SDZ Construction: 120mm Tank Cannon

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SDZ Construction: 120mm Tank Cannon. Inter-service Resident Range Safety Course (Intermediate). 120mm Ammunition. Legend for 120mm Tank Cannon. Constructing 120mm Tank Cannon SDZ. Construct a 120mm tank cannon SDZ for that weapon firing the M830 HEAT-MP-T cartridge into steel.

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### SDZ Construction:120mm Tank Cannon

Inter-service Resident Range Safety Course (Intermediate)

120mm Ammunition

August 2003

Constructing 120mm Tank Cannon SDZ
• Construct a 120mm tank cannon SDZ for that weapon firing the M830 HEAT-MP-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 firing point.
• Plot the target.
• Establish the gun target line.

August 2003

From Table 12-2, find Distance X (steel).
• Distance X =

6589m (ˆ6600m)

• Annotate Distance X on the legend.

Distance X

August 2003

At the firing point, measure 5° from the left and right of the gun target line.

• Draw tic marks as shown.

Distance X

August 2003

Dispersion

Area

• 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.

Distance X

• This completes the Dispersion Area.

August 2003

Dispersion

Area

• For the Ricochet Area, on Table 12-5, find the measurement for Distance W (steel).
• Distance W =

Distance X

600m

• Lightly draw lines perpendicular to the limits of the Dispersion Area.

August 2003

Dispersion

Area

• Draw tic marks at the measurement for Distance W on the lines just drawn.
• Draw straight lines through the tic marks.

Distance X

August 2003

Dispersion

Area

P

P

• On Table 12-2, find the Angle P.
• Angle P =

12°

• At the firing point, measure 12° from the left and right limits of the Dispersion Area.

Distance X

12°

• Draw tic marks.

August 2003

Ricochet

Area

Dispersion

Area

• Draw a straight line from the firing point through each tic mark just drawn.
• This completes the Ricochet Area.

Distance X

• Annotate the Ricochet Area on the legend.

12°

P

P

August 2003

Ricochet

Area

Dispersion

Area

• From the firing point, scribe an arc between the left and right limits of the Ricochet Area. Use Distance X as the radius.

Distance X

Distance X

• Erase any unnecessary lines.

August 2003

Ricochet

Area

Dispersion

Area

• From the firing point, scribe an arc between the left and right limits of the Ricochet Area. Use Distance X as the radius.

Distance X

• Erase any unnecessary lines.

August 2003

Ricochet

Area

Dispersion

Area

• On Table 12-2, find the measurement for Area A.
• Area A =

1,125m

(ˆ1,150m)

• Lightly draw lines perpendicular to the limits of the Ricochet Area.

Distance X

• Draw tic marks at the measurement for Area A.

August 2003

Ricochet

Area

Dispersion

Area

• Draw straight lines through the tic marks.
• On Table 12-2, find the measurement for Area B.

Distance X

• Area B =

1,125m

(ˆ1,150m)

• Lightly draw a line extending the gun target line the measurement of Area B.

August 2003

Ricochet

Area

Dispersion

Area

• 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.

25°

August 2003

Area B

Area A

Ricochet

Area

Dispersion

Area

• Draw tic marks.
• From the firing point, draw straight lines out through the tic marks as shown.
• This completes Areas A and B.

Distance X

• Erase any unnecessary lines.

25°

August 2003

Area B

Area A

Ricochet

Area

Dispersion

Area

• Draw tic marks.
• From the firing point, draw straight lines out through the tic marks as shown.
• This completes Areas A and B.

Distance X

• Erase any unnecessary lines.

August 2003