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Date: Sat, 19 Mar 2005 12:51:14 -0500
Subject: Re: [FlyRotary] Re: Water Pump Viscosity Test
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From: Jerry Hey <jerryhey@earthlink.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
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Bob,  thanks for the explanation.  Are you going to to  use the Meziere=20=

adaptor?  Have  you already mounted it?   Will the adaptor fit the 336?=20=

  One cautionary note:  I believe it is not a good idea to feed a single=20=

radiator (I think you have  just one)  from two sources as  you will=20
almost certainly get reverse flow if they are not perfectly balanced=20
(not likely to happen).  There is a NASA  paper concerning this but I=20
have not kept the reference.   Jerry


On Saturday, March 19, 2005, at 12:31  PM, Bob White wrote:

> Hi Jerry,
>
> 20 GPM was my design goal which was set based on Bill Schertz'=20
> analysis.
> At that flow rate, it gives me room to accomodate some problems with
> heat transfer and air flow.  I think Bill's analysis give a pretty
> clear picture of what's needed.  If I go thru it and adjust for my
> system, I get:  (All of the following is based on Bill's charts and
> analysis.)
>
> 1.  Set the redline temp at 210.  That is Bruce's never exceed temp.
> 2.  For a 200 HP engine with a 50 F drop across the engine, I will =
need
>      a flow of 15 GPM and 160 F water out of the radiators.
> 3.  On a real hot day (110F), I will have a 50F potential between the
>      outside air, and the air out of the radiators.
>
> (both the air flow and temperature drop graphs stop at 50 F and the
> curves are getting flat anyway, so these are probably the best worst
> case conditions to consider.)
>
> 4.  I will need about 6500 CFM to accomplish that.
> 5.  Initially, I will make my cowl opening 144 in. sq. (two 8 X 9).
> 6.  With those openings, I can get 6500 CFM at about 90 MPH.
>
> There may be some factor I don't know about which makes it work better
> than calculated, but air flow or heat transfer problems  will=20
> definitely
> make it worse.  Anyway, the test has answered the question about
> viscosity which was really it's only purpose.  I feel a lot better not
> having to guess about it.  :)  If I had seen a significant increase in
> flow rate, I would be right at the design goal and I could have forged
> ahead.  Now I'll have to think some more.
>
> At the moment, I'm leaning toward getting the WP336 which I think will
> give me 16 GPM.  (It would be nice to test it.)  That should be an
> adequate flow per the above analysis.
>
> If it weren't for the positive experiences of guys like Todd and Leon,
> I wouldn't even be trying EWP's.  OTOH, I want to start with the =
system
> as well designed as I possibly can.  It will be a lot easier to back
> off if I have too much cooling than trying to get more.
>
> Bob W.
>
>
>
> On Sat, 19 Mar 2005 10:59:04 -0500
> Jerry Hey <jerryhey@earthlink.net> wrote:
>
>> Bob,  I appreciate the well thought out test although I am not ready=20=

>> to
>> say I understand its implications.  How much coolent flow is required
>> is related to other variables such as radiator size and air volume
>> passing through the radiator. It may  be the case that slower coolent
>> flow is preferable or at  least acceptable.   We know that the EWPs
>> will work if the other variables are optimised.  Leon=92s racing
>> experinece with EWPs and Todds ability to cool a turbo with an EWP,
>> have me thinking that we need to focus on the other components of the
>> cooling equation and not worry about the  EWP.  Jerry
>>
>>
>
>
> --=20
> http://www.bob-white.com
> N93BD - Rotary Powered BD-4 (real soon)
>
>>>  Homepage:  http://www.flyrotary.com/
>>>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
>