Transcript SDZ Construction: Firing Lanes Range

SDZ Construction:
Firing Lanes Range
Inter-service Resident Range Safety
Course (Intermediate)
Review of SDZ Construction
Fundamentals
All SDZs, regardless of complexity, are
drawn from a point or points of
reference.
To construct an accurate and precise
SDZ, you will need the following:
Compass for drawing circles and arcs
Protractor for measuring angles
Plotting scale for measuring distances
Fine-point pencil for drawing accuracy
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Mils Scale
Degrees
Scale
Index
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The M240G medium machine
gun and the M80 Ball Cartridge
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The M240G Machine Gun is a general purpose
machine gun. It fires the standard NATO 7.62 mm
round and is used as a general support weapon. It
has an integral, folding bipod and can also be
mounted on a folding tripod.
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Small Arms Legend (Batwing)
Weapon:
Ammo Type:
Impact Media:
Distance X:
Distance Y:
Angle P:
Angle Q:
Distance W:
Map Scale:
Map Sheet:
Map Series:
Map Edition:
Date:
Name:
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Constructing a Batwing SDZ
Construct a batwing SDZ for the M240G
Machine Gun firing M80 Ball cartridge
with multiple fixed firing points and
targets.
Map Scale: 1:25,000.
Dimensions of the SDZ for this weapon
system are given in DA-PAM 385-63,
Appendix B, Table B-1.
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Plot the firing points and the baseline.
Plot the targets.
Draw a gun target lines on the extreme left and right firing
positions.
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Distance X
From Appendix B, Table B-1, find Distance X for the
7.62mm M80 Ball.
Distance X = 4100m
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Distance X
Annotate Distance X on the legend.
The left and right gun target lines are the left and right
limits of fire.
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Distance X
5°
5°
For the Dispersion Area, at the firing point on the left limit
of fire, measure with a protractor a 5° Angle. Do the same
on the right.
Draw tic marks as shown.
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Distance X
Dispersion
Area
5°
5°
From where the left and right limits of fire intersect the
firing line, draw a line through the tic marks out through
Distance X.
This completes the Dispersion Area.
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Distance Y
Distance Y is the maximum Distance
downrange at which a lateral ricochet is
expected to occur when a projectile is
fired at a given quadrant elevation.
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Distance Y
Distance X
Dispersion
Area
Using Table B-1, find the measurement for Distance Y.
Distance Y = 4073m (ˆ4080m)
Annotate Distance Y on the legend.
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Distance Y
Distance X
Dispersion
Area
Place tic marks at Distance Y on both the right and left
lateral limits of the Dispersion Area.
Next, determine angles P & Q.
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Angles P & Q
Angles P & Q are used to determine the
Ricochet Area.
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Angle P
Angle P is the angle measured from the
left and right side of the Dispersion Area
from the firing point. (Round the angle
to the nearest safe whole degree.)
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Distance Y
Distance X
Dispersion
Area
P
P
From Table B-1, find Angle P.
Angle P = 43.54° (ˆ44°)
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Distance Y
Distance X
Dispersion
Area
44°
P
44°
P
At the firing point, from the left and right limits of the
Dispersion Area, measure 44° for the Ricochet Area,
Angle P.
Draw tic marks as shown.
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Distance Y
Distance X
Dispersion
Area
44°
P
44°
P
From the firing point, draw a straight line point through the
tic marks.
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Angle Q
Angle Q is the angle measured from the
left and right side of the Dispersion Area
from Distance Y. (Round the angle to
the nearest safe whole degree.)
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Q
Distance Y
Distance X
Q
Dispersion
Area
44°
P
44°
P
From the table, find Angle Q.
Angle Q = 38.90° (ˆ39°)
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39°
39°
Q
Distance Y
Distance X
Q
Dispersion
Area
44°
P
44°
P
At Distance Y, from the left and right limits of the
Dispersion Area, measure 39° for Angle Q.
Draw tic marks as shown.
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39°
39°
Q
Distance Y
Distance X
Q
Dispersion
Area
44°
P
44°
P
Draw a straight line from the tic marks at Distance Y
through the tic marks just drawn.
Next, find Distance W.
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Distance W
Distance W is the maximum lateral
distance a projectile will ricochet after
impacting within the Dispersion Area.
Distance W defines the maximum
lateral edge of the Ricochet Area.
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39°
39°
Q
Distance Y
Distance X
Q
Dispersion
Area
44°
P
44°
P
On both the right and left, lightly draw lines perpendicular
to the lateral limits of the Dispersion Area.
Using Table B-1, find the measurement for Distance W.
Distance W = 1461m (ˆ1480m)
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39°
39°
Q
Distance Y
Distance X
Q
Dispersion
Area
44°
P
44°
P
Draw tic marks at the measurement of Distance W.
Draw a straight line through the tic marks and through
the lines previously drawn for angles P and Q.
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39°
39°
Q
Distance Y
Distance X
Q
Dispersion
Area
44°
P
44°
P
This completes the Ricochet Area.
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Distance Y
Distance X
Dispersion
Area
Ricochet
Area
This completes the Ricochet Area.
Annotate the Ricochet Area (Distance W) on the
legend.
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Distance Y
Distance X
Dispersion
Area
Ricochet
Area
From the right and left firing points and using Distance X
as the radius, scribe an arc between the right and left
limits of fire and the right and left limits of the Dispersion
Areas.
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Distance Y
Distance X
Dispersion
Area
Ricochet
Area
At Distance X, draw a straight line between the right
and left limits of fire.
To complete the SDZ, erase any unnecessary lines.
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Distance Y
Distance X
Dispersion
Area
Ricochet
Area
At Distance X, draw a straight line between the right
and left limits of fire.
To complete the SDZ, erase any unnecessary lines.
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Small Arms Legend (Batwing)
Weapon:
M240G Machine Gun
Ammo Type:
7.62mm M80 Ball
Impact Media:
Earth
Distance X:
4100m
Distance Y:
4073m (ˆ4080m)
Angle P:
43.54° (ˆ44°)
Angle Q:
38.90° (ˆ39°)
Distance W:
1461m (ˆ1480m)
Map Scale:
1:25,000
Map Sheet:
Map Series:
Map Edition:
Date:
Name:
August 2003