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Calc and Place Study Guide > Timber (Chapter 8) > Flashcards

Timber (Chapter 8) Flashcards

1
Q
  1. What is the placement of ring charge?
A

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

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2
Q
  1. How big should charges be on external method?
A

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

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3
Q
  1. In order to achieve maximum charge to target, you must do what?
A

Remove the bark or notch tree to match dimensions of charge

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4
Q
  1. What is the formula used for ring charge?
A

Used for external formula P=D2/40

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5
Q
  1. How many holes are used for internal charge?
A

Trees up to 18” diameter = 1 hole

Larger than 18” diameter = 2 hole

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6
Q
  1. What is the two types of hole placement and what are they?
A

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

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7
Q
  1. What types of explosive used for internal?
A

M1 dynamite, plastic and Sheet explosives

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8
Q
  1. What are some considerations when cutting timber?
A

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

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9
Q
  1. What is abatis charge and how to place?
A

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

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10
Q
  1. What is the formula for internal charges?
A

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

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11
Q
  1. What types of explosive used for ring?
A

plastic and sheet explosives

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12
Q
  1. How thick should ring charge be?
A

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

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

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

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14
Q
  1. What are the considerations for an abatis?
A

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

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15
Q
  1. What is the measurement of holes that drilled into timber?
A

2” diameter, and 2/3 deep in timber

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16
Q
  1. What is the formula used for Abatis?
A

P=D^2/50

17
Q
  1. What types of explosives used for Timber?
A

Internal, External, and Ring

18
Q
  1. What is the formula used for external?
A

P=D^2/40

19
Q
  1. What types of explosive used for external?
A

For circular, plastic and sheet explosives

For dimensional: TNT, plastic and sheet explosives

Calc and Place Study Guide (15 decks)

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