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Calc and Place > Military Explosives (Chapter 1) > Flashcards

Military Explosives (Chapter 1) Flashcards

1
Q
  1. What is R.E factor?
A

R.E stands for Relative Effectiveness which represents a measurement of an explosive’s power compared to TNT

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2
Q
  1. What are the four common types of Block demolition charge?
A

TNT, M112, M1 DYNAMITE, AND 40lb Cratering charge

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3
Q
  1. What is block demolition charge?
A

Prepackaged HE (high explosive) Charges that are used for general purpose task (cutting, breaching, and cratering)

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4
Q
  1. Describe TNT
A

Trinitrotulene (TNT), is the baseline to rate all military explosives using the R.E Factor

Most often composite form of H6, Comp B, Comp B4

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5
Q
  1. How is TNT packaged?
A

¼, ½, and 1 lb blocks

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6
Q
  1. What are the advantage of TNT?
A

Effective for all types of demolition work except steel cutting

Insensitive to shock or friction

Convenient size and shape for charge construction

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7
Q
  1. What is the disadvantage of TNT?
A

Cannot be molded and is difficult to use on irregular shaped targets

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8
Q
  1. What are the composition explosive?
A

Composition A
Composition B
Composition H6
Composition C4

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9
Q
  1. What is effective temperatures of C4?
A

Between -70 F and 170 F

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10
Q
  1. What happens to C4 in colder temperatures?
A

Loses its plasticity

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11
Q
  1. What are the components of C4?
A

90% RDX
9% NON-EXPLOSIVE PLASTICIZER
1% Taggant (odorizer)

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12
Q
  1. What is M112 Block demolition charge?
A

Primary block demolition charge in U.S. Army. Ideally suited for irregularly shaped targets.It can be “CUT” and “MOLDED”. Primarily used for cutting and breaching because of high RE.

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13
Q
  1. What does M112 consist of?
A

1 ¼ lb of composition C4

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14
Q
  1. What is R.E factor of Dynamite?
A

0.92

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15
Q
  1. Is there any difference between commercial dynamite and military dynamite?
A

The strength of military dynamite is 60% strength of commercial dynamite.

Commercial is made of nitroglycerin, military is 75% RDX, 15% TNT, 10% Desensitizers and plasticizers

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16
Q
  1. What does M1 dynamite consist of?
A

75% RDX
15% TNT
10% Desensitizers and plasticizers

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17
Q
  1. How M1 dynamite issued?
A

Issued in ½ lb cylindrical cartridges measuring 1 ¼” x 8”

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18
Q
  1. What is primary used of M1?
A

Stump removal, military construction, quarrying, ditching, and service demolition work

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19
Q
  1. What is and advantage of M1?
A

Reliable underwater for up to 24 hours

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20
Q
  1. What is disadvantage of M1?
A

Not effective as cutting or breaching charge

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21
Q
  1. What is R.E factor of composition H6?
A

1.33

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22
Q
  1. What is composition H6 used for? What is it made of?
A

Used in cratering charges, general purpose bombs, MOAB (Massive Ordnance air blast), Naval torpedoes, and Land mines

44% RDX
29.5% TNT
21% AL
5% wax
0.5% Calcium Chloride
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23
Q
  1. What does MOAB stand for?
A

Massive Ordnance Air Blast

24
Q
  1. What is purpose of 40lb Cratering charge?
A

Primarily used for Crater and Ditching operation, also effective at destroying buildings, fortifications, and bridge abatements

25
Q
  1. What is a 40lb cratering charge made of? How does 40lb cratering charge issued?
A

30 lbs Ammonium Nitrate
10 lbs TNT

Issued in a watertight, cylindrical metal container

26
Q
  1. How does 40lb cratering charge prepared?
A

Prime Charge with 2 blocks M112 on both side

27
Q
  1. What are Sheet explosives?
A

Explosive packaged in a roll form that are adaptable for demolishing targets that require flexible explosives. Can be cut to the length and shape as you desire. M186 and C2 Primasheet

