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## SDZ Construction: Firing Lanes Range

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**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 August 2003**Mils Scale**Degrees Scale Index August 2003**The M240G medium machine gun and the M80 Ball Cartridge**August 2003**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. August 2003**Small Arms Legend (Batwing)**August 2003**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. August 2003**Plot the firing points and the baseline.**• Plot the targets. • Draw a gun target lines on the extreme left and right firing positions. August 2003**Distance X**• From Appendix B, Table B-1, find Distance X for the 7.62mm M80 Ball. • Distance X = 4100m August 2003**The left and right gun target lines are the left and right**limits of fire. Distance X • Annotate Distance X on the legend. August 2003**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. August 2003**Dispersion**Area Distance X 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. August 2003**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. August 2003**Dispersion**Area Distance X Distance Y • Using Table B-1, find the measurement for Distance Y. (ˆ4080m) 4073m • Distance Y = • Annotate Distance Y on the legend. August 2003**Dispersion**Area Distance X Distance Y • Place tic marks at Distance Y on both the right and left lateral limits of the Dispersion Area. • Next, determine angles P & Q. August 2003**Angles P & Q**• Angles P & Q are used to determine the Ricochet Area. August 2003**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.) August 2003**Dispersion**Area Distance X Distance Y P P • From Table B-1, find Angle P. • Angle P = 43.54° (ˆ44°) August 2003**Dispersion**Area Distance X Distance Y 44° 44° P 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. August 2003**Dispersion**Area Distance X Distance Y 44° 44° P P • From the firing point, draw a straight line point through the tic marks. August 2003**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.) August 2003**Q**Q Dispersion Area Distance X Distance Y 44° 44° P P • From the table, find Angle Q. • Angle Q = 38.90° (ˆ39°) August 2003**39°**39° Dispersion Area Distance X Distance Y 44° 44° P P Q Q • At Distance Y, from the left and right limits of the Dispersion Area, measure 39° for Angle Q. • Draw tic marks as shown. August 2003**39°**39° Dispersion Area Distance X Distance Y 44° 44° P P Q Q • Draw a straight line from the tic marks at Distance Y through the tic marks just drawn. • Next, find Distance W. August 2003**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. August 2003**39°**39° Dispersion Area Distance X Distance Y 44° 44° P P Q Q • 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) August 2003**39°**39° Dispersion Area Distance X Distance Y 44° 44° P P Q Q • 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. August 2003**39°**39° Q Q Dispersion Area Distance X Distance Y 44° 44° P P • This completes the Ricochet Area. August 2003**Dispersion**Area Distance X Distance Y Ricochet Area • This completes the Ricochet Area. • Annotate the Ricochet Area (Distance W) on the legend. August 2003**Dispersion**Area Distance X Distance Y 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. August 2003**Dispersion**Area Distance X Distance Y 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. August 2003**Dispersion**Area Distance X Distance Y 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. August 2003**Small Arms Legend (Batwing)**August 2003