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:
Load Resistance________________
Mechanical Advantage___________
Tackle Resistance _______________
Total Load Resistance____________
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:
Load Resistance________________
Mechanical Advantage___________
Tackle Resistance _______________
Total Load Resistance____________
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.
Load Resistance________________
Mechanical Advantage___________
Tackle Resistance _______________
Total Load Resistance____________
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 ______________
8. Load Resistance _______________
Mechanical Advantage __________
Tackle Resistance ______________
Total Resistance _______________
Fall Line Force ________________
Dead Line Force _______________
9. Load Resistance _______________
Mechanical Advantage __________
Tackle Resistance ______________
Total Resistance _______________
Fall Line Force ________________
Dead Line Force _______________
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10. Load Resistance _______________
Mechanical Advantage __________
Tackle Resistance ______________
Total Resistance ______________
Fall Line Force ________________
11. Load Resistance _______________
Mechanical Advantage __________
Tackle Resistance ______________
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____________
Tackle Resistance ____________
Total Load Resistance ____________
Fall Line Force ____________
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 _____________
Mechanical Advantage__________
Tackle Resistance ____________
Total Resistance ___________
Fall Line Force ____________
18. Load Resistance ____________
Mechanical Advantage__________
Tackle Resistance ____________
Total Resistance ___________
Fall Line Force ____________
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 _______________
Mechanical Advantage____________
Tackle Resistance _______________
Total 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:
Load Resistance _______________
Mechanical Advantage____________
Tackle Resistance _______________
Total Load Resistance____________
Fall Line Force______________
Deadline Force______________
Winch Capacity_____________
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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 _______________
Mechanical Advantage____________
Tackle Resistance _______________
Total Load Resistance____________
Fall Line Force______________
Deadline Force______________
Winch Capacity_____________
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 _______________
Mechanical Advantage____________
Tackle Resistance _______________
Total Load Resistance____________
Fall Line Force______________
Deadline Force______________
Winch Capacity_____________
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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 _______________
Mechanical Advantage____________
Tackle Resistance _______________
Total Load Resistance____________
Fall Line Force______________
Deadline Force______________
Winch Capacity_____________
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:
Load Resistance _______________
Mechanical Advantage____________
Tackle Resistance _______________
Total Load Resistance____________
Fall Line Force______________
Deadline Force______________
Winch Capacity_____________
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:
Load Resistance _______________
Mechanical Advantage____________
Tackle Resistance _______________
Total Load Resistance____________
Fall Line Force______________
Deadline Force______________
Winch Capacity_____________
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 _______________
Mechanical Advantage____________
Tackle Resistance _______________
Total Load Resistance____________
Fall Line Force______________
Deadline Force______________
Winch Capacity_____________
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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:
Load Resistance _______________
Mechanical Advantage____________
Tackle Resistance _______________
Total Load Resistance____________
Fall Line Force______________
Deadline Force______________
Winch Capacity_____________
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