Funnel Shaped Charge

Section II

No. 9

An effective shaped charge can be made using various types of commercial funnels. See table for penetration capabilities.


  • Container (soda or beer can, etc.), approximately 2-1/2 in. diameter x 5 in. long (6-1/4 cm x 12-1/2 cm)
  • Funnel(s) (glass, steel, or aluminum) 2-1/2 in. (6-1/2cm) in diameter
  • Wooden rod or stick, 1/4 in. (6 mm) in diameter
  • Tape
  • Blasting cap (electrical or non-electrical)
  • Sharp cutting edge
  • Explosive


1. Remove the top and bottom from can and discard.

2. Cut off and throw away the spout of the funnel(s).

NOTE: When using 3 funnels (see table), place the modified funnels together as tight and as straight as possible. Tape the funnels together at the outer ridges.

3. Place the funnel(s) in the modified can. Tape on outer ridges to hold funnel(s) to can.

4. If plastic explosive is used, fill the can with the explosive using small quantities, and tamp with wooden rod or stick.

NOTE: If castable explosive is used, refer to step 4 of Section n, No. 3.

5. Cut wooden rod to lengths 3 inches longer than the standoff length. (See table.) Position three of these rods around the explosive filled can

and hold in place with tape.

NOTE: The position of the rods on the container must conform to standoff dimensions to obtain the penetrations given in the table.

6. Make a hole for blasting cap in the center of the explosive with rod or stick.

CAUTION: Do not place blasting cap in place until the Funnel Shaped Charge is ready for use.


1. Place blasting cap in the hole in top of the charge. If non-electric cap is used, be sure cap is crimped around fuse and fuse is long enough to provide safe delay.

2. Place (tape if necessary) the Funnel Shaped Charge on the target so so that nothing is between the base of charge and target.

3. If electric cap is used, connect blasting cap wires to firing circuit.

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