Transcript SDZ Construction: M242 25mm Gun

SDZ Construction:
M242 25mm Gun
Inter-service Resident Range Safety Course
(Intermediate)
M2A3 Bradley Fighting Vehicle
August 2003
M242 25mm Gun
Marine Corps Light Armored Vehicle (LAV)
with the M242 25mm gun
August 2003
25mm Ammunition
M791
APDS-T
M792
HEI-T
M793
TP-T
M794
M910
August 2003
Legend for 25mm Systems
Weapon:
Ammo Type:
Impact Media:
Distance X:
Angle P:
Distance W:
Area A:
Area B:
Map Scale:
Map Sheet:
Map Series:
Map Edition:
Date:
Name:
August 2003
Constructing a 25mm SDZ
Construct 25mm system SDZ for the
M242 25mm gun firing the M792 (HEIT) cartridge into armor.
Dimensions of the SDZ for this weapon
system are given in DA-PAM 385-63,
Chapter 12, Table 12-5.
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
Distance X = 6379m
(ˆ 6400m)
Annotate
Distance X on the
legend.
At the firing point,
measure 5° with a
protractor from the
left and right of the
gun target line.
Distance X
From Table 12-5, find
Distance X (armor).
5°
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To establish the
Dispersion Area,
draw a straight
line from the firing
position through
each tic mark out
to Distance X.
This completes the
Dispersion Area.
Distance X
Draw tic marks as
shown.
Dispersion
Area
5°
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Distance W = 1373m
(ˆ 1400m)
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
(armor).
Dispersion
Area
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Draw a straight
line through the tic
marks.
Distance X
Draw tic marks at
the measurement
for Distance W on
the lines just
drawn.
Dispersion
Area
On Table 12-5,
find the measurement for Angle P.
Angle P = 28°
P P
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Distance X
At the firing point,
measure 28° from
the left and right
limits of the
Dispersion Area to
establish the
Ricochet Area.
Draw tic marks.
Dispersion
Area
28°
P P
August 2003
This completes the
Ricochet Area.
Distance X
Draw a straight line
from the firing point
through each tic
mark just drawn.
Dispersion
Area
28°
P P
August 2003
This completes the
Ricochet Area.
Annotate the
Ricochet Area
(Distance W) on the
legend.
Distance X
Draw a straight line
from the firing point
through each tic
mark just drawn.
Ricochet
Area
Dispersion
Area
August 2003
Erase unnecessary
lines.
Distance X
From the firing
position, 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 unnecessary
lines.
Distance X
From the firing
position, scribe an
arc between the
left and right limits
of the Ricochet
Area. Use
Distance X as the
radius.
Ricochet
Area
Dispersion
Area
On Table 12-5,
find the measurement for Area A.
Area A = 300m
August 2003
Draw tic marks at
the measurement
for Area A.
Draw straight lines
through the tic
marks just drawn.
Distance X
Lightly draw lines
perpendicular to
the limits of the
Ricochet Area.
Ricochet
Area
Dispersion
Area
August 2003
Draw tic marks.
From the firing
point, draw straight
lines through the tic
marks.
Distance X
At the firing point,
measure 25° from
the left and right
limits of the
Ricochet Area.
Ricochet
Area
Dispersion
Area
25°
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Area B = 400m
Lightly draw a line
that extends the gun
target line from
Distance X.
Verify that the
measurement for
Distance X is correct;
then place a tic mark
at the measurement
for Area B.
Distance X
On Table 12-5, find
the measurement for
Area B.
Ricochet
Area
Dispersion
Area
25°
August 2003
This completes
Areas A and B.
Distance X
From the firing
point, scribe an arc
from the right and
left limits of Area A
using the measurement for Area B as
the radius.
Ricochet
Area
Dispersion
Area
25°
August 2003
Area B
This completes
Areas A and B.
Area A
Distance X
From the firing
point, scribe an arc
from the right and
left limits of Area A
using the measurement for Area B as
the radius.
Ricochet
Area
Dispersion
Area
Annotate Areas A
and B on the legend.
To complete the SDZ,
erase all unnecessary
lines.
August 2003
Area B
This completes
Areas A and B.
Area A
Distance X
From the firing
point, scribe an arc
from the right and
left limits of Area A
using the measurement for Area B as
the radius.
Ricochet
Area
Dispersion
Area
Annotate Areas A
and B on the legend.
To complete the SDZ,
erase all unnecessary
lines.
August 2003
Legend for 25mm Systems
Weapon:
M242 25mm Gun
Ammo Type:
M792 (HEI-T)
Impact Media:
Armor
Distance X:
6379m (ˆ6400m)
Angle P:
28°
Distance W:
1373m (ˆ1400m)
Area A:
300m
Area B:
400m
Map Scale:
1:50,000
Map Sheet:
Map Series:
Map Edition:
Date:
Name:
August 2003