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SDZ Construction: Field Artillery (Indirect Fire) Inter-service Resident Range Safety Course (Intermediate)

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August 2003 What is Artillery? The generic term artillery is given to mounted, large- caliber weapons, such as cannons or rocket launchers, used in land warfare and manned by a crew.

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August 2003 Rockets Highly mobile, rapid-fire, surface-to-surface, free-flight rocket and guided missile. Complements cannon artillery to attack deep targets and to strike at counter fire, air defense and high payoff targets. 12 Rockets in less than 60 seconds at up to six aim points. 2 Missiles in less than 20 seconds at one or two aim points.

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August 2003 HE Family High explosive (HE) White phosphorous (WP) Hexachloroethane (HC) smoke Illumination Anti-personnel improved conventional munitions (APICM) Cannon Artillery Ammunition

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August 2003 Dual-purpose improved conventional munitions (DPICM) Family Area denial artillery munition (ADAM) Remote anti-armor munition (RAAMS) Cannon Artillery Ammunition

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August 2003 Base bleed (BB) DPICM family Copperhead family Rocket-assisted projectile (RAP) family Sense and destroy armor (SADARM) Cannon Artillery Ammunition

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August 2003

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Rocket Artillery Ammunition

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August 2003 Degrees or Mils? Mil is short for milliradian (one-thousandth of a radian) A radian is a unit of measure for angles. Mils are more accurate than degrees In a complete circle, 360°, there are 2 radians (6.283 radians). 1000 milliradians = one radian There are 6283 milliradians in a circle. Weve made things simpler by standardizing 6400 mils in a circle.

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August 2003 Standard Conversion Formula: 1 degree = 17.777… mils To convert degrees to mils: Multiply degrees times 17.78 45° x 17.78 = 800.1 or 800 mils To convert mils to degrees: Divide mils by 17.78 3200 ÷ 17.78 = 179.9 or 180° Converting Degrees and Mils

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August 2003 Degrees Scale Mils Scale Index True-ing the Protractor

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August 2003 Constructing an Indirect-Fire Field Artillery SDZ Construct the SDZ for the 155mm Howitzer, PROJ, HE, M107, FUZE, PD, M557. Dimensions of the SDZ for this weapon system are given in DA-PAM 385-63, Chapter 11, Table 11-1, and Figure 11- 1.

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August 2003 Weapon: Ammo Type: Left Limit of Fire: Right Limit of Fire: Maximum Range: Mid Range: Minimum Range: PE (Deflection): PE (Range): Legend for Field Artillery Area A: Area B: Area C: Area E: Map Scale: Map Sheet: Map Series: Map Edition: Date: Name:

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August 2003 8PE Distance X Area E Area A Area B Impact Area Area C Area D Firing Point Target Area 12PE

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August 2003 Plot the targets. Plot the firing point.

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August 2003 From the worksheet, locate and draw the right lateral limit. From the worksheet, locate and draw the left lateral limit. Right lateral limit = Left lateral limit = 5740 mils 5480 mils

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August 2003 Find the maximum range. Find the minimum range. Maximum range = Minimum range = 6750m 5550m This completes the Target Area. Target Area From the firing point, scribe an arc at maximum range. From the firing point, scribe an arc at minimum range.

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August 2003 Minimum Range + 5550m Compute Mid-Range To determine mid-range, add together the maximum range and the minimum range and divide the total by 2: Maximum Range 6750m 12,300 ÷ 2 = 12,300m Mid-Range = 6150m 6150m

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August 2003 Probable Error Deflection (PE D ) 8 Probable Error Constraints Probable Error Range (PE R ) Downrange8 Uprange12

