Timber

Question 1

What are the 3 formulas for all timber charges?

Answer 1

Internal: P=D^2/250
External: P=D^2/40
Abatis=P=D^2/50

P=lbs of TNT
D=diameter

Question 2

What are the 3 considerations when targeting timber?

Answer 2

• Wind and Lean when determining direction of fall
• For unknown types of trees make a test shot to determine optimal size of charge
• Always attack the least dimension

Question 3

What are the 3 types of timber explosives?

Answer 3

Internal, External and Ring

Question 4

What formula do you use for a Ring charge?

Answer 4

External: P=D^2/40

Question 5

What dimension do you want to attack on Dimensional timber charge?

Answer 5

Always attack the least dimension

Question 6

What should be the width and thickness of a ring charge on a tree that is 15” thick or less?

Answer 6

As wide as possible, at least 1/2” thick

Question 7

What should the width and thickness of a ring charge on a tree that is greater than 15” thick?

Answer 7

As wide as possible, at least 1” thick

Question 8

For an Abatis obstacle what is the desired minimum length?

Answer 8

Ensure obstacle is at least 75 meters in length

Question 9

Which direction should the fallen trees be facing?

Answer 9

3-5 meters apart and 45 degrees towards the enemy approach

Question 10

What is the most critical factor for determining direction of fall?

Answer 10

Wind and the way the tree is leaning

Question 11

How should holes in trees be drilled?

Answer 11

2” diameter, 2/3 deep

Question 12

How can you influence the direction of fall?

Answer 12

1lb kicker charge, optimally placed 2/3 up the tree opposite of the main charge. Fired at the same time as the main charge.

Question 13

What is the formula for an internal charge?

Answer 13

P=D^2/250

Question 14

Dimensional timber’s have how many sides?

Answer 14

4 sides

Question 15

How do you drill a circular timber if you have 2 holes?

Answer 15

90 degrees apart from each other with the desired direction of fall in between the 2 charges

Question 16

How many forms attachment do you need for an explosive/charge?

Answer 16

2 forms of attachment

Question 17

What formula do you use for Abatis?

Answer 17

P=D^2/50

Question 18

On an Abatis how high do you place the charges?

Answer 18

5 feet above the ground

Question 19

What is the minimum diameter for a tree when constructing an Abatis?

Answer 19

2 feet or 24 inches

Question 20

When detonating the explosives for an Abatis construction what is the order you do it in?

Answer 20

Detonate one side of the road, let all of the trees fall then detonate the other side of the road and allow the trees to fall.

Question 21

What does “most efficient/effective imply?

Answer 21

Internal charge, less explosives

Question 22

What does work quickly imply?

Answer 22

External charge, more explosives

Question 23

If time allows what do you want to do to prep the tree prior to emplacing charge?

Answer 23

Remove the bark

Question 24

How do you calculate for diameter?

Answer 24

Circumference / Pi = diameter

Question 25

What is the 6 step problem solving format?

Answer 25

1) all critical data
2) calculate for TNT (solve for P)
3) divide P/RE factor of explosives used
4) divide package weight and round up
5) determine # of targets
6) multiply # of targets by packages of explosives = total amount of explosives needed

Question 26

External charge should be what size and shape?

Answer 26

Rectangular, 1-2” thick and twice as wide as they are high.

Question 27

How do you calculate NEW for a block of explosive?

Answer 27

Qty x Package Weight x RE = Pounds of TNT