Cratering

Question 1

To be effective craters must be ____

Answer 1

Too wide for track vehicles to span and too steep sided for vehicles to pass

Question 2

Craters are considered effective if

Answer 2

it takes 4 or more passes for tracked vehicles to pass

Question 3

Hasty crater hole depth

Answer 3

5 feet deep

Question 4

Hasty crater explosives per hole

Answer 4

50 lbs per hole

Question 5

Hasty crater borehole spacing

Answer 5

5 feet center to center, stem after packing

Question 6

Hasty crater blowout

Answer 6

8 feet

Question 7

Hasty crater characteristics

Answer 7

V shaped about 6 to 7 feet deep and 20 to 25 feet wide.

Side slope of 25 to 35 degrees

Question 8

Hasty crater formula

Answer 8

N = (L-16)/5 + 1

Round up number of holes to next higher number

Question 9

Deliberate crater borehole depths

Answer 9

5 and 7 feet

Question 10

Deliberate crater explosive weights

Answer 10

5’ holes have 40 lbs

7’ holes have 80 lbs

Question 11

Deliberate crater bore spacing

Answer 11

5 ft center to center

Question 12

Deliberate crater borehole rules

Answer 12

End boreholes are 7’ deep, no two 5’ holes next to each other

Question 13

Deliberate crater characteristics

Answer 13

V shaped approximately 7 to 8’ deep
25 to 30’ wide with 37 degree slope
Modern tanks require 8 attempts

Question 14

Deliberate crater blowout

Answer 14

8’

Question 15

Deliberate crater formula

Answer 15

N = (L-16)/5 + 1

Round up to next highest number

Question 16

Relieved face crater borehole depth

Answer 16

Friendly side 5 feet deep

Enemy side 4 feet deep

Question 17

Relieved face crater explosive weights

Answer 17

5 feet deep, 40 lbs

4 feet deep, 30 lbs

Question 18

Relieved face crater priming

Answer 18

Prime rows separately with 1/2 to 1.5 second delay. Fire enemy row first

Question 19

Relieved face crater borehole and row spacing

Answer 19

7 feet center to center between boreholes.
8 feet between rows on dirt or gravel roads
12 feet between rows on hard surface

Question 20

Relieved face crater blowout

Answer 20

5’

Question 21

Relieved face crater characteristics

Answer 21

Trapezoidal shaped
7 to 8 feet deep
25 to 30 feet wide with unequal slopes

Question 22

Relieved face crater formula

Answer 22

N = (L-10)/7 + 1
Round up to next highest whole number
Gives friendly side
Subtract one for enemy side

Question 23

Expedient breaching of a hard surface

Answer 23

Use 1 lb of explosive per 2” of pavement. Tamp 2x breaching radius

Question 24

Expedient cratering charge mixture

Answer 24

Ammonium nitrate fertilizer and fuel/oil

Question 25

Nitrogen percentage

Answer 25

At least 33.33 percent

Question 26

Fuel to fertilizer ratio

Answer 26

1 quart fuel to 25lbs fertilizer, soak for one hour

Question 27

Expedient cratering charge priming

Answer 27

Prime with one pound TNT, dual priming recommended

Question 28

Expedient cratering charge 4 steps

Answer 28

1 measure fuel and fertilizer
2 mix fuel and fertilizer
3 allow to sit for 1 hour
4 place half in hole/container, add 2 primed blocks tnt, add remaining mixture, tamp with dirt.

Don’t leave too long, will absorb moisture and reduce effectiveness.

Question 29

Stump removal

Answer 29

Stumps are measure 12 to 18 inches above ground. Diameter rounded up to 1/2 foot.

Question 30

Stump removal explosive amounts

Answer 30

1lb per 1’ diameter for dead stumps
2lb per 1’ diameter for live stumps
If completer tree is being removed then 3 lbs per 1’ diameter

Question 31

Stump removal depths

Answer 31

Lateral tree, stump radius

Taproot tree, stump diameter