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Calc and Place Study Guide > Dirt Cratering (Chapter 12) > Flashcards

Dirt Cratering (Chapter 12) Flashcards

1
Q
  1. What is explosive requirement for Dead stumps?
A

1lb of explosive is used per 1’ of diameter

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2
Q
  1. What is the spacing between deliberate crater boreholes?
A

Same as hasty crater

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3
Q
  1. An expedient cratering charge should prime with what
A

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

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4
Q
  1. What is formula to calculate relieved face crater?
A

N= (L-10/7)+1

* calculate number of charges for friendly row of boreholes*

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5
Q
  1. What is characteristics of deliberate crater?
A

V shaped, 7-8 feet deep & 25-30 wide with 37 degree slope

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6
Q
  1. What is measurement requirement for end of deliberate crater?
A

End boreholes are 7’ deep

No two 5’ holes sides by sides

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7
Q
  1. What is explosive requirement for live stumps?
A

2bls of explosive is used per 1’ of diameter

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8
Q
  1. What is measurement and explosive requirement of enemy row?
A

4’ deep with 30lbs explosive

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9
Q
  1. How to measure stump removal?
A

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

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10
Q
  1. What is the spacing between hasty crater boreholes?
A

From center to center 5’ between boreholes

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11
Q
  1. An effective craters takes _______ allowing time to employ AT weapon
A

4 or more passes

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12
Q
  1. How to improve craters?
A

By digging face vertically on friendly side, mining, and any other means to further delay the ENY

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13
Q
  1. What is characteristics of hasty crater?
A

V shaped, 6-7 feet deep & 20-25 wide with 25-35 degree side slope

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14
Q
  1. What is fuel oil requirement for fertilizer?
A

1 quart per 25lbs of fertilizer

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15
Q
  1. What is minimum weight of explosive used in hasty craters?
A

At minimum 50lbs of explosive

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16
Q
  1. To construct deliberate crater, which row will be fired first?
A

Enemy row

17
Q
  1. For breaching hard surface pavement, use how many pound of explosives for pavement?
A

1 pound for every 2 inches of pavement and tamp charge twice the thickness of the pavement

18
Q
  1. What is measurement of deliberate crater boreholes?
A

A combination of 5’ and 7’ deep

19
Q
  1. What is the placement of row when constructing relieved face crater?
A

On Dirt or Gravel roads: 8’ apart

On Hard surface road: 12’ apart

20
Q
  1. What is explosive requirement for complete tree?
A

3lbs of explosive is used per 1’ of diameter

21
Q
  1. How much nitrogen must be contained in Ammonium nitrate fertilizer?
A

33 1/3% of nitrogen

22
Q
  1. What is hasty crater blowout distance?
A

Approximately 8’

23
Q
  1. What are the three method of boulder removal?
A

Snake-hole, mudcapping, and block-hole method

24
Q
  1. What is the characteristics of relieved face crater?
A

Trapezoidal shape, 7-8 deep and 25-30 feet wide with unequal side slopes

25
Q
  1. For hasty crater, what is average traverse attempts of modern tanks?
A

Average of 4 attempts

26
Q
  1. What is taproot hole depth equivalent to?
A

Equal to breaching radius

27
Q
  1. What is measurement and explosive requirement of friendly row?
A

5’ deep with 40lbs explosive

28
Q
  1. For relieved face crater, how would you place first borehole?
A

First borehole placed 5’ in from desired edge of crater

29
Q
  1. What is the spacing between relieved face crater boreholes?
A

From center to center 7’ between boreholes

30
Q
  1. What is lateral hole depth equivalent to?
A

Equal to breaching radius, place long side of root

31
Q
  1. What is minimum explosive requirement of deliberate crater boreholes?
A

5’ holes will have 40 lbs of explosive

7’ holes will have 80 lbs of explosive

32
Q
  1. What is formula of deliberate crater?
A

N = (L-16/5) +1

33
Q
  1. For hasty crater, what is minimum depth of boreholes?
A

At least 5’ deep

34
Q
  1. What is the requirement of effective craters?
A

Must be too wide for track vehicles to span & too steepsided for vehicles to pass

35
Q
  1. For deliberate crater, what is average traverse attempts of modern tanks?
A

Average of 8 attempts

36
Q
  1. What is the formula for hasty crater?
A

N= (L-16 / 5)+1

Round up any fractional number of holes to next higher number

37
Q
  1. What are the two types of row requires to construct relieved face crater?
A

Friendly row and Enemy row

38
Q
  1. How to calculate number of enemy row boreholes?
A

Number of friendly row borehole – 1 hole

39
Q
  1. What is deliberate crater blowout distance?
A

Approximately 8’

Calc and Place Study Guide (15 decks)

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