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August 2003 Probable Error Constraints From Table G (Charge 4G), Column 1, find the mid range and locate the probable errors for this range. PE D = PE R = 25 5 12345678910111213 RANGERANGE ELEVELEV Probable Errors Angle of Fall COT Angle of Fall TML VELMO RD Fuze M564 HBTBRB MMILMMMSECMMILM/SMMIL 5500 6000 6500 7000 344.9 389.0 438.3 495.5 20 23 25 28 45564556 12 14 17 20 0.11 0.12 0.13 0.14 30 32 33 35 389 441 500 565 2.5 2.2 1.9 1.6 262 259 257 255 517 647 804 1002 0.142 0.199 0.287 0.445 -0.12 -0.171 -0.238 -0.347

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August 2003 From the firing point, draw lines through tic marks out past the target area. Calculate the PE D 8 x 5 = 40 (ˆ50m) At the mid range, measure out 50m and draw tic marks. Target Area

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August 2003 From the firing point, scribe an arc through the tic mark. Calculate the up-range PE R 12 x 25 = 300m At the uprange limit of the Target Area, measure back 300m toward the firing point. Target Area Draw a tic mark.

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August 2003 From the firing point, scribe an arc through the tic mark. Calculate the downrange PE R 8 x 25 = 200m At the downrange limit of the Target Area, measure out 200m away from the firing point. Target Area Draw a tic mark. This completes the Impact Area. Impact Area

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August 2003 Draw straight lines through the tic marks. From Table 11-1, find Area A. Area A = From the lateral limits of the Impact Area, measure out 750m. Target Area Draw tic marks. 725m (ˆ750m) Impact Area

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August 2003 From the firing point, scribe an arc through the tic mark. From Table 11-1, find Area B. Area B = From the down- range limit of the Impact Area, measure out 750m. Target Area Draw a tic mark. 725m (ˆ750m) Impact Area

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August 2003 Draw straight lines through the tic marks. At the firing point, measure 25° to the left and right from the limits of the impact area. Target Area Draw tic marks. 25° Impact Area

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August 2003 Area C Area C is the secondary danger area (buffer zone) on the up-range side of the impact area and parallel to Area B which contains fragments, debris, and components from exploding projectiles functioning on the near edge of the impact area.

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August 2003 Draw a tic mark at the Area C measurement. Extend the up- range limit of the Impact Area. Target Area From Table 11-1, find the measurement of Area C. Impact Area Area C =350m From the firing point, scribe an arc through the tic mark.

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August 2003 This completes Area C. Connect the up- range and down- range lateral limits of Area C as shown. Target Area Impact Area

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August 2003 Area A Area B This completes Area C. Connect the up- range and down- range lateral limits of Area C as shown. Target Area Impact Area Annotate Areas A, B, and C on the legend. Area C Erase any unnecessary lines.

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August 2003 Area A Area B This completes Area C. Connect the up- range and down- range lateral limits of Area C as shown. Target Area Impact Area Annotate Areas A, B, and C on the legend. Area C Erase any unnecessary lines.

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August 2003 Area E Area E is the danger area between an indirect fire weapon system and Area D. this area is endangered by muzzle debris, overpressure, blast, and hazardous impulse noise.

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August 2003 Area A Area B Target Area Impact Area Area C From the firing point, scribe an arc through the tic mark for Area E. From Table 11-1, find Area E. Area E = From the firing point, measure down-range 750m. Draw a tic mark. 725m (ˆ750m) This completes Area E.

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August 2003 Area A Area B Target Area Impact Area Area C Annotate Area E on the legend. Area E

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August 2003 Area D Area D is the safe area between Areas C and E for indirect, overhead fire of unprotected personnel.

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August 2003 Area A Area B Target Area Impact Area Area C Annotate Area D on the legend. Area E Area D

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August 2003 Weapon:155mm Howitzer Ammo Type:M557 HE PD Left Limit of Fire:5480 mils Right Limit of Fire:5740 mils Maximum Range:6750m Mid Range:6150m Minimum Range:5550m PE (Deflection):50m PE (Range):300m / 200m Legend for Artillery Area A:750m Area B:750m Area C:350m Area E:750m Map Scale:1:50,000 Map Sheet: Map Series: Map Edition: Date: Name:

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