Timber (Chapter 8)

Question 1

16. Where should you prime a ring charge?

Answer 1

Two opposing places

Question 2

11. How big should charges be on external method?

Answer 2

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 contact, 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=D^2/40

Question 5

7. How many holes are used for an internal charge?

Answer 5

Trees up to 18” diameter = 1 hole

Larger than 18” diameter = 2 hole

Question 6

8. Name and describe the two types of hole placement

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 explosives are used for internal?

Answer 7

Dynamite, plastic and sheet explosives

Question 8

5. What are some considerations when cutting timber?

Answer 8

Wind and Lean
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 an abatis?

Answer 9

Fallen trees partially attached to their stumps, used as an obstacle

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 explosives are used for ring?

Answer 11

Plastic and sheet explosives

Question 12

15. How big should ring charge be?

Answer 12

The explosive band should be as wide as possible

At least ½” thick for trees up to AND INCLUDING 15”

1” thick for medium and large trees up to 30”

Add 15% to circumference when constructing the charge

Question 13

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

Answer 13

Add 1 lb kicker charge, optimally 2/3 up tree opposite of the main charge. Fire simultaneously with main 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 are drilled into timber for internal charges?

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
(Dynamite, plastic and sheet)

External
(Circular: Plastic and sheet; Dimensional: TNT, plastic, and sheet)

Ring
(Plastic and Sheet)

Question 18

10. What is the formula used for external?

Answer 18

P=D^2/40

Question 19

3. What types of explosives are used for external?

Answer 19

Circular, plastic and sheet explosives

Dimensional: TNT, plastic, and sheet explosives

Question 20

How should you attack timber with a charge?

Answer 20

Attack the least dimension

Question 21

What are the most critical facts for determining direction of fall?

Answer 21

Wind and Lean

Question 22

What should you do after placing explosive in hole for internal charges?

Answer 22

Cap bore holes with mud or clay using a non sparking tool

Question 23

What should you do to the circumference when constructing a ring charge?

Answer 23

Add 15%

Question 24

Two types of ring charges

Answer 24

Dimensional

Circular

Question 25

Where should abatis charges be place?

Answer 25

5’ above ground level

Use kicker charges when necessary

Question 26

How long should an abatis be?

Answer 26

At least 75 meters in depth

Question 27

How big should abatis trees be?

Answer 27

At least 2 ft in diameter

Question 28

How far apart should abatis tree be?

Answer 28

3-5 meters apart

Question 29

Which direction should the felled trees of an abatis be facing?

Answer 29

45 degrees toward enemy approach

Question 30

What are the procedures for detonating abatis charges?

Answer 30

Detonate one side of the road, allow delay and then the other side

Avoids deflecting

(Enhance with wire, mines, booby traps)