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SDZ Construction: M242 25mm Gun

SDZ Construction: M242 25mm Gun. Inter-service Resident Range Safety Course (Intermediate). M2A3 Bradley Fighting Vehicle. M242 25mm Gun. Marine Corps Light Armored Vehicle (LAV) with the M242 25mm gun. M791 APDS-T. M792 HEI-T. M793 TP-T. M794. M910. 25mm Ammunition.

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SDZ Construction: M242 25mm Gun

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  1. SDZ Construction:M242 25mm Gun Inter-service Resident Range Safety Course (Intermediate)

  2. M2A3 Bradley Fighting Vehicle August 2003

  3. M242 25mm Gun Marine Corps Light Armored Vehicle(LAV) with the M242 25mm gun August 2003

  4. M791APDS-T M792HEI-T M793TP-T M794 M910 25mm Ammunition August 2003

  5. Legend for 25mm Systems August 2003

  6. Constructing a 25mm SDZ • Construct 25mm system SDZ for the M242 25mm gun firing the M792 (HEI-T) 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

  7. Plot the firing point. • Plot the target. • Establish the gun target line. August 2003

  8. From Table 12-5, find Distance X (armor). • Distance X = 6379m (ˆ 6400m) • Annotate Distance X on the legend. Distance X • At the firing point, measure 5° with a protractor from the left and right of the gun target line. 5° August 2003

  9. Dispersion Area 5° • Draw tic marks as shown. • To establish 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

  10. Dispersion Area • For the Ricochet Area, on Table 12-5, find the measurement for Distance W (armor). Distance X • Distance W = 1373m (ˆ 1400m) • Lightly draw lines perpendicular to the limits of the Dispersion Area. August 2003

  11. Dispersion Area P P • Draw tic marks at the measurement for Distance W on the lines just drawn. • Draw a straight line through the tic marks. Distance X • On Table 12-5, find the measure-ment for Angle P. • Angle P = 28° August 2003

  12. Dispersion Area P P • At the firing point, measure 28° from the left and right limits of the Dispersion Area to establish the Ricochet Area. Distance X • Draw tic marks. 28° August 2003

  13. Dispersion Area 28° P P • Draw a straight line from the firing point through each tic mark just drawn. • This completes the Ricochet Area. Distance X August 2003

  14. 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 (Distance W) on the legend. August 2003

  15. Ricochet Area Dispersion Area • From the firing position, scribe an arc between the left and right limits of the Ricochet Area. Use Distance X as the radius. Distance X • Erase unnecessary lines. August 2003

  16. Ricochet Area Dispersion Area • From the firing position, scribe an arc between the left and right limits of the Ricochet Area. Use Distance X as the radius. Distance X • Erase unnecessary lines. • On Table 12-5, find the measure-ment for Area A. • Area A = 300m August 2003

  17. Ricochet Area Ricochet Area Dispersion Area Dispersion Area • Lightly draw lines perpendicular to the limits of the Ricochet Area. • Draw tic marks at the measurement for Area A. Distance X • Draw straight lines through the tic marks just drawn. August 2003

  18. Ricochet Area Ricochet Area Dispersion Area Dispersion Area • At the firing point, measure 25° from the left and right limits of the Ricochet Area. Distance X • Draw tic marks. • From the firing point, draw straight lines through the tic marks. 25° August 2003

  19. Ricochet Area Ricochet Area Dispersion Area Dispersion Area • On Table 12-5, find the measurement for Area B. • Area B = 400m • Lightly draw a line that extends the gun target line from Distance X. Distance X • Verify that the measurement for Distance X is correct; then place a tic mark at the measurement for Area B. 25° August 2003

  20. Ricochet Area Ricochet Area Dispersion Area 25° • From the firing point, scribe an arc from the right and left limits of Area A using the measure-ment for Area B as the radius. Distance X • This completes Areas A and B. August 2003

  21. Area B Area A Ricochet Area Ricochet Area Dispersion Area • From the firing point, scribe an arc from the right and left limits of Area A using the measure-ment for Area B as the radius. Distance X • This completes Areas A and B. • Annotate Areas A and B on the legend. • To complete the SDZ, erase all unnecessary lines. August 2003

  22. Area B Area A Ricochet Area Ricochet Area Dispersion Area • From the firing point, scribe an arc from the right and left limits of Area A using the measure-ment for Area B as the radius. Distance X • This completes Areas A and B. • Annotate Areas A and B on the legend. • To complete the SDZ, erase all unnecessary lines. August 2003

  23. Legend for 25mm Systems August 2003

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