63b34g01 suppl 1b
TRANSCRIPT
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63B34G01
Suppl 1b
SOLUTION SHEET TO PRACTICAL EXERCISE
COURSE (S): Wheel 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
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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 thetackle 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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WHEEL 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 = ___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:
Load Resistance _____75,000________
Mechanical Advantage _____2:1___________
Tackle Resistance _____7,500_________
Total Load Resistance _____82,500________
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.
Load Resistance _____38,000________
Mechanical Advantage _____4:1___________
Tackle Resistance _____11,400________
Total Load Resistance _____49,400________
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________
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_______
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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____
10. Load Resistance ____30,000____
Mechanical Advantage _6:1_____
Tackle Resistance ___15,000____
Total Resistance ___45,000____
Fall Line Force _____7,500_____
No Mired
Resistance
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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____
13. Calculate sling leg force.
SLF _26,666_________
L
V X W
N =T
68
2000,40
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14. Calculate sling leg force.
SLF _40,000_________
15. Load Resistance __42,000_________
Mechanical Advantage___4:1_______
Tackle Resistance ___12,600_______
Total Load Resistance __54,600_____
Fall Line Force ____13,650_______
Deadline Force ____54,600_______
16. Calculate sling leg force:
SLF _17,500__________
L
V X
W
N =T
5
10
4
000,80
L
V X
W
N =T
5
10
4
000,35
L
O
A
D
70,000
lbs
Mired road wheel depth
Power to the tracks
80,000 lbs
10 FT5 FT
35 000 lbs
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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______
Tackle Resistance ___60,500_______
Total Resistance ____115,500______
Fall Line Force _____9,625________
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 tothe 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____________
Tackle Resistance _____77,760_________
Total Load Resistance _____336,960________
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_________
Mechanical Advantage ______4:1____________
Tackle Resistance ______69,120_________
Total Load Resistance ______299,520________
Fall Line Force ______74,880__________
Deadline Force ______299,520_________
Winch Capacity ______90,000__________
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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 ______70,000_________
Mechanical Advantage ______3:1____________
Tackle Resistance ______14,000_________
Total Load Resistance ______84,000_________
Fall Line Force ______28,000_________
Deadline Force ______84,000_________
Winch Capacity ______30,000_________