I have just acquired a new Rain Bird 12DSH 1/2 circle nozzle. How do I control the distance and radius of the two sprays?

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The distance is purely based on water pressure 15 PSI gets 9 feet, and 30 psi gets 12 feet. You probably have at least 30 psi so it is going to spray 12 ft. and you can't change that. The 1/2 circle nozzle is going to always spray 180 degrees, you can turn it to point where you want but you can't increase or decrease the pattern from 180 degrees. You can buy 1/4 and full circle nozzles for this sprinkler though. The last letter of the part number signifies that pattern. H=Half, F=Full, Q=Quarter so a 12DSH=half.

Posted on May 20, 2014

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Posted on Jan 02, 2017

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The adjustments can be made using the instructions in this manual from Rainbird website.

http://www.rainbird.com/documents/diy/man_sprayheads.pdf

http://www.rainbird.com/documents/diy/man_sprayheads.pdf

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Try some penetrating spray lubricant.

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Follow the instructions from the website.

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(pi)R squared (Fixya won't let me use the sign for Pi)

Area of a circle=pi*radius^2 or pi times radius times radius

example: suppose the radius of a circle is 10 inches, then the Area of the circle would be pi times 10 times 10 or 100*pi

pi represents the circumference (distance around) of a circle / diameter and for any circle is constantly the same number which is approximately 3.14

so in my example 100*pi=100*3.14 or 314 square inches

Area of a circle=pi*radius^2 or pi times radius times radius

example: suppose the radius of a circle is 10 inches, then the Area of the circle would be pi times 10 times 10 or 100*pi

pi represents the circumference (distance around) of a circle / diameter and for any circle is constantly the same number which is approximately 3.14

so in my example 100*pi=100*3.14 or 314 square inches

Jul 03, 2014 | Computers & Internet

Change the nozzle. If it is an adjustable nozzle change it to a fixed spray with the desired radius. 1/4, 1/3, 1/2, 2/3, 3/4 patterns are available.

Mar 25, 2014 | Toro 570Z Pro Series Black Pop-Up...

If it is a rotating glorified streamer nozzle designed to conserve water. Double the run time. Not sure what your watering plants or lawn. if it's a lawn 20 min should work.

Mar 20, 2014 | Rainbird Rain Bird 22SA-Q 6-Inch 17 to...

30" diameter? Radius is 15" (half of diameter).

30" circumference (distance around) is a little more complicated...

The number is the ratio of the circumference of a circle to the diameter. The value of is approximately 3.14159265358979323846...The diameter of a circle is twice the radius. Given the diameter or radius of a circle, we can find the circumference. We can also find the diameter (and radius) of a circle given the circumference. The formulas for diameter and circumference of a circle are listed below. We round to 3.14 in order to simplify our calculations.

30" circumference (distance around) is a little more complicated...

The number is the ratio of the circumference of a circle to the diameter. The value of is approximately 3.14159265358979323846...The diameter of a circle is twice the radius. Given the diameter or radius of a circle, we can find the circumference. We can also find the diameter (and radius) of a circle given the circumference. The formulas for diameter and circumference of a circle are listed below. We round to 3.14 in order to simplify our calculations.

Nov 17, 2009 | Gateway FPD1975W 19" LCD Monitor

assuming the question is what is the circle equation?

and if (-2,2) is the center of the circle

the equation should look like this: (x+2)^2+(Y-2)^2=R^2

And now only R is needed.

given 2x-5y+4=0 equation of line perpendicular

we can rearange the equation to be y=(2x+4)/5

from that we can see that the slope of the line is 2/5

And from the fact of perpendicular line we can say that the slope

of the radius line is -2/5.

The motivation now is to calculate the distance between the center of the circle to the cross point of the radius with the line perpendicular

For that we would calculate the radius line equation and compare it to the equation of line perpendicular

As mentioned earlier the slope of the radious line is -2/5.

So the equation is y=-2/5x+b and b can be calculated by using the center of the circle coordinates

2= - (2/5)*(-2)+b ------> b=2-4/5=1.2

radius equation is y=-(2/5)x+1.2

Now the cross point is calculated by comparing the equations:

-(2/5)x+1.2=(2x+4)/5 --> -2x+6=2x+4 --> 4x=2 --> x=1/2 --> y=1

So the cross point is (1/2,1).

