Dirt

Question 1

What are the characteristics of an effective crater?

Answer 1

Too wide for track vehicles to span

Too steepsided for vehicles to pass

Question 2

At least how many passes must a modern tank need to traverse a crater for the crater to be effective?

Answer 2

4

Question 3

What are the borehole depths and amounts of explosives per hole for a Hasty Crater?

Answer 3

5 feet deep

At least 50 lbs of explosives per hole

Question 4

What is the spacing between Hasty Crater boreholes?

Answer 4

5 feet on center

Question 5

How wide are the blowouts of a Hasty Crater?

Answer 5

Approximately 8 feet beyond the end boreholes

Question 6

What are the characteristics of a completed Hasty Crater?

Answer 6

V-shaped crater, 6-7 feet deep, 20-25 feet wide, side slope of 25-35 degrees

Question 7

What is the Hasty Crater formula?

Answer 7

N = (L-16) / 5 + 1

Round up to the next whole number

Question 8

What are the borehole depths and amounts of explosives per hole for a Deliberate Crater?

Answer 8

5 feet deep holes with 40 lbs of explosives

7 feet deep holes with 80 lbs of explosives

Question 9

What is the spacing between Deliberate Crater boreholes?

Answer 9

5 feet on center

Question 10

What are the rules for selecting depths of Deliberate Crater boreholes?

Answer 10

End boreholes are 7 feet deep

No two 5 feet deep boreholes side by side

Center borehole is 7 feet deep

Question 11

What are the characteristics of a completed Deliberate Crater?

Answer 11

V-shaped crater, 7-8 feet deep, 25-30 feet wide, side slope of 37 degrees

Modern tanks require an average of 8 attempts to traverse

Question 12

What is the Deliberate Crater formula?

Answer 12

N = (L-16) / 5 + 1

Round up to the next whole number

Question 13

When there is an even number of total boreholes for a Deliberate Crater, how many more 7 feet boreholes are there than 5 feet boreholes?

Answer 13

2

Question 14

What are the borehole depths and amounts of explosives per hole for a Relieved Face Crater?

Answer 14

Friendly row boreholes are 5 feet deep with 40 lbs of explosives

Enemy row boreholes are 4 feet deep with 30 lbs of explosives

Question 15

How much delay should there be between the detonation of friendly and enemy row boreholes in a Relieved Face Crater?

Answer 15

0.5 to 1.5 seconds

Question 16

Which row is fired first on a Relieved Face Crater?

Answer 16

Enemy row

Question 17

How wide are the blowouts of a Deliberate Crater?

Answer 17

Approximately 8 feet beyond the end boreholes

Question 18

What is the spacing between rows for a Relieved Face Crater on dirt or gravel roads?

Answer 18

8 feet apart

Question 19

What is the spacing between rows for a Relieved Face Crater on hard surface roads?

Answer 19

12 feet apart

Question 20

What is the spacing between boreholes in a Relieved Face Crater?

Answer 20

7 feet

Question 21

How wide are the blowouts of a Relieved Face Crater?

Answer 21

Approximately 5 feet beyond the end boreholes

Question 22

What are the characteristics of a completed Relieved Face Crater?

Answer 22

Trapezoidal-shaped crater, 7-8 feet deep, 25-30 feet wide, unequal side slopes

Question 23

What is the formula for a Relieved Face Crater?

Answer 23

N = (L-10) / 7 - 1

Round up to the next whole number

Question 24

How many enemy boreholes will there be relative to friendly boreholes in a Relieved Face Crater?

Answer 24

One less enemy borehole

Question 25

How much explosives should you use to breach hard surface pavement for manual breaching?

Answer 25

1 lb of explosives per 2” of pavement

Question 26

How much should you tamp a charge to breach hard surface pavement for manual breaching?

Answer 26

Twice the breaching radius

Question 27

What is an Expedient Cratering Charge composed of?

Answer 27

Ammonium nitrate fertilizer and fuel oil (motor oil, diesel, gas)

Question 29

How much nitrogen must the fertilizer in an Expedient Cratering Charge contain?

Answer 29

33 1/3% or higher

Question 30

What is the fuel mix ratio for an Expedient Cratering Charge?

Answer 30

1 quart per 25 lbs of fertilizer

Question 31

How many times should you prime an Expedient Cratering Charge?

Answer 31

Dual priming is recommended

Question 32

What can happen if you leave an Expedient Cratering Charge in the borehole for a long period of time?

Answer 32

It will accumulate moisture and reduce its effectiveness

Question 33

How long do you soak the fertilizer in fuel for an Expedient Cratering Charge?

Answer 33

1 hour

Question 34

How are stumps measured for Land Clearing Charges?

Answer 34

12-18 inches a over ground level Diameter is rounded up to the next 1/2 foot

Question 35

How much explosives are used for Stump Removal based on the diameter of the stump?

Answer 35

1 lb of explosives per 1 foot of diameter for dead stumps 2 lbs of explosives per 1 foot of diameter for live stumps 3 lbs of explosives per 1 foot of diameter for complete trees

Question 36

What are the two types of trees to consider for Stump Blasting Charges?

Answer 36

Lateral and taproot

Question 37

What is the hole depth of a Stump Blasting Charge for a lateral tree?

Answer 37

Stump radius

Question 38

What is the hole depth of a Stump Blasting Charge for a taproot tree?

Answer 38

Stump diameter