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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
26. What is a 40lb cratering charge made of? How does 40lb cratering charge issued?
30 lbs Ammonium Nitrate 10 lbs TNT Issued in a watertight, cylindrical metal container
26
27. How does 40lb cratering charge prepared?
Prime Charge with 2 blocks M112 on both side
27
28. What are Sheet explosives?
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
29. What are the two common types of sheet explosives?
M186 ROLL, and C2 PRIMASHEET
29
30. How is M186 ROLL issued? And what is it ideal for?
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
31. What is the thickness of M186?
C6 Thickness | Means 6 grams of explosive per square inch
31
34. How much explosive M186 contains per foot?
½ LB of Explosive
32
33. What is R.E factor of M186?
1.14
33
34. How much explosive C2 Primasheet contains per foot? What does C2 thickness indicate?
½ LB of Explosive C2 thickness is 2 grams per square inch
34
35. C2 primasheet is also known as what?
DETASHEET
35
36. What is advantage of C2 Primasheet?
Easily cut to any desired shape and lengths Bullet impact insensitive
36
37. What is R.E factor of C2 Primasheet?
1.14
37
38. What are the two types of Shaped demolition charges?
15LB M2A4 Shaped demolition charge 40lb M3A1 Shaped demolition charge
38
39. What is the primary use of shaped demolition charge?
Used for boring holes in the earth, metal, masonry, concrete, and paved or unpaved roads
39
40. What is the disadvantage of shaped demolition charge?
Not effective underwater Requires standoff from the target material to achieve maximum effectiveness of Jet
40
41. What is the primary use of Composition A? What are the Comp A blends?
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
42. What is the primary use of Composition B? What are the Comp B blends?
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
43. What is the R.E factor of Composition A and B?
1.35
43
44. How do you calculate NEW (Net explosive weight)?
Quantity X Package weight X R.E factor = weight of TNT
44
45. Describe 15LB M2A4 shaped demolition charge
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
46. What is the R.E factor of both 15lb M2A4 and 40lb M3A1?
1.17
46
47. Describe 40LB M3A Shaped demolition charge?
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
48. What is M1A2 Bangalore torpedo demolition kit?
A tube shaped explosive charge used primarily for clearing paths through wire obstacles and heavy undergrowth
48
49. What is component of M1A2 Bangalore torpedo demolition kit?
10 Tube assembles, 10 connecting sleeves and 1 nose sleeve
49
50. What is composition of each M1A2 Bangalore torpedo tube?
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
51. What is the R.E factor of M1A2 bangalore?
1.17
51
52. What is AN?
Ammonium Nitrate (AN),
52
53. What is the R.E factor of AN?
0.42 least sensitive military explosive
53
54. What is the disadvantage of AN?
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
What is C2 primasheet made of?
63% PETN | 37% plasticizer
54
What are shaped demolition charges?
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
Where do you initiate a shape charge?
Exact rear center

Calc and Place (20 decks)

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