V. ADVANCEDTECHNIQUES. Charges constructed employing advanced techniques generally produce more poaitive resets while using less exploaive than required by conventional or standard formulas. Disadvantages of advanced technique charges are that they usually require mors time to construct and once constructed they ire usually more lraglle thin ccntenUonil charges. Following are rules of thumb for various charges and the targets they ars designed to destroy.
a. Saddle Charge. This charge can be used to cut mild steel cylindrical targets up u> 8 inches in diameter. Dimensions are is follows: The short bsse of the charge Is equal to one-half the circumference. (S'ote that previously published dimensions ca^ed for three times the base, rather than twice the base.) Thickness of the charge is i/3 block of C3 cr 04 for targets up to 6 inches in diameter: use one-half block thickness for targets from 6 to 8 inches la diameter. Above 8 Inches in diameter, or for alloy of steel shafts, use the diamond charge. Prime the charge frcm the apex of the triangle, and the target Is cut at a point directly under the ehort base by croes-iracture. Neither the saddle nor diamond w:ll produce reliable resuita against non-solid targets, such as gun barrels. These charges benefit from prepackaging or wrapping, providing that no more than one thickness of the wrapping material Is between the charge and the target tc be cut. Heavy wrapping paper or aluminum foil are excellent, and parachute cloth may be used if nothing else is available. (See figure 14.)
b. Diamond Charge. This charge can be used to cut hard or alloy steel cylindrical targets of any size that would conceivably be encountered. It has reliably been used, for instance, against a destroyer propeller ahaft of 17 inch diameter. Dimensions are to follows: The long axis of the diamond charge
Figure 14 Saddle charge m-17 TS Of DETONATION
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