C&P Timber Charges

Question 1

What are the types of timber charges?

Answer 1

Internal

External

Ring

Abatis

Question 2

What are the 2 most critical factors when determining direction of fall?

Where do you always attack?

Answer 2

Wind and lean

Least dimensions

Question 3

Internal formula

External/ ring formula

Abatis formula

Answer 3

P=d2/ 250

P= d2/ 40

P= d2/ 50

Question 4

Rules for internal

Answer 4

Trees 18” d use 1 hole

Trees greater than 18” d use 2 holes

Holes should be 2” d and 2/3 deep

Efficient means internal

Question 5

Rules for external

Answer 5

Charges should be rectangular 1-2” thick twice as wide than high

Circular timber charge should cover 1/2 the circumfrance

To influence direction of fall use 1 lb kicker 2/3 up tree opposite of main charge

Quickly means external

Question 6

Rules for ring charge

Answer 6

Explosive band should be as wide as possible

At least 1/2” thick for trees up to 15” thick

1” thick for trees up to 30” thick

Question 7

Rules for abatis

Answer 7

Charges placed 5’ above ground level

Use kicker charges when necessary

Ensure obstacles at least 75 meters in depth

Diameter of trees should be at least 2’