Flashcards in Chapter 11 Deck (14):
What explosive effect do concrete breaching charges create?
What formula do you use on rebar reinforcement?
P = D
What are the rounding rules for breaching radius?
External: Round Breaching Radius up to the nearest 1/2 foot. Internal: Find 1/2 the breaching radius then Round breaching radius up to the nearest 1/4 foot.
What kind of target is a counter force charge effective against?
Rectangular masonry or concrete columns 4' FT thick or less.
When using a counterforce charge what must the target have?
At least 3 faces or be freestanding
How should you place counterforce charges?
What does a counterforce charge rely on in order to destroy the target?
What should you do with the breaching radius measurement for a counterforce charge?
Round breaching radius up to the nearest 1/2 FT (its an external charge)
What are the critical factors?
size, shape, placememt, tamping
What are the Charge thickness'es (breaching)?
0 LB - 4.99 LB (1"inch) 5 LB - 39.99 LB (2"inch) 40 LB - 299 LB (4"inch) 300 LB (8"inch)
What is the breaching formula?
P = R3KC
What is the formula for number of charges?
N = W / 2R
Number of charges formula rules?
N < 1.25 use 1 charge. N > 1.25 but < 2.5 use 2 charges. N = to or > 2.5 round off