Flashcards in Dirt Cratering (Chapter 12) Deck (55)

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1

## 34. What is explosive requirement for Dead stumps?

### 1lb of explosive is used per 1’ of diameter

2

## 13. What is the spacing between deliberate crater boreholes?

###
5 feet between boreholes, center to center

Same as hasty crater

3

## 32. An expedient cratering charge should be primed with what?

### Prime with 1lb of TNT (dual priming is recommended)

4

## 27. What is formula to calculate number of boreholes for a relieved face crater?

###
N_fr = ((L-10) / 7) + 1

Calculates number of charges for friendly row of boreholes.

Round any fractional numbers to next higher number

N_er = N_fr - 1

5

## 14. What is characteristics of deliberate crater?

###
V shaped

7-8 feet deep

25-30 wide

37 degree slope

6

## 17. What is measurement requirement for boreholes at the end of a deliberate crater?

###
End boreholes are 7’ deep

7

## 35. What is explosive requirement for live stumps?

### 2bls of explosive is used per 1’ of diameter

8

## 21. What is measurement and explosive requirement for an enemy row in a relieved face crater?

###
4’ deep

30 lbs explosive

9

## 33. How do you measure for stump removal?

### Stumps are measured 12-18” above ground level then diameter is rounded to next higher ½ foot

10

## 6. What is the spacing between hasty crater boreholes?

### From center to center 5’ between boreholes

11

## 2. An effective craters takes _______ allowing time to employ anti-tank weapons

### 4 or more passes

12

## 3. How do you improve craters?

###
Digging face vertically on friendly side

Mining

Filling with water

Any other means to further delay the enemy

13

## 9. What are the geometric characteristics of hasty crater?

###
V shaped

6-7 feet deep

20-25 wide

25-35 degree side slope

14

## 31. What is the fuel oil requirement to mix with fertilizer?

### 1 quart per 25lbs of fertilizer

15

## 5. What is minimum weight of explosive per borehole used in hasty craters?

###
At minimum 50 lbs of explosive per borehole

***DOES NOT MATTER WHICH EXPLOSIVE***

Do not convert using RE factor, only divide by pounds per unit

16

## 22. To construct relieved face crater, which row will be fired first?

###
Enemy row

1/2 to 1 1/2 second delay

17

## 29. For breaching hard surface pavement, how many pounds of explosives should be used?

###
1 pound for every 2 inches of pavement

Tamp charge twice the breaching radius (thickness of the pavement) (2 x Br)

18

## 15. What is depth of deliberate crater boreholes?

### A combination of 5’ and 7’ deep

19

## 24. What is the placement/spacing between friendly and enemy rows when constructing a relieved face crater?

###
On Dirt or Gravel roads: 8 feet apart

On Hard surface road: 12 feet apart

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## 36. What is explosive requirement for complete tree?

### 3lbs of explosive is used per 1’ of diameter

21

## 30. How much nitrogen must be contained in Ammonium nitrate fertilizer?

### 33 1/3% of nitrogen

22

## 8. What is hasty crater blowout distance?

### Approximately 8 feet beyond the end boreholes

23

## 39. What are the three methods of boulder removal?

### Snake-hole, mudcapping, and block-hole method

24

## 26. What is the shape/characteristics of a relieved face crater?

###
Trapezoidal shape

7-8 deep

25-30 feet wide

Unequal side slopes

25

## 7. For hasty crater, what is average traverse attempts of modern tanks?

### Average of 4 attempts

26

## 37. What is taproot hole depth equivalent to?

### Equal to stump diameter

27

## 20. What is measurement and explosive requirement are a friendly row in a relieved face crater?

###
5’ deep

40 lbs explosive

28

## 25. For relieved face crater, where would you place first borehole?

### 5 feet in from the desired edge of the crater

29

## 23. What is the spacing between relieved face crater boreholes?

### 7 feet between boreholes, center to center

30