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Calc and Place > Dirt > Flashcards

Dirt Flashcards

1
Q

What are the characteristics of an effective crater?

A

Too wide for track vehicles to span

Too steepsided for vehicles to pass

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2
Q

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

A

4

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3
Q

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

A

5 feet deep

At least 50 lbs of explosives per hole

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4
Q

What is the spacing between Hasty Crater boreholes?

A

5 feet on center

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5
Q

How wide are the blowouts of a Hasty Crater?

A

Approximately 8 feet beyond the end boreholes

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6
Q

What are the characteristics of a completed Hasty Crater?

A

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

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7
Q

What is the Hasty Crater formula?

A

N = (L-16) / 5 + 1

Round up to the next whole number

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8
Q

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

A

5 feet deep holes with 40 lbs of explosives

7 feet deep holes with 80 lbs of explosives

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9
Q

What is the spacing between Deliberate Crater boreholes?

A

5 feet on center

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10
Q

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

A

End boreholes are 7 feet deep

No two 5 feet deep boreholes side by side

Center borehole is 7 feet deep

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11
Q

What are the characteristics of a completed Deliberate Crater?

A

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

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12
Q

What is the Deliberate Crater formula?

A

N = (L-16) / 5 + 1

Round up to the next whole number

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13
Q

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?

A

2

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14
Q

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

A

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

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

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15
Q

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

A

0.5 to 1.5 seconds

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16
Q

Which row is fired first on a Relieved Face Crater?

A

Enemy row

17
Q

How wide are the blowouts of a Deliberate Crater?

A

Approximately 8 feet beyond the end boreholes

18
Q

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

A

8 feet apart

19
Q

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

A

12 feet apart

20
Q

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

A

7 feet

21
Q

How wide are the blowouts of a Relieved Face Crater?

A

Approximately 5 feet beyond the end boreholes

22
Q

What are the characteristics of a completed Relieved Face Crater?

A

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

23
Q

What is the formula for a Relieved Face Crater?

A

N = (L-10) / 7 - 1

Round up to the next whole number

24
Q

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

A

One less enemy borehole

25
Q

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

A

1 lb of explosives per 2” of pavement

26
Q

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

A

Twice the breaching radius

27
Q

What is an Expedient Cratering Charge composed of?

A

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

29
Q

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

A

33 1/3% or higher

30
Q

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

A

1 quart per 25 lbs of fertilizer

31
Q

How many times should you prime an Expedient Cratering Charge?

A

Dual priming is recommended

32
Q

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

A

It will accumulate moisture and reduce its effectiveness

33
Q

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

A

1 hour

34
Q

How are stumps measured for Land Clearing Charges?

A

12-18 inches a over ground level

Diameter is rounded up to the next 1/2 foot

35
Q

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

A

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

36
Q

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

A

Lateral and taproot

37
Q

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

A

Stump radius

38
Q

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

A

Stump diameter

Calc and Place (5 decks)

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