running alone and they will boost each other when
> running at
> the same time. In fact, when running together they will pump more than the
> sum of the two, pumping alone.
>
> You set the temp switch to the temp below which you want the
> engine to run.
> If the temp goes above that set temp, the EWP will turn on and
> run until the
> engine temp is 4 degrees C cooler and switch off.
>
> When you turn off a hot engine, the heat in the exhaust manifold passes to
> the block and the engine temp actually increases after you turn off the
> engine. If the head is alloy and the block iron, they will expand at
> different rates and the head will tend to twist to accommodate the
> difference, then the head gasket will be damaged.
>
> Being wired direct to the battery, when you turn off a hot engine, the EWP
> will run and wash out heat soak until the engine temp reaches the set temp
> less 4c.  After the EWP turns off, the heat may still transfer and the EWP
> will turn on for another short period. The EWP may run for about 4 minutes
> all up and at 6 amps there will be very little drain on the battery.
>
>  This will eliminate heat soak and the engine damage associated with it.
>
>
> MOUNT THE EWP IN THE LOWER RADIATOR HOSE IS BEST
>
>
>  Does it provide impetus, or will it cap off at a certain limit (or worse,
> overspeed?). That could make putting them in series a bad idea.  I AM NOT
> SURE JUST EXACTLY WHAT YOUR APPLICATION IS SO IT IS DIFFICULT FOR ME TO
> COMMENT ON THIS.
>
>
> Regards,
>
> Richard Davies
> Managing Director
> Davies, Craig Pty. Ltd.
>
> PLEASE NOTE : WE HAVE MOVED TO
>
> 77 TARAS AVENUE, BOX 363
> ALTONA NORTH, VICTORIA , 3025
> AUSTRALIA
>
> TEL: +61 (0) 3 9369 1234   FAX 9369 3456
>
> WEB page  www.daviescraig.com.au
>
> >>  Homepage:  http://www.flyrotary.com/
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