63H34F01 Suppl 1a

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63H34F01

Suppl 1a

PRACTICAL EXERCISE

COURSE (S): Track Vehicle Mechanic (BNCOC)

SUBJECT: Basic Recovery and Rigging Techniques

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

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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.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

MireFactor-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 = ______________

Mechanical Advantage MA = ______________

Tackle Resistance TR = ______________

Total Load Resistance TOLR = ______________

Fall Line Force FLF = ______________

Dead Line Force DLF = ______________

Winch Capacity WC = ______________

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________________

Mechanical Advantage___________

Tackle Resistance _______________

Total Load Resistance____________

Fall Line Force__________________

Deadline Force __________________

Winch Capacity__________________

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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:





Fall Line Force__________________

Deadline Force __________________

Winch Capacity__________________

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__________________

Deadline Force __________________

Winch Capacity__________________=

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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.





Fall Line Force__________________

Deadline Force __________________

Winch Capacity__________________=

6. Load Resistance _______________

Mechanical Advantage __________

Tackle Resistance ______________

Total Resistance _______________

Fall Line Force ________________

Dead Line Force _______________

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7. Load Resistance ______________

Mechanical Advantage ___ _____

Tackle Resistance _____________

Total Resistance ______________

Fall Line Force _______________

Dead Line Force ______________













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Total Resistance ______________






Fall Line Force _______________

12. Load Resistance _____________

Mechanical Advantage__________

Tackle Resistance ____________

Total Resistance ___________

Fall Line Force ____________

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13. Calculate sling leg force.

SLF __________

14. Calculate sling leg force.

SLF __________

15. Load Resistance ____________

Mechanical Advantage____________


Total Load Resistance ____________


Deadline Force ____________

T =

N

W X

V

L

T =N

W X V

L

L

O

A

D

70,000

lbs

Mired road wheel depth

Power to the tracks

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16. Calculate sling leg force:

SLF ____________

17. Load Resistance _____________





18. Load Resistance ____________





T =N

W X V

L

80,000 lbs

10 FT5 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 _______________




Fall Line Force______________

Deadline Force______________

Winch Capacity_____________

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:








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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:








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:








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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:








24. Calculate sling leg force

SLF=_____________

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








T =N

W X V

L

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:








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:








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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:








63H34F01 Suppl 1a

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