Dirt Cratering (Chapter 12) Flashcards
- What is explosive requirement for Dead stumps?
1lb of explosive is used per 1’ of diameter
- What is the spacing between deliberate crater boreholes?
Same as hasty crater
- An expedient cratering charge should prime with what
Prime with 1lb of TNT (dual priming is recommended)
- What is formula to calculate relieved face crater?
N= (L-10/7)+1
* calculate number of charges for friendly row of boreholes*
- What is characteristics of deliberate crater?
V shaped, 7-8 feet deep & 25-30 wide with 37 degree slope
- What is measurement requirement for end of deliberate crater?
End boreholes are 7’ deep
No two 5’ holes sides by sides
- What is explosive requirement for live stumps?
2bls of explosive is used per 1’ of diameter
- What is measurement and explosive requirement of enemy row?
4’ deep with 30lbs explosive
- How to measure stump removal?
Stumps are measured 12-18” above ground level then diameter is rounded to next higher ½ foot
- What is the spacing between hasty crater boreholes?
From center to center 5’ between boreholes
- An effective craters takes _______ allowing time to employ AT weapon
4 or more passes
- How to improve craters?
By digging face vertically on friendly side, mining, and any other means to further delay the ENY
- What is characteristics of hasty crater?
V shaped, 6-7 feet deep & 20-25 wide with 25-35 degree side slope
- What is fuel oil requirement for fertilizer?
1 quart per 25lbs of fertilizer
- What is minimum weight of explosive used in hasty craters?
At minimum 50lbs of explosive
- To construct deliberate crater, which row will be fired first?
Enemy row
- For breaching hard surface pavement, use how many pound of explosives for pavement?
1 pound for every 2 inches of pavement and tamp charge twice the thickness of the pavement
- What is measurement of deliberate crater boreholes?
A combination of 5’ and 7’ deep
- What is the placement of row when constructing relieved face crater?
On Dirt or Gravel roads: 8’ apart
On Hard surface road: 12’ apart
- What is explosive requirement for complete tree?
3lbs of explosive is used per 1’ of diameter
- How much nitrogen must be contained in Ammonium nitrate fertilizer?
33 1/3% of nitrogen
- What is hasty crater blowout distance?
Approximately 8’
- What are the three method of boulder removal?
Snake-hole, mudcapping, and block-hole method
- What is the characteristics of relieved face crater?
Trapezoidal shape, 7-8 deep and 25-30 feet wide with unequal side slopes
- For hasty crater, what is average traverse attempts of modern tanks?
Average of 4 attempts
- What is taproot hole depth equivalent to?
Equal to breaching radius
- What is measurement and explosive requirement of friendly row?
5’ deep with 40lbs explosive
- For relieved face crater, how would you place first borehole?
First borehole placed 5’ in from desired edge of crater
- What is the spacing between relieved face crater boreholes?
From center to center 7’ between boreholes
- What is lateral hole depth equivalent to?
Equal to breaching radius, place long side of root
- What is minimum explosive requirement of deliberate crater boreholes?
5’ holes will have 40 lbs of explosive
7’ holes will have 80 lbs of explosive
- What is formula of deliberate crater?
N = (L-16/5) +1
- For hasty crater, what is minimum depth of boreholes?
At least 5’ deep
- What is the requirement of effective craters?
Must be too wide for track vehicles to span & too steepsided for vehicles to pass
- For deliberate crater, what is average traverse attempts of modern tanks?
Average of 8 attempts
- What is the formula for hasty crater?
N= (L-16 / 5)+1
Round up any fractional number of holes to next higher number
- What are the two types of row requires to construct relieved face crater?
Friendly row and Enemy row
- How to calculate number of enemy row boreholes?
Number of friendly row borehole – 1 hole
- What is deliberate crater blowout distance?
Approximately 8’
