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From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-400802@logan.com>
Subject: Re: [FlyRotary] Re: Photos of Core tanks internals
Date: Tue, 7 Sep 2004 13:53:38 -0400
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Joe, I didn't measure the thickness, but as best I recall it was 3 3/8" -3
1/2" thick.  I'll measure it next time down to the shop.
Rainfall rate here was just reported as 1" /hour, so not a deluge but pretty
heavy rain.

Ed

Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message ----- 
From: "Joseph M Berki" <Joseph.M.Berki@grc.nasa.gov>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, September 07, 2004 1:26 PM
Subject: [FlyRotary] Re: Photos of Core tanks internals


> Ed,
>          Is the core pictured 3.75" thick? Thanks
>
> Joe Berki
> Limo EZ
>
> At 12:38 PM 9/7/2004 -0400, you (Ed Anderson) wrote:
> >Well, David,  I just went down to the shop through the pouring remnants
of
> >Frances and cut open each side tank of a core I had taken from the
junkyard
> >years ago.
> >
> >The photos are attached and speak for themselves - no dividers or other
> >impediments to coolant flow in the tanks - pretty clean channel from top
to
> >bottom.  Each "row" has 5 approx 1/8" (perhaps slightly larger) dia holes
> >that conduct the water through the core to the opposite side tank.  So 14
> >rows * 5 * area of 1/8-3/16" dia hole would give a cross flow channel
area
> >of around 0.86 sq inches to 1.93 sq inches - probably toward the larger
> >figure.
> >
> >So as Bill suggested they may have redesigned the heat exchangers to take
a
> >different approach to recondensing the refrigerant calling for the
divider
> >plate.  Given the relatively small cross channels, it is my opinion that
a
> >serpentine cooler is probably offering considerably more resistance to
flow.
> >Some of the radiator shop webpages give an estimate of the increase in
flow
> >resistance of a Serpentine core over the straight through - as best I
recall
> >it was something like 4 times as best I recall.
> >
> >So, its clear that not all GM evaporator cores are created the same way.
> >This one was from the an late 80s early 90s Cadillac.  I looked all over
for
> >some identifying model number but could not find anything.  I do recall
it
> >had a yellow sticker with a black C on it when I yanked it.
> >
> >In any case, it looks like we can not simply order just any GM cooler
core.
> >I suspect that when they switched over to the more environmental friendly
> >refrigerant then  there could have been some redesign of the core, but
just
> >speculation on my part.
> >
> >Here's the photos
> >
> >Ed.
> >
> >
> >Ed Anderson
> >RV-6A N494BW Rotary Powered
> >Matthews, NC
> >----- Original Message -----
> >From: "David Carter" <dcarter@datarecall.net>
> >To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> >Sent: Tuesday, September 07, 2004 11:55 AM
> >Subject: [FlyRotary] Re: Water pump problem
> >
> >
> > > Thanks, Ed.
> > >
> > > I wonder Steve Brooks's core with a "plate" is different from the
> > > GM/Harrison cores that I have (Chev'y Caprice).
> > >     - When I probed my core last night and found no plates in the end
cap
> > > with the larger of the two welded tubes, I DIDN'T check the other
side -
> > > those smaller 1/2" OD tubes turn 90 degrees and run about a foot, so I
> >never
> > > probed that side.  That is the side that has the little "filter"
and/or
> > > "expansion jet" thing sitting about an inch down inside.  Perhaps
there's
> >a
> > > plate on that side that matches what has been discussed recently.
> > >
> > > If Steve's core is a typical GM/Harrison core, then I'd like to
understand
> > > more about which end "the plate" is in and tell us more about "the
tube
> >that
> > > was removed".  I've not yet cut into any of my cores to mod the
fittings,
> >so
> > > am ignorant of the insides.
> > >
> > > David
> > >
> > > ----- Original Message -----
> > > From: "Ed Anderson" <eanderson@carolina.rr.com>
> > > To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> > > Sent: Tuesday, September 07, 2004 6:54 AM
> > > Subject: [FlyRotary] Re: Water pump problem
> > >
> > >
> > > > Hey, David, not to worry.  We have all hit the "Send" button on an e
> >mail
> > > or
> > > > two and later wondered why we did. {:>)
> > > >
> > > > Ed
> > > >
> > > > Ed Anderson
> > > > RV-6A N494BW Rotary Powered
> > > > Matthews, NC
> > >
> > >
> > >
> > > >>  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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