[AT] Airflow calculations of perforated metal for radiator screens

[Cecil Bearden]

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...
Cecil

On 6/17/2021 7:48 PM, Brad Loomis wrote:
> 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.
> Brad
>
> On Thu, Jun 17, 2021 at 5:23 PM Cecil Bearden <crbearden at copper.net 
> <mailto:crbearden at copper.net>> wrote:
>
>     I had to wash the A/C condensor and radiator out on my 2011 Chevy
>     truck
>     yesterday before I could make a trip to pick up some auction
>     items.   I
>     put the gauges on my a/c system and it showed 35 low and 350 high.
>     before I did anything I went to the water hose and got it down to 150
>     pretty quickly on the high side.  The amount of bugs was crazy.  I
>     will
>     have to remove the radiator and condensor to get them clean as
>     there is
>     no room to get anything in the front or behind the fan.   I have
>     one of
>     those heavy cowcatcher style grill guards in the front.  This
>     truck has
>     about 170K miles and has made 3 trips to Alaska, so it may have more
>     bugs than usual, but the bugs and thi8stle seeds are terrible here
>     and
>     getting worse.  I want to put a piece of perforated metal behind the
>     grill guard to catch the bugs. If it cuts the air down, it can still
>     come in between the screening and the grill.  I don't think it
>     will make
>     a lot of difference in the amount of air entering the radiator, but
>     maybe catch the bugs and fluffy crap in the air...     When we figure
>     airflow into a home, we cut the flow through a window in half when a
>     screen is used.    I am looking at a peforated metal with holes
>     .188in
>     in diameter and offset centers so it gets the most holes per square
>     inch.   Does anyone have any experience with this type of
>     screening or
>     have a formula to determine if it will cut the airflow too much. I
>     think
>     the area behind the grill guard and the grill is wide enough to keep
>     from cutting down the air flow.  Traveling down the road at 60mph
>     it may
>     deflect some air around the grill instead of through..
>
>     I just don't want to have to remove this radiator again.  I have
>     to use
>     a stepladder to work on the d&%$^d thing it is so tall. It is
>     stock for
>     that year, but the manufacturers want to see how far the drivers can
>     jump to get into a pickup nowdays.  I remember a 63 and 66 chevy
>     1/2 ton
>     pickup we worked out of on the farm every day.  Hauled 20 head of
>     cows
>     in a bumper  trailer with no brakes into OKC Stockyards. Loaded 60
>     bushels of wheat to haul to the elevator when the lines were long and
>     the grain truck had not returned.  Now, I have a 3/4 ton that I
>     have to
>     jump into or pull myself in with the steering wheel and 30 bushels of
>     rye in the bed causes it to squat, with twice as much tire under
>     it than
>     the old ones had..   It doesn't ride all that much better, just
>     cooler
>     when the A/C works.   OK  rant off.....
>
>     Cecil
>
>     _______________________________________________
>     AT mailing list
>     AT at lists.antique-tractor.com <mailto:AT at lists.antique-tractor.com>
>     http://lists.antique-tractor.com/listinfo.cgi/at-antique-tractor.com
>
>
> _______________________________________________
> AT mailing list
> AT at lists.antique-tractor.com
> http://lists.antique-tractor.com/listinfo.cgi/at-antique-tractor.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.antique-tractor.com/pipermail/at-antique-tractor.com/attachments/20210617/19011fe7/attachment.htm>