[AT] Airflow calculations of perforated metal for radiator screens

[Cecil Bearden]

Mark you are so correct.  I transposed my thinking.....
Cecil


On 6/17/2021 11:24 PM, magreer67 wrote:
> Wouldn't that be 56% blockage and 44% open to flow through?
> Mark Greer
>
>
>
> Sent from my Verizon, Samsung Galaxy smartphone
>
>
> -------- Original message --------
> From: Cecil Bearden <crbearden at copper.net>
> Date: 6/17/21 11:34 PM (GMT-05:00)
> To: at at lists.antique-tractor.com
> Subject: Re: [AT] Airflow calculations of perforated metal for 
> radiator screens
>
> 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
>>
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