63H34F01 Suppl b

7/27/2019 63H34F01 Suppl b

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63H34F01

Suppl 1b

SOLUTION SHEET TO PRACTICAL EXERCISE

COURSE (S): Track Vehicle Mechanic (BNCOC)

SUBJECT: Basic Recovery and Rigging Techniques

REFERENCE: FM 9-43-2 Recovery/BDAR 10/95

FM 5-125 Rigging 10/95

INTRODUCTION:

During this lesson, the method to determine mechanical advantage has been discussed. This

practical exercise will give you a chance to practice your ability to compute mechanical

advantage. Remember that, without the proper use of mechanical advantage, it would be

impossible to perform the recovery operation.

RIGGING FORMULA

SHORT

LOAD RESISTANCE (LR) = VW + OR - CGO * MF - RF

MECHANICAL ADVANTAGE (MA) = LR WC

TACKLE RESISTANCE (TR) = 10% OF LR * number of sheaves (1 less than MA for word

problems only)

TOTAL RESISTANCE (TOLR) = TR + LR

FALL LINE FORCE (FLF) = TOLR MA

DEAD LINE FORCE = FLF * most winch lines which are supported by a dead line.

WINCH CAPACITY (WC) = given

RIGGING FORMULA

LONG

LOAD RESISTANCE (LR) = Vehicle weight plus the cargo weight, times the mire factor,

minus the reduction factor.

MECHANICAL ADVANTAGE (MA) = Load resistance divided by winch capacity . Round up to

the nearest whole number.

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TACKLE RESISTANCE (TR) = 10 % of the load resistance times the number of sheaves in the

tackle system. The number of sheaves is always one less than the

mechanical advantage.

TOTAL RESISTANCE (TR) = Load resistance plus tackle resistance.

FALL LINE FORCE (FLF) = Total load resistance divided by the mechanical advantage; must

be less than the winch capacity.

DEAD LINE FORCE (DLF) = Fall line force times number of most winch lines which are

supported by a deadline.

WINCH CAPACITY (WC) = Given

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TRACK VEHICLE

MIRE RESISTANCE

Mire

Factor-2

Mire

Factor-3

Mire

Factor-1

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DIRECTIONS: Work the following situations and find the solutions.

1. A 100,000-pound vehicle is mired over the top of its wheel. You have an M88A1 recovery

vehicle with a main winch capacity of 90,000 pounds. Calculate the following:

Load Resistance LR = ___200,000____

Mechanical Advantage MA = ___3:1_________

Tackle Resistance TR = ___40,000______

Total Load Resistance TOLR = ___240,000_____

Fall Line Force FLF = ___80,000______

Dead Line Force DLF = ___240,000_____

Winch Capacity WC = ____90,000_____

2. A cargo truck, weighing 45,000 lbs with cargo is mired to the top of the fender. The cargo

weight is 12,000 lbs. It can be recovered in the opposite direction of travel. The winch

capacity of the recovery vehicle is 35,000 lbs. Work the solution without the load.

Load Resistance ____114,000_______

Mechanical Advantage ____5:1___________

Tackle Resistance ____45,600________

Total Load Resistance ____159,600_______

Fall Line Force ____31.920________

Deadline Force ____159.600________

Winch Capacity ____35,000_________

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3. A 35,000-pound vehicle is mired over the top of it wheels. You have a recovery vehicle with a

main winch capacity of 60,000 pounds. You have power to the wheels and the capability of

recovering it in the opposite direction of travel. Calculate the following:

Load Resistance _____70,000________

Mechanical Advantage _____2:1___________

Tackle Resistance _____7,000_________

Total Load Resistance _____77,000________

Fall Line Force _____38,500________

Deadline Force _____77,000 ________

Winch Capacity _____60,000________

4. A 25,000-pound cargo truck is mired over the fender. You have a recovery vehicle that has a

main winch capacity of 60,000 pounds. Calculate the following:





Fall Line Force _____41,250________

Deadline Force _____82,500________

Winch Capacity _____60,000________

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5. A bridge transporter weighing 28,800 lbs is disabled on 40% incline. The vehicle is loaded

with a cargo weight of 10,000 lbs. The recovery winch capacity is 14,500.



Tackle Resistance _____11,400________


Fall Line Force _____12,350________

Deadline Force _____49,400________

Winch Capacity _____14,500________

6. Load Resistance __56,000________

Mechanical Advantage __2:1______

Tackle Resistance __5600_________

Total Resistance ___61,600________

Fall Line Force ____30,800________

Dead Line Force ___61,600________

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7. Load Resistance ___118,800_______

Mechanical Advantage ___3:1 _____

Tackle Resistance ___23,760_______

Total Resistance ___142,560_______

Fall Line Force ____47,500________

Dead Line Force ___142,560_______

8. Load Resistance _____96,000_____

Mechanical Advantage ____3:1___

Tackle Resistance ____19,200____

Total Resistance _____115,200___

Fall Line Force _______38,400___

Dead Line Force _____115,200___

9. Load Resistance ____32,000_____

Mechanical Advantage ___4:1___

Tackle Resistance ___9,600_____

Total Resistance ____41,600____

Fall Line Force _____10,400____

Dead Line Force ____41,600____

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10. Load Resistance ____30,000____

Mechanical Advantage _6:1_____

Tackle Resistance ___15,000____

Total Resistance ___45,000____

Fall Line Force _____7,500_____

11. Load Resistance _90,000___________

Mechanical Advantage _12:1_______

Tackle Resistance ____99,000______

Total Resistance _____189,000_____

Fall Line Force _______15,750_____

12. Load Resistance ___45,000________

Mechanical Advantage___16:1_____

Tackle Resistance ____67,500_____

Total Resistance _____112,500____

Fall Line Force ______7,031.25____

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13. Calculate sling leg force.

