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Old 02-22-2014, 01:32 AM
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RhettMan RhettMan is offline
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stumped, these pieces dont seem to fit?

someone please explain this

i dont see the relationship in a certain equation, by that i mean, i dont see how anything is proven/solved by the use of the equation. Well, of course it claims to calculate the output of a herb/pest. spray rig's output by Gallons per acre

....i dont know why i like the irrigation forum for the question.....
anyway:

Gallons per Acre

GPA = (5940 x GPM) / (MPH x width) *

The text version of the equation is below:

(Insert: After having calculated the MPH traveling speed of Machine/Tractor while in-use, spraying)

It Reads:
"Simply incorporate the output of a single nozzle in gallons per minute (GPM) and multiply by 5,940. Then divide by the product of miles per hour (MPH) times the distance between nozzles in inches (width) on the spray boom.*
*where
width: distance between nozzles in inches, not the width of the boom.
GPM:the average output of each nozzle in tenths of a gallon, not ounces.

I did a google search on the number 5940, and found in in other online sprayer related formulas, and found it referred to simply as a "constant"

But a "constant" arrived at, how? What unit of measurement has 5940 units?

Thanks


P.S. As a side/second question, Are there 5280 feet in a mile by any chance?
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Old 02-22-2014, 02:01 AM
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1idejim 1idejim is online now
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Sent you a link that explains your question.
Posted via Mobile Device

Ever use superglue to close a bad cut?
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Old 02-22-2014, 02:51 AM
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RhettMan RhettMan is offline
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Quote:
Originally Posted by 1idejim View Post
Sent you a link that explains your question.
Posted via Mobile Device

Ever use superglue to close a bad cut?
no sir, my skin is too tough, it doesnt divide.

why?

Last edited by RhettMan; 02-22-2014 at 02:55 AM. Reason: Thanks for the link, but i will better understand the orgin of the number 5940 from an simplified explaination from you Jim.
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Old 02-22-2014, 03:01 AM
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RhettMan RhettMan is offline
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wow, look at this

http://www.lawnsite.com/archive/index.php/t-268304.html
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  #5  
Old 02-22-2014, 03:16 AM
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RhettMan RhettMan is offline
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i may have found it....pending

Last edited by RhettMan; 02-22-2014 at 03:20 AM. Reason: to erase my stupidity :)
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  #6  
Old 02-22-2014, 03:40 AM
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RhettMan RhettMan is offline
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nope, it still appears to me that all answers attempted at proving anything, so far, do not obey the "rules" of mathematics.

dont get me wrong, im not trying to disprove this forumla, (or perhaps more correctly its use of the "number?" 5940.
im looking for a way too prove it, being unable too.

and the only way to prove that

would be to point out the incorrection in each proposed solution,
and that doesnt seem like it would win one any sort of desireable prize nor favor.

ULTIMATELY, it seems there isnt much concern whether or not the formula is true, though one ought happily play along for the test score.....I suppose I will.....Certainly not arguing with a regulatory agency.

*

*all this knowing its very likely i will be corrected and feel dumb tomorrow
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  #7  
Old 02-22-2014, 10:15 AM
Kiril Kiril is offline
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Quote:
Originally Posted by RhettMan View Post
But a "constant" arrived at, how? What unit of measurement has 5940 units?

Thanks
Rhett, it is a conversion constant, no different than any other conversion constant. It is used to convert from one set of units to another set of units.

The typical form of the 5940 method equation is used to determine nozzle flow rate.

GPM = (GPA * MPH * W) / 5940

If you want to see where the constant came from then work the units. Here are some numbers to get you started

1 acre = 43560 ft^2
1 acre-foot = 325851.431889 gal
1 MPH = 88 ft/min
1 mile = 5280 ft
1 in = 0.083 ft
1 min = 0.0166666666666667 hours

Otherwise, trust the constant to do what it is supposed to .... save you time and reduce potential calculation errors.
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Old 02-22-2014, 10:41 AM
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kind of the same deal as when a calculation formula for sprinkler head precipitation rates contains the mulitplier 96.3
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Old 02-22-2014, 10:47 AM
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1idejim 1idejim is online now
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Quote:
Originally Posted by Wet_Boots View Post
kind of the same deal as when a calculation formula for sprinkler head precipitation rates contains the mulitplier 96.3


It's obvious why 9.63 was chosen Boots
Posted via Mobile Device
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Old 02-22-2014, 10:55 AM
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the precip-rate formula predates the common calculator, so there
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