28
Q
  1. What are the two common types of sheet explosives?
A

M186 ROLL, and C2 PRIMASHEET

29
Q
  1. How is M186 ROLL issued? And what is it ideal for?
A

50’ roll form with plastic spool, issued with 15 M8 blasting cap holders

Ideal for longer targets because it can be cut to exact lengths

30
Q
  1. What is the thickness of M186?
A

C6 Thickness

Means 6 grams of explosive per square inch

31
Q
  1. How much explosive M186 contains per foot?
A

½ LB of Explosive

32
Q
  1. What is R.E factor of M186?
33
Q
  1. How much explosive C2 Primasheet contains per foot? What does C2 thickness indicate?
A

½ LB of Explosive

C2 thickness is 2 grams per square inch

34
Q
  1. C2 primasheet is also known as what?
35
Q
  1. What is advantage of C2 Primasheet?
A

Easily cut to any desired shape and lengths

Bullet impact insensitive

36
Q
  1. What is R.E factor of C2 Primasheet?
37
Q
  1. What are the two types of Shaped demolition charges?
A

15LB M2A4 Shaped demolition charge

40lb M3A1 Shaped demolition charge

38
Q
  1. What is the primary use of shaped demolition charge?
A

Used for boring holes in the earth, metal, masonry, concrete, and paved or unpaved roads

39
Q
  1. What is the disadvantage of shaped demolition charge?
A

Not effective underwater

Requires standoff from the target material to achieve maximum effectiveness of Jet

40
Q
  1. What is the primary use of Composition A? What are the Comp A blends?
A

Primarily used as boosters for composition B

A3 is 91% RDX, 9% wax
A4 is 97% RDX, 3% wax
A5 is 98.5% RDX, 1.5% wax

41
Q
  1. What is the primary use of Composition B? What are the Comp B blends?
A

Used as filler in projectiles (mortars) and shaped charges

Comp B is 60% RDX, 30% TNT, 10% wax
Comp B4 is 60% RDX, 39.5% TNT, 0.5% Calcium Silicate

42
Q
  1. What is the R.E factor of Composition A and B?
43
Q
  1. How do you calculate NEW (Net explosive weight)?
A

Quantity X Package weight X R.E factor = weight of TNT

44
Q
  1. Describe 15LB M2A4 shaped demolition charge
A

Contains 0.11 LB composition A3 booster with 9.4 lb main charge of composition B

Issued with a fiberglass composite 6” standoff
Cavity liner is a cone of glass

45
Q
  1. What is the R.E factor of both 15lb M2A4 and 40lb M3A1?
46
Q
  1. Describe 40LB M3A Shaped demolition charge?
A

Contains 0.11 LB composition A3 booster with 29 ½ main charge of composition B
Issued with a metal tripod providing 15” of standoff
Cavity liner is a cone of metal

47
Q
  1. What is M1A2 Bangalore torpedo demolition kit?
A

A tube shaped explosive charge used primarily for clearing paths through wire obstacles and heavy undergrowth

48
Q
  1. What is component of M1A2 Bangalore torpedo demolition kit?
A

10 Tube assembles, 10 connecting sleeves and 1 nose sleeve

49
Q
  1. What is composition of each M1A2 Bangalore torpedo tube?
A

Each tube is 5 feet long and contains 10 ½ lb composition B4

Each tube has a 4” (1/2 lb) comp A3 booster at both ends of each tube

50
Q
  1. What is the R.E factor of M1A2 bangalore?
51
Q
  1. What is AN?
A

Ammonium Nitrate (AN),

52
Q
  1. What is the R.E factor of AN?
A

0.42 least sensitive military explosive

53
Q
  1. What is the disadvantage of AN?
A

Requires a booster charge
Not suitable for cutting or breaching because its low detonation velocity
Not suitable for underwater unless in waterproof container* Extremely hygroscopic (Absorbs Humidity)*

54
Q

What is C2 primasheet made of?

A

63% PETN

37% plasticizer

54
Q

What are shaped demolition charges?

A

Cylindrical blocks of HE with comical cavities on one end that direct the lining material into a narrow jet to penetrate specified target material.

55
Q

Where do you initiate a shape charge?

A

Exact rear center

Calc and Place (20 decks)

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