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From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-2890470@logan.com>
Subject: Water Pump Location was  [FlyRotary] Re: radiator orientation?
Date: Fri, 2 May 2008 12:28:58 -0400
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Gee, Bob, try finding late night movies of "I Love Lucy" or something to put 
yourself  to sleep {:>)

Regarding location of water pump - good/bad?  Tracy Crook once had a cooling 
leak out in Texas I believe.  I forget all the details (think it was a 
broken/loose tension bolt), but in any case, he detected he was losing 
coolant.

He landed and fixed it and all was well.  However, he did observe that the 
fact the water pump sat so high on the engine would prevented it from 
pumping all the coolant out in case of a radiator or plumbing leak.

If I recall correctly, he observed  the fact that coolant fluid remained in 
the block (even if it was close to or actually boiling) and possibly 
undergoing a phase change from liquid to vapor would absorb a tremendous 
amount of heat (so long as coolant remained).  He concluded that the 
placement of the pump was therefore could be fortuitous in case of a leak 
and attributed its location at least in part to making it to a safe landing 
with no damage to the engine.

Just thought I would throw that in the hat for you to think about tonight 
{:>)

Ed
Ed Anderson
Rv-6A N494BW Rotary Powered
Matthews, NC
eanderson@carolina.rr.com
http://www.andersonee.com
http://members.cox.net/rogersda/rotary/configs.htm#N494BW
http://www.dmack.net/mazda/index.html
----- Original Message ----- 
From: "Bob White" <bob@bob-white.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Friday, May 02, 2008 12:03 PM
Subject: [FlyRotary] Re: radiator orientation?


> On Thu, 1 May 2008 20:14:48 EDT
> Lehanover@aol.com wrote:
>
>>
>> In a message dated 5/1/2008 3:31:46 PM Pacific Daylight Time, 
>> silvius@gwi.net
>> writes:
>>
>> Anyone see any issues of concern with installing the radiators in the
>> vertical orientation as opposed to their normal orientation with the 
>> inlets
>> and outlet on the top. These are evaporator cores from a JMC Jimmy- Chevy
>> Blazer
>>
>> Michael in Maine
>>
>> Make at least one outlet at the top. Inlet at the bottom.
>>
>> Lynn E. Hanover
>>
>>
>>
> Hi Lynn,
>
> I had to sleep on that advice to get it straight in my head.  I believe
> it's good advice, but could still be connected in a detrimental way.
> It's important to feed the water pump from the bottom of one of the
> coolers.  If the coolers are in series, the outlet and inlet would both
> be on the bottom with a straight connection between the top fittings
> connected together.  That would simplify the plumbing as well as insure
> that in the event of a cooling leak, the second core would remain full
> of water at least until the first core was nearly empty.  Using the top
> fittings for outlet and inlet would still make one of them flow bottom
> to top, but would be detrimental if there were a loss of fluid.
>
> With the cores in parallel, I'm not so sure bottom to top flow for one
> of them would be a good idea.  It would complicate the plumbing, and
> make it more likely that flow rates would be unequal between the
> cores.  But if one did connect them that way, it would still be
> important to make the outlet near the bottom of the radiator.
>
> I had always wondered why Mazda designed the engine with the water pump
> so near the top of the engine which results in a lack of flow with just
> a small amount of water loss.  It seemed to be a design flaw.  After
> starting to disassemble the RX-7, I now realize that the engine is
> setting so low relative to the radiator in the car that is isn't any
> more of a problem than most cars.  In general, the radiator is
> usually relatively low in the airplane installations which make the
> pump location less than ideal.
>
> Bob W. (Need something better to think about when I can't fall asleep.)
>
>
> -- 
> N93BD - Rotary Powered BD-4 - http://www.bob-white.com
> 3.8 Hours Total Time and holding
> Cables for your rotary installation - http://roblinstores.com/cables/
>
> --
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