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THRUST FORCE OF NELSON BIG GUN
The thrust force for the Big Gun can be calculated by knowing the flow rate through the gun and
the nozzle pressure of the gun. The following equation shows the relationship.
where,
As seen in the diagram above, the thrust force is directly opposite the nozzle exit. Since the thrust force
(T) is now know, the horizontal (H) and vertical (V) thrust force can be calculated using trigonometry.
The tables below show values of thrust force (T) and horizontal thrust force (H) for the 150 and 200
Big Guns of varying pressures and nozzles sizes.
T — THRUST FORCE OF 150 BIG GUN NOZZLES (LB.)
r P
s e
u s
e r
N
o
P
I S
. 0
5
0
3
6
0
4
7
0
5
8
0
6
9
0
6
1
0
0
7
1
1
0
8
1
2
0
9
Nelson Irrigation Corp. 848 Airport Rd. Walla Walla, WA 99362-2271 USA Tel: 509.525.7660 Fax: 509.525.7907 E-mail: info@nelsonirrigation.com Web site: www.nelsonirrigation.com
RISER STABILITY AND THRUST FORCE
T = thrust force of the nozzle (lb.)
P = nozzle pressure (psi)
Q = flow rate (gpm)
H = T cos (gun angle from horizontal)
V = T sin (gun angle from horizontal)
z z
e l
N
o
z z
e l
" 7
. 0
" 8
7
4
8
5
5
8
3
6
8
0
7
8
8
8
7
5
9
7
3
1
0
8
1
1
1
8
(
)
Q
T = 2P
38 P
N
o
z z
e l
N
o
z z
e l
. 0
" 9
. 1
" 0
6
2
7
6
7
4
9
2
8
7
1
0
8
9
9
1
2
3
1
1
1
1
3
7
1
2
4
1
5
3
1
3
6
1
6
8
1
4
9
1
8
5
NOZZLES
®
(1)
(2)
(3)
N
o
z z
e l
N
o
z z
e l
. 1
" 1
. 1
" 2
9
5
1
1
2
1
1
2
1
3
5
1
3
0
1
5
6
1
4
8
1
7
9
1
6
7
2
0
2
1
8
7
2
2
4
2
0
4
2
4
6
2
2
2
2
6
8
N
o
z z
e l
. 1
" 3
1
3
0
1
5
7
1
8
3
2
1
0
2
3
7
2
6
3
2
9
0
3
1
4
17
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