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Bravo Course > Mortars Final > Flashcards

Mortars Final Flashcards

1
Q

Gun setting for min range

A

1511 mil and 0 charge

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2
Q

Traverse capabilities for 60mm

A

250 mil total

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3
Q

Difference between direct lay and direct alignment

A

Lay- gunner sees target

Alignment- FO observes target near gun target line

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4
Q

Most important position selection criteria

A

Mission accomplishment

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5
Q

60mm range
Min
Max
Handheld

A

Min-70m
Max-3490
Handheld-1340

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6
Q

Position selection factors

A 
Mission accomplishment 
Tactical situation 
Range 
Target area coverage 
survivability
Overhead and mask clearance
Surface conditions
Comms
Routes
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6
Q

Range criteria

A

Mortars should be positioned to cover 1/2 to 2/3 of MER

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8
Q

Traverse settings for the 120

A

136 mil from center
316 mil total with extension
5mil per turn

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9
Q

If FO can’t be with in 100m of fun, how close must he be to the left or right of the gun

A

100m left or right

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10
Q

What are the two ways a commander displaces guns

A 
On order
Predetermined event (phase line)
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11
Q

How many turns of traverse are allowed when boresigting

A

2 turns

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12
Q

3 main parts for mortar rounds

A

Fuze
Body
Tail fun with propulsion system assembly

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14
Q

Parallel formation definition

A

Mortars online, distance between mortars=burst diameter of HE round

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15
Q

Which end of the needle on M2 do you use to index azimuth

A

South seeking (black tip)

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16
Q

Burst radius for 120

A

75m

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17
Q

Difference between successive and alternative bounding

A

A- bounding element passes other element

S- bounding element gets online with other element

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18
Q

How do you determine total turns of traverse

A

60/81-10mil per turn

120-5mil per turn

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19
Q

Rules for traversing fire

A 
Width of target
Total turns of traverse
#of rounds 
# of intervals
#of turns per interval
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20
Q

M67 sight capabilities
Magnification
Field of view

A

Mag-4x

FOV-10 deg

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22
Q

What happens if water gets in the tube

A

Short rounds

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24
Q

Ranges for the 120

A

Min-200m

Max-7.2km

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25
Q

60 mm bipod designation

A

M170A1

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26
Q

Number of turns per interval

A

Total turns required divided by number of intervals

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27
Q

Elevation settings for 120

A

0710-1510

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28
Q

81mm 3 types of rounds

A

HE
Illum
Smoke (WP/RP)

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29
Q

How do you find the mounting azimuth

A

Round azimuth to nearest 50mil

30
Q

How do you make adjustments in direct lay

A

Refer sight to bisect splash then traverse back to target and re-bubble up

31
Q

60mm baseplates

A

M7A1-circular, conventional
M8-box
M8A1- newer circular, hand held capable

32
Q

What must you do if the base plate is not settled for direct lay

A

Level the bubbles and prepare to fire, remove the sight, fire two rounds, and put the sight back on and re-level bubbles

34
Q

Number of intervals

A

1 less interval than round

35
Q

Should you always use the lowest charge possible for range

A

Yes, unless you are close to the limit in order to avoid large deflections

36
Q

120 tripod designation

A

M191

37
Q

120/81/60mm mortar sight

A

M67

38
Q

Gun settings for max range

A

800 mil max charge

38
Q

60mm cannon designation

A

M225

38
Q 
81 M177A1 bipod settings
Elevation
1turn
Traverse
1 turn
A

Elevation- 800-1511
1 turn- 10mil
Traverse- 100mils from center
1 turn- 7 mil

40
Q

Deflections rules
Azimuth
Mil adjustment

A

A-RALS(right add, left subtract)

M-LARS

41
Q

80mm bipod designation

A

M177A1

42
Q

81mm ROF

A

Max-30rnds per min, 2 min

Sus.-15rpm, indefinitely

43
Q

60 rate of fire

A

Max-30RPM for 4 min

Sus- 20RPM indefinitely

44
Q

What are two reasons an entire platoon can displace

A

Little likelihood of enemy contact

Another element can provide adequate support

45
Q

M2 compass characteristics
Angle of sight scale
Azimuth scale

A

Angle=1200-0-1200
Azimuth=0-6400
20mil increments
Numbered every 200

45
Q

M8 baseplate traverse capability

A

1600mil

46
Q

81 range

A

Min-83m

Max-5,608

48
Q

If FO is more than 100 m away, what ratio must he use for mil corrections

A

OT/GT

49
Q

120mm cannon designation

A

M298

50
Q

Advantages for engagements with out FDC

A

Speed and less people/equipment required

51
Q

81mm baseplate designation

A

M3A2

51
Q

At what distance should the aiming stakes be emplaced

A

100 and 50m

Or as far away as makes sense and half the distance

52
Q

Rule of thumb for range estimates

A 
0-2000m = 200m error
2000+m = 600-800m error
53
Q

Main difference between hasty/deliberate and emergency

A

Emergency isn’t planned. Usually happens while in route to planned position. Considered a “hip shot”

53
Q

M734 fuze settings birst heights

A

Prox=13-3ft
Near surface= 3-0ft
Impact
Delay-1/2sec

55
Q

How are the mils graded on a whiz wheel

A

Numbered every 100, increment every 10

56
Q

120 baseplate designation

A

M9

57
Q

What must you do on the compass after finding the declination angle

A

Index it onto the compass

58
Q

Which aiming stake is in the middle

A

Far pole in the middle

59
Q

How are deviation corrections sent from FO

A

In mils

60
Q

60 mm elevation settings
Upper saddle
Lower saddle

A

Upper=800-100
1 turn = 10mil
Lower=1101-1511mils
1full turn= 15mil

61
Q

3 types of position occupation

A

Deliberate
Hasty
Emergency

61
Q

81mm mortar cannon designation

A

M253

61
Q

How do you find declination angle

A

Clockwise rotation from grid north to magnetic north

62
Q

Main difference between hasty and deliberate

A

Amount of Time for advanced party to prepare. Both are planned

64
Q

Determine # of rounds

A

60/81- 1rnd per 30m or 4rnd per 100m

120- 1 rnd per 60m or 2rnds per 100m

64
Q

What’s the initial deflection for direct lay?

A

3200

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