Timber Flashcards
1
Q
Two most critical factors for determining direction of fall?
A
Lean and wind.
2
Q
When destroying dimensional lumber, attack the ____ dimension.
A
Least
3
Q
Internal formula
A
P(lbs of TNT)= D^2/250
4
Q
Work Efficient
A
Internal charges, uses least amount of explosive.
5
Q
Six step problem solving format
A
- Gather all critical data
- Calculate for TNT
- Divide by RE factor of explosive used
- Divide by package weight and round up to next whole number
- Number of charges
- Total quantity of explosive
Multiply step 4 by step 5
6
Q
External formula
A
P=D^2/40
7
Q
Work quickly
A
External charges, fast placement, but more N.E.W.
8
Q
When to drill 1 hole vs 2 holes for internal charges
A
Up to 18” one hole
Greater than 18” two holes
9
Q
Formula for ring charge
A
Use external formula
10
Q
Ring charge thicknesses
A
Up to and including 15” - 1/2” thick
15” to 30” - 1” thick
Prime charge in two opposing places
11
Q
Abatis formula
A
P=D^2/50
12
Q
Abatis depth
A
At least 75m in depth
Trees at least 2’ diameter
