Rope Rescue

Question 1

Consider multi-point anchors, Load Distributing multipoint anchor are constructed from multiple single-point anchors. Is this a good solution when a change in the direction of a pull is anticipated?

Answer 1

Yes, it is self-adjusting. It is the most commonly employed load distributing anchors are the two-point and three-point systems.

Question 2

Consider multi-point anchors, Load Sharing systems are constructed from multiple single-point anchors. Is this a good solution when a change in direction of a pull is anticipated?

Answer 2

No, when a load shares one side gets greedy.

Question 3

Consider anchor angle forces. What is the critical angle?

Answer 3

120 degrees, directional ancho will never exceed 120.

Question 4

Considering anchor systems, what would be used when it is not possible to use readily available anchors?

Answer 4

A picket anchor system

Question 5

What is the picket anchor system only as strong as?

Answer 5

Only as strong as the picket material

Question 6

Considering the picket anchor system, what is the load capacity for a single picket?

Answer 6

700lbs

Question 7

Considering the picket anchor system, what is the load capacity for a 1-1 configuration?

Answer 7

1400lbs

Question 8

Considering the picket anchor system, what is the load capacity for 1-1-1?

Answer 8

1800lbs

Question 9

Considering the picket anchor system, what is the load capacity for a 2-1 configuration?

Answer 9

2000lbs

Question 10

Considering the picket anchor system, what is the load capacity for a 3-2-1 configuration?

Answer 10

4000lbs

Question 11

How long is a picket anchor?

Answer 11

4ft long

Question 12

What is the diameter of a single picket anchor?

Answer 12

1 inch

Question 13

Ideally the picket anchor should be constructed out of what material?

Answer 13

1 inch cold rolled steel

Question 14

Considering mechanical advantage systems, Compound MA systems have traveling pulleys moving in what direction and speeds?

Answer 14

Traveling pulleys move in the SAME direction but at DIFFERENT rates of speed.

Question 15

Considering a compound MA system, which pully will move the fastest?

Answer 15

The pully furthest from the load.

Question 16

What is another way to describe a compound MA system?

Answer 16

May also be described as two simple systems working together.

Question 17

The joining of pullys or systems to create a compound system has what type of effect on the calculation of the (MA) mechanical advantage?

Answer 17

cumulative effect.

Question 18

Considering a compound mechanical advantage system, how do you combine the multiple systems to calculate the cumulative effect?

Answer 18

multiply. For example (2:1 x 3:1= 6:1)

Question 19

In what direction do pulleys move with a Complex Mechanical Advantage system? Are the pulley’s rates of speed the same or different?

Answer 19

Pulleys move in different directions and at different rates of speed.

Question 20

Are complex MA systems more or less efficient than compound systems?

Answer 20

More.

Question 21

Are complex MA systems easy or difficult to learn and maintain as a skill?

Answer 21

difficult to learn and maintain as a skill.

Question 22

Considering mechanical advantage, what does TMA stand for?

Answer 22

Theoretical Mechanical Advantage

Question 23

Considering theoretical models for building MA systems, what do they NOT account for?

Answer 23

Friction and other variables

Question 24

Considering rope forces being hauled by the MA of a system, what does (T) stand for when needing to determine force units?

Answer 24

(T) Tension

Question 25

Considering units of tension, if an object weighs 200Ibf (pounds of force), how much force is needed to lift the object? How much Ibf is placed on the high-point directional pulley attaching the suspended object?

Answer 25

200Ibf needed to lift and a total of 400Ibf placed on the high-point

Question 26

Considering the “T” method to calculate units of force, where do you always start your calculations?

Answer 26

Always start at the haul line and work towards the load.

Question 27

Considering the “T” method in a 1:1 MA system, where is the force exerted on the haul (“T”) transmitted?

Answer 27

The force (“T”) gets transmitted along the entire length of the rope.

Question 28

Considering the “T” method for a compound system with a 90-degree pully, what do you multiply by the coefficient force?

Answer 28

1.5