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<p>Steve:</p>
<p>I remember all that and had to work with it in hydrology and flow
calculations for the last 40 years. However for the last 10 I
have had a computer program available that does all that stuff and
all I have to do is plug in some numbers. Back when I was
approving plans for new construction, I could look at an
applications, the spillway size and the location and ddo it in my
head....<br>
Cecil<br>
</p>
<div class="moz-cite-prefix">On 6/18/2021 4:55 AM, Stephen Offiler
wrote:<br>
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cite="mid:CAP6upcgd8sJiNZFBZAv7D-64+su82KVQM1CiqAQNLbvzS=pgYA@mail.gmail.com">
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<div dir="ltr">I haven't done flow calculations in a long, long
time, and Fluids was not among my favorite subjects back in
school... so with that said, my gut feeling is that Mark's 56%
blockage is probably somewhere in the right ballpark but
dependent on factors like whether the airflow is laminar or
turbulent, maybe Reynold's numbers.... now I'm just spewing
stuff I learned 40 years ago. Mostly to say, there might not
*be* a good way to calculate this outside of a lab with a flow
bench; really, the thing to do is try it, and take
measurements. No idea if you can see high-side pressure while
on the road but I doubt it. Any readouts for coolant or trans
temperatures?
<div><br>
</div>
<div>SO</div>
<div><br>
</div>
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<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Fri, Jun 18, 2021 at 1:03
AM magreer67 <<a href="mailto:magreer67@gmail.com"
moz-do-not-send="true">magreer67@gmail.com</a>> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div dir="auto">
<div dir="auto">Wouldn't that be 56% blockage and 44% open
to flow through?</div>
<div dir="auto">Mark Greer</div>
<div dir="auto"><br>
</div>
<div dir="auto"><br>
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<div dir="auto"><br>
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<div id="gmail-m_-202123088828031218composer_signature"
dir="auto">
<div style="font-size:85%;color:rgb(87,87,87)" dir="auto">Sent
from my Verizon, Samsung Galaxy smartphone</div>
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<div dir="auto" style="font-size:100%;color:rgb(0,0,0)"
align="left">
<div>-------- Original message --------</div>
<div>From: Cecil Bearden <<a
href="mailto:crbearden@copper.net" target="_blank"
moz-do-not-send="true">crbearden@copper.net</a>> </div>
<div>Date: 6/17/21 11:34 PM (GMT-05:00) </div>
<div>To: <a href="mailto:at@lists.antique-tractor.com"
target="_blank" moz-do-not-send="true">at@lists.antique-tractor.com</a>
</div>
<div>Subject: Re: [AT] Airflow calculations of perforated
metal for radiator screens </div>
<div><br>
</div>
</div>
<p>The .188 diameter staggered pattern gives .444 sqin hole
area over a 1 sq in area. So I guess it would result in a
44% blockage. However it would be tabout 5 inches from
the grille and then the A/C condensor sets about 6 inches
back from that. I think there would be sufficient room to
pull air from above and below. It just may cause some
additional drag at high speeds. I think I will try it and
make it easy to remove in case it blocks too much
airflow. I have to do something. Time and ability to
work on this stuff gets more valuable daily...<br>
Cecil<br>
</p>
<div>On 6/17/2021 7:48 PM, Brad Loomis wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">The 455 diesel lawn tractor I use at work
has a pull out screen ahead of the radiator. I'm not
there so I can't measure it. But I will try tomorrow and
report back. It does keep the foxtails, thistle,
mustard, and whatever else I kick up out of the
radiator.
<div>Brad</div>
</div>
<br>
<div class="gmail_quote">
<div class="gmail_attr" dir="ltr">On Thu, Jun 17, 2021
at 5:23 PM Cecil Bearden <<a
href="mailto:crbearden@copper.net" target="_blank"
moz-do-not-send="true">crbearden@copper.net</a>>
wrote:<br>
</div>
<blockquote style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex" class="gmail_quote">I
had to wash the A/C condensor and radiator out on my
2011 Chevy truck <br>
yesterday before I could make a trip to pick up some
auction items. I <br>
put the gauges on my a/c system and it showed 35 low
and 350 high. <br>
before I did anything I went to the water hose and got
it down to 150 <br>
pretty quickly on the high side. The amount of bugs
was crazy. I will <br>
have to remove the radiator and condensor to get them
clean as there is <br>
no room to get anything in the front or behind the
fan. I have one of <br>
those heavy cowcatcher style grill guards in the
front. This truck has <br>
about 170K miles and has made 3 trips to Alaska, so it
may have more <br>
bugs than usual, but the bugs and thi8stle seeds are
terrible here and <br>
getting worse. I want to put a piece of perforated
metal behind the <br>
grill guard to catch the bugs. If it cuts the air
down, it can still <br>
come in between the screening and the grill. I don't
think it will make <br>
a lot of difference in the amount of air entering the
radiator, but <br>
maybe catch the bugs and fluffy crap in the air...
When we figure <br>
airflow into a home, we cut the flow through a window
in half when a <br>
screen is used. I am looking at a peforated metal
with holes .188in <br>
in diameter and offset centers so it gets the most
holes per square <br>
inch. Does anyone have any experience with this type
of screening or <br>
have a formula to determine if it will cut the airflow
too much. I think <br>
the area behind the grill guard and the grill is wide
enough to keep <br>
from cutting down the air flow. Traveling down the
road at 60mph it may <br>
deflect some air around the grill instead of through..<br>
<br>
I just don't want to have to remove this radiator
again. I have to use <br>
a stepladder to work on the d&%$^d thing it is so
tall. It is stock for <br>
that year, but the manufacturers want to see how far
the drivers can <br>
jump to get into a pickup nowdays. I remember a 63
and 66 chevy 1/2 ton <br>
pickup we worked out of on the farm every day. Hauled
20 head of cows <br>
in a bumper trailer with no brakes into OKC
Stockyards. Loaded 60 <br>
bushels of wheat to haul to the elevator when the
lines were long and <br>
the grain truck had not returned. Now, I have a 3/4
ton that I have to <br>
jump into or pull myself in with the steering wheel
and 30 bushels of <br>
rye in the bed causes it to squat, with twice as much
tire under it than <br>
the old ones had.. It doesn't ride all that much
better, just cooler <br>
when the A/C works. OK rant off.....<br>
<br>
Cecil<br>
<br>
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