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Date: Mon, 14 Mar 2005 21:29:50 -0700
From: Bob White <bob@bob-white.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: Electric water pump flow testing
Message-Id: <20050314212950.5cf46c1b.bob@bob-white.com>
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Thanks Rusty,

Keep doing whatever it takes to get one of your planes flying. :)  I'll
be looking at some fiberglass work myself when I figure out how I'm
going to cut up my cowling.  

I looked around on the link you supplied for the NPG+, and found that
comparing 10C to 80C viscosity numbers, water has a ratio of about 3,
50/50 EG/W is 5 and NPG+ is 16.  Also the viscosity of NPG+  at 80C is
about 10X that of water at 80C.

Now the interesting thing is that the viscosity of water at 10C is
about the same as 50/50 EG/W at 80C, so I should be able to get a
comparison without heating. I can use 10C water to simulate 50/50 EG/W
at 80C.

It appears that you can drink as much of it as you like (if you're a
rat).  Say is NPG+ green or is that just Prestone?  Perfect drink for
St. Pat's. 

Quote from NPG+ site:
NPG+ Coolant has been determined to be non-toxic in mammalian testing.
Independent tests on laboratory rats exposed to Evans NPG+ Coolant
showed no ill effects. 

Bob W. 


On Mon, 14 Mar 2005 20:31:00 -0600
"Russell Duffy" <13brv3@bellsouth.net> wrote:

> BTW Rusty,  did you get your flow meter, and have you made any progress on
> doing the hot water flow test?  That's going to determine whether I stick
> with the two WP136's or go with a single WP336.
> 
> Bob W.
> 
>  
> Hi Bob,
>  
> Yes, I got the latest flow meter, and it looks great, but I've been so busy
> with this &@%*# cowl that I haven't even had a chance to think about
> checking the flow.  I'm also still fiddling with the basic cooling system.
> For some reason, I'm not feeling the love from this 0 psi cap that I got
> from Evan's.  It just doesn't seem to push out, and suck in water as it
> should.  Lot's of testing to do. 
>  
> Also, be aware that I'm running Evan's NPG-R coolant, so my flow numbers
> will be different from normal water/glycol.  
>  
> Realistically, it's probably going to be a few weeks before I would get
> around to doing this, but if you're desperate for the numbers, I'll try to
> speed that up (any excuse to avoid fiberglass). Just let me know what you
> need.
>  
> Rusty (covered in green foam for the next few days, in honor of St.
> Patrick's Day)
>   
>  


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