Timber (Chapter 8)

Question 1

16. What is the placement of ring charge?

Answer 1

Prime charge in two opposing places, and explosive band should be as wide as possible

Question 2

11. How big should charges be on external method?

Answer 2

Should be in rectangular, 1-2” Thick and twice as wide as they are high
On circular timber, charge should cover at least ½ the circumference

Question 3

12. In order to achieve maximum charge to target, you must do what?

Answer 3

Remove the bark or notch tree to match dimensions of charge

Question 4

14. What is the formula used for ring charge?

Answer 4

Used for external formula P=D2/40

Question 5

7. How many holes are used for internal charge?

Answer 5

Trees up to 18” diameter = 1 hole

Larger than 18” diameter = 2 hole

Question 6

8. What is the two types of hole placement and what are they?

Answer 6

a) Dimensional
Holes are side by side and should face direction of fall

b) Circular
Holes are at right angles and the direction of fall is in between holes

Question 7

2. What types of explosive used for internal?

Answer 7

M1 dynamite, plastic and Sheet explosives

Question 8

5. What are some considerations when cutting timber?

Answer 8

Wind & Lean are the most critical factors for determining direction of fall
Always attack the least dimension
For unknown types make a test shot to determine optimal size of the charge

Question 9

18. What is abatis charge and how to place?

Answer 9

Used as an obstacle, charges placed 5’ above ground level

Question 10

6. What is the formula for internal charges?

Answer 10

P (lbs of TNT) = D^2 (Diameter) /250

Question 11

4. What types of explosive used for ring?

Answer 11

plastic and sheet explosives

Question 12

15. How thick should ring charge be?

Answer 12

At least ½” thick for trees up to 15” (include 15”)
1” thick up to 30” tree
Add 15-25% when constructing the charge

Question 13

13. How to influence the direction of fall while using external method?

Answer 13

Add 1 lb kicker charge, optimally 2/3 up tree opposite of the man charge.

Question 14

19. What are the considerations for an abatis?

Answer 14

Ensure obstacle is at least 75 meters in depth
Fall trees 45 degrees towards ENY
Detonate one side of road, allow delay then other side of road IOT avoid deflecting

Question 15

9. What is the measurement of holes that drilled into timber?

Answer 15

2” diameter, and 2/3 deep in timber

Question 16

17. What is the formula used for Abatis?

Answer 16

P=D^2/50

Question 17

1. What types of explosives used for Timber?

Answer 17

Internal, External, and Ring

Question 18

10. What is the formula used for external?

Answer 18

P=D^2/40

Question 19

3. What types of explosive used for external?

Answer 19

For circular, plastic and sheet explosives

For dimensional: TNT, plastic and sheet explosives