The distance between the points is calculated by the following

Formula:

R=SQR(((1/2)-(-2))^2+(2-1)^2)=SQR(2.5^2+1^2)=SQR(6.25+1)=

SQR(7.25)

Therefore the circle eq is (x+2)^2+(Y-2)^2=7.25

and if (-2,2) is the center of the circle

the equation should look like this: (x+2)^2+(Y-2)^2=R^2

And now only R is needed.

given 2x-5y+4=0 equation of line perpendicular

we can rearange the equation to be y=(2x+4)/5

from that we can see that the slope of the line is 2/5

And from the fact of perpendicular line we can say that the slope

of the radius line is -2/5.

The motivation now is to calculate the distance between the center of the circle to the cross point of the radius with the line perpendicular

For that we would calculate the radius line equation and compare it to the equation of line perpendicular

As mentioned earlier the slope of the radious line is -2/5.

So the equation is y=-2/5x+b and b can be calculated by using the center of the circle coordinates

2= - (2/5)*(-2)+b ------> b=2-4/5=1.2

radius equation is y=-(2/5)x+1.2

Now the cross point is calculated by comparing the equations:

-(2/5)x+1.2=(2x+4)/5 --> -2x+6=2x+4 --> 4x=2 --> x=1/2 --> y=1

So the cross point is (1/2,1).

The distance between the points is calculated by the following

Formula:

R=SQR(((1/2)-(-2))^2+(2-1)^2)=SQR(2.5^2+1^2)=SQR(6.25+1)=

SQR(7.25)

Therefore the circle eq is (x+2)^2+(Y-2)^2=7.25

Oct 26, 2008 | Casio FX-115ES Scientific Calculator

I googled Hunter sprinkler heads and where to purchase them. In my area (the East bay, Tri-Valley) in Nothern California.

I went to Ewing Irrigation in Dublin, CA and found the Hunter sprinkler heads there. The man working the counter got two for me and he demonstrated how to change the head by unscrewing it from the base at or just below ground level by removing the old one and screwing in the new head. He also showed me how to adjust them with the spray pattern. You will need the little tool that comes with the sprayer head.

Making sure the center arrow is completely to the left and rotate the head to the right then back to left. They are set to a 180% spray pattern from the manufacturer. If you want a bigger pattern you turn the adjuster toward the ( + ) side and if you want less pattern you turn the adjuster to the ( - ) side. He showed me how to install the red sprayer inserts by simply pushing them in the cavity making sure the little u shaped indentation is pointing up to allow for the set screw to go through to adjust the spary.The spray varies in distance and amount of water being emitted from the head depending upon the insert used.

I was able to replace the Hunter head, adjust the spray and changed out the insert a few times until I found the one I liked. I used needle nose pliers to remove the initial spray insert that the man @ Ewing installed until I found the one that worked best.

I found using needle nose pliers makes it very easy to grasp the little inserts for replacing.

-Terry

I went to Ewing Irrigation in Dublin, CA and found the Hunter sprinkler heads there. The man working the counter got two for me and he demonstrated how to change the head by unscrewing it from the base at or just below ground level by removing the old one and screwing in the new head. He also showed me how to adjust them with the spray pattern. You will need the little tool that comes with the sprayer head.

Making sure the center arrow is completely to the left and rotate the head to the right then back to left. They are set to a 180% spray pattern from the manufacturer. If you want a bigger pattern you turn the adjuster toward the ( + ) side and if you want less pattern you turn the adjuster to the ( - ) side. He showed me how to install the red sprayer inserts by simply pushing them in the cavity making sure the little u shaped indentation is pointing up to allow for the set screw to go through to adjust the spary.The spray varies in distance and amount of water being emitted from the head depending upon the insert used.

I was able to replace the Hunter head, adjust the spray and changed out the insert a few times until I found the one I liked. I used needle nose pliers to remove the initial spray insert that the man @ Ewing installed until I found the one that worked best.

I found using needle nose pliers makes it very easy to grasp the little inserts for replacing.

-Terry

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