SDZ Construction:
120mm Tank Cannon
Inter-service Resident Range Safety Course
(Intermediate)
120mm Ammunition
August 2003
Legend for 120mm Tank Cannon
Weapon:
Ammo Type:
Distance X:
Angle P:
Distance W:
Area A:
Area B:
Map Scale:
Map Sheet:
Map Series:
Map Edition:
Date:
Name:
August 2003
Constructing 120mm Tank Cannon SDZ
Construct a 120mm tank cannon SDZ
for that weapon firing the M830 HEATMP-T cartridge into steel.
Dimensions of the SDZ for this weapon
system are given in DA-PAM 385-63,
Chapter 12, Table 12-2.
First, plot the firing point, target, and
then establish the gun target line.
August 2003
Plot the target.
Establish the gun target line.
Plot the firing point.
August 2003
From Table 12-2,
find Distance X
(steel).
Annotate
Distance X on
the legend.
Distance X
Distance X =
6589m (ˆ6600m)
August 2003
Draw tic marks
as shown.
Distance X
At the firing point,
measure 5° from
the left and right
of the gun target
line.
5°
August 2003
This completes
the Dispersion
Area.
Distance X
To establish the
lateral limits of
the Dispersion
Area, draw a
straight line from
the firing position
through each tic
mark out to
Distance X.
5°
Dispersion
Area
August 2003
Distance W =
600m
Lightly draw lines
perpendicular to
the limits of the
Dispersion Area.
Distance X
For the Ricochet
Area, on Table
12-5, find the
measurement for
Distance W
(steel).
Dispersion
Area
August 2003
Draw straight
lines through
the tic marks.
Distance X
Draw tic marks
at the
measurement
for Distance W
on the lines just
drawn.
Dispersion
Area
August 2003
On Table 12-2,
find the Angle P.
At the firing
point, measure
12° from the left
and right limits
of the
Dispersion Area.
Distance X
Angle P = 12°
12°
Draw tic marks.
P
P
Dispersion
Area
August 2003
This completes
the Ricochet
Area.
Annotate the
Ricochet Area
on the legend.
Distance X
Draw a straight
line from the
firing point
through each tic
mark just drawn.
Ricochet
Area
12°
P
P
Dispersion
Area
August 2003
Erase any
unnecessary
lines.
Distance X
From the firing
point, scribe an
arc between the
left and right limits
of the Ricochet
Area. Use
Distance X as the
radius.
Ricochet
Area
Dispersion
Area
August 2003
Erase any
unnecessary
lines.
Distance X
From the firing
point, scribe an
arc between the
left and right limits
of the Ricochet
Area. Use
Distance X as the
radius.
Ricochet
Area
Dispersion
Area
August 2003
On Table 12-2,
find the
measurement for
Area A.
Lightly draw lines
perpendicular to
the limits of the
Ricochet Area.
Draw tic marks at
the measurement
for Area A.
Distance X
Area A = 1,125m
(ˆ1,150m)
Ricochet
Area
Dispersion
Area
August 2003
On Table 12-2,
find the
measurement for
Area B.
Area B = 1,125m
(ˆ1,150m)
Lightly draw a line
extending the gun
target line the
measurement of
Area B.
Distance X
Draw straight lines
through the tic
marks.
Ricochet
Area
Dispersion
Area
August 2003
Draw a tic mark at
the measurement
for Area B.
Place the needle
of the compass at
the firing point
and scribe an arc
through the tic
mark between the
limits of Area A.
From the firing
point, measure 25°
to the right and left
of the limits of the
Ricochet Area.
Ricochet
Area
25°
Dispersion
Area
August 2003
Area B
Draw tic marks.
This completes
Areas A and B.
Area A
Distance X
From the firing
point, draw
straight lines out
through the tic
marks as shown.
Ricochet
Area
Erase any
unnecessary lines.
25°
Dispersion
Area
August 2003
Area B
Draw tic marks.
This completes
Areas A and B.
Area A
Distance X
From the firing
point, draw
straight lines out
through the tic
marks as shown.
Ricochet
Area
Erase any
unnecessary lines.
Dispersion
Area
August 2003
Legend for 120mm Tank Cannon
Weapon:
120mm Tank
Ammo Type:
M830 HEAT-MP-T
Distance X:
6589m (ˆ6600m)
Angle P:
12°
Distance W:
600m
Area A:
1125m (ˆ1,150m)
Area B:
1125m (ˆ1,150m)
Map Scale:
1:50,000
Map Sheet:
Map Series:
Map Edition:
Date:
Name:
August 2003