SLF _26,666_________

14. Calculate sling leg force.

SLF _40,000_________

15. Load Resistance __42,000_________

Mechanical Advantage___4:1_______


Total Load Resistance __54,600_____

Fall Line Force ____13,650_______

Deadline Force ____54,600_______

L

V X

W

N =T

6

8

2

000,40

L

V X W

N =T

510

4000,80

L

O

AD

70,000

lbs

Mired road wheel depth

Power to the tracks

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16. Calculate sling leg force:

SLF _17,500__________

17. Load Resistance _180,000__________

Mechanical Advantage__20:1_______

Tackle Resistance __342,000________

Total Resistance ___522,000________

Fall Line Force ____26,100_________

18. Load Resistance _ 55,000 __________

Mechanical Advantage__12:1______


Total Resistance ____115,500______

Fall Line Force _____9,625________

L

V X

W

N =T

510

4000,35

80,000 lbs

10 FT

5 FT

Load

55,000 LBS

180,000 LBS

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19. A vehicle that weighs 128,000 pounds is mired over the top of its road wheels. You have an

M88A1 with a winch capacity of 90,000 pounds. It has power to the tracks and can be

recovered in the opposite direction of travel. Work the following solution:

Load Resistance ____64,000________

Mechanical Advantage ____1:1___________

Tackle Resistance ____6,400_________

Total Load Resistance ____70,400________

Fall Line Force ____70,400________

Deadline Force ____70,400________

Winch Capacity ____60,000________

20. A cargo truck weighing 50,000 pounds is carrying 12,000 pounds of cargo and is mired to the

top of the fender. It can be recovered in the opposite direction of travel. The winch capacity of

the HEMTT wrecker is 60,000 pounds. Work the solution:

Load Resistance _____124,000______

Mechanical Advantage _____3:1__________

Tackle Resistance _____24,800_______

Total Load Resistance _____148,800______

Fall Line Force _____49,600________

Deadline Force _____148,800_______

Winch Capacity _____60,000________

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21. An M113A3 APC, weighing 23,000 pounds is mired over the fender. The vehicle is

operational and is on a 10% grade but cannot be recovered in its own tracks. The winch

capacity on the M1089 recovery vehicle is 30,000 pounds. Calculate the following:

Load Resistance ____41,400__________

Mechanical Advantage _____2:1____________

Tackle Resistance ____4140___________

Total Load Resistance _____45,540_________

Fall Line Force _____22,770_________

Deadline Force _____45,540_________

Winch Capacity _____30,000_________

22. A truck weighing 12,400 pounds is loaded with cargo that weighs 5,000 pounds, is mired

fender deep on a 25% incline. The cargo cannot be removed; the winch capacity of the recovery

vehicle is 15,000 pounds. Calculate the following:

Load Resistance _____34,800__________

Mechanical Advantage _____3:1 _____________

Tackle Resistance _____6,960___________

Total Load Resistance _____41,760__________

Fall Line Force _____13,920__________

Deadline Force _____41,760__________

Winch Capacity _____15,000__________

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23. An M934 expandable van weighing 30,000 pounds is mired fender deep on a 40% incline. The

winch capacity of the M936 wrecker is 28,000 pounds. Calculate the following:

Load Resistance _____60,000__________

Mechanical Advantage _____3:1_____________

Tackle Resistance _____12,000__________

Total Load Resistance _____72,000__________

Fall Line Force _____24,000__________

Deadline Force _____72,000__________

Winch Capacity _____28,000__________

24. Calculate sling leg force

SLF=__30,000_________

25. An M930 Dump truck that weighs 26,000 pounds is disabled on a 65% upgrade. It is loaded

with cargo that cannot be removed; the weight of the cargo is 10,000 pounds. There is power to

the wheels and you can recover in the opposite direction of travel. You have a M936 with a

main winch capacity of 28,000 pounds. Calculate the following:

Load Resistance ______36,000_________

Mechanical Advantage ______2:1____________

Tackle Resistance ______3,600__________

Total Load Resistance ______39,600_________

Fall Line Force ______19,800_________

Deadline Force ______39,600_________

Winch Capacity ______28,000_________

L

V X

W

N =T

6

18

2

000,20 20,000 lbs

18 FT6 FT

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26. A track vehicle that weighs 96,000 pounds is mired turret deep. You have an M88A1 with a

main winch capacity of 90,000 pounds, the vehicle is not operational and you have the ability

to recover in the opposite direction of travel. Work the following solution:

Load Resistance _____259,200________

Mechanical Advantage _____4:1____________



Fall Line Force _____84,240_________

Deadline Force _____336,960________

Winch Capacity _____90,000_________

27. A vehicle that weighs 128,000 pounds is mired over the road wheels. You have a vehicle with a

main winch capacity of 90,000 pounds, you have no power to the tracks but you can recover in

the opposite direction of travel. Calculate the following:

Load Resistance _____230,400_________


Tackle Resistance ______69,120_________

Total Load Resistance ______299,520________

Fall Line Force ______74,880__________

Deadline Force ______299,520_________

Winch Capacity ______90,000__________

28. A M1084 cargo truck weighing 25,000 pounds is carrying 10,000 pounds of cargo and mired to

the top of its fender. It can be recovered in the opposite direction of travel. The winch capacity

of the M1089 recovery vehicle is 30,000 pounds. Calculate the follow:

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Load Resistance ______70,000_________


Tackle Resistance ______14,000_________

Total Load Resistance ______84,000_________

Fall Line Force ______28,000_________

Deadline Force ______84,000_________

Winch Capacity ______30,000_________

63H34F01 Suppl b

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