Guy,
The sheep story was to lighten up. Don't worry about it. Crash has already
convinced me that the fan in front is no more of an impedance to the air
passing through it than the fan behind. The sheep story brings an added
dimension which is not to do with air flow through it so much as air
deflection around it. The walls deflect the wind off the sheep.
A good design of fan will have only a minimum amount of deflection anyway,
but that minimum amount will spill around the edges of the fan / motor /
frame. In front of the rad this deflected air may or may not then go
through the rad core. The air spilled around the fan behind has already
passed through the rad core and done its work.
Guy
----- Original Message -----
From "Guy R Day" <grday at btinternet.com>
To: "Guy Weller" <Guy.Weller@kencomp.net>; "David Ramsey"
<dwramsey@worldnet.att.net>; "'Robert E. Shlafer'" <PilotRob@webtv.net>
Cc: <spridgets@autox.team.net>
Sent: Monday, April 26, 2004 9:35 AM
Subject: RE: FW: The Heater as Cooler - longish bit without LBC content
> The inherited knowledge of sheep leads them to become mutton.
>
> Time to stick another oar in and perhaps take this debate back to where it
> belongs. If I place an open ended barrel on the roof of a car to
transport
> it; am I better placing the flat closed end forwards or the open end?
Which
> way round will cause less drag? (And why?)
>
> Guy R Day
>
>
>
>
> -----Original Message-----
> From: owner-spridgets@autox.team.net
> [mailto:owner-spridgets@autox.team.net]On Behalf Of Guy Weller
> Sent: 26 April 2004 07:37
> To: David Ramsey; 'Robert E. Shlafer'
> Cc: spridgets@autox.team.net
> Subject: Re: FW: The Heater as Cooler - longish bit without LBC content
>
>
> Crash,
> I live in the English Lake District. We have sheep here that have been
bred
> on the fells for generations. They are called "hefted" flocks. This means
> that the sheep have learn't their way around the open fells and this
> knowledge is passed on from one generation to the next. If other sheep
are
> brought in and grazed on the fells they die from exposure in bad weather
> because they don't know where to shelter from the rain and snow.
> The hefted sheep shelter on the leeward side of walls and rock outcrops -
> not on the upwind side. They know that an obstruction in the airflow on
> the upwind side of them reduces the windspeed and they survive. The
hefted
> sheep do not drive Spridgets of course, but they do seem to know what they
> are talking about.
>
> Guy
>
> ----- Original Message -----
> From: "David Ramsey" <dwramsey@worldnet.att.net>
> To: "'Robert E. Shlafer'" <PilotRob@webtv.net>
> Cc: <spridgets@autox.team.net>
> Sent: Monday, April 26, 2004 5:20 AM
> Subject: RE: FW: The Heater as Cooler - longish
>
>
> > Bob, My point was that, that motor/fan/shrouding will "block" the air
> > flow in the back as well as the front. Do you think the air flow ends
> > at the rear of the radiator? The air has to come from and go to
> > someplace. You might be able to measure a difference from the
> > restriction being in the front or back of the radiator in a lab, but it
> > would be very small if any, and a result of the factors I stated in my
> > last post not the "restricted air flow". Fluid Mechanics teaches us
> > that in a "system" the "flow in" will be equal to the "flow out", it's
> > the law, don't make me get Sheriff John Brown after you.
> > Crash
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