Rope Rescue Flashcards
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?
Yes, it is self-adjusting. It is the most commonly employed load distributing anchors are the two-point and three-point systems.
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?
No, when a load shares one side gets greedy.
Consider anchor angle forces. What is the critical angle?
120 degrees, directional ancho will never exceed 120.
Considering anchor systems, what would be used when it is not possible to use readily available anchors?
A picket anchor system
What is the picket anchor system only as strong as?
Only as strong as the picket material
Considering the picket anchor system, what is the load capacity for a single picket?
700lbs
Considering the picket anchor system, what is the load capacity for a 1-1 configuration?
1400lbs
Considering the picket anchor system, what is the load capacity for 1-1-1?
1800lbs
Considering the picket anchor system, what is the load capacity for a 2-1 configuration?
2000lbs
Considering the picket anchor system, what is the load capacity for a 3-2-1 configuration?
4000lbs
How long is a picket anchor?
4ft long
What is the diameter of a single picket anchor?
1 inch
Ideally the picket anchor should be constructed out of what material?
1 inch cold rolled steel
Considering mechanical advantage systems, Compound MA systems have traveling pulleys moving in what direction and speeds?
Traveling pulleys move in the SAME direction but at DIFFERENT rates of speed.
Considering a compound MA system, which pully will move the fastest?
The pully furthest from the load.
What is another way to describe a compound MA system?
May also be described as two simple systems working together.
The joining of pullys or systems to create a compound system has what type of effect on the calculation of the (MA) mechanical advantage?
cumulative effect.
Considering a compound mechanical advantage system, how do you combine the multiple systems to calculate the cumulative effect?
multiply. For example (2:1 x 3:1= 6:1)
In what direction do pulleys move with a Complex Mechanical Advantage system? Are the pulley’s rates of speed the same or different?
Pulleys move in different directions and at different rates of speed.
Are complex MA systems more or less efficient than compound systems?
More.
Are complex MA systems easy or difficult to learn and maintain as a skill?
difficult to learn and maintain as a skill.
Considering mechanical advantage, what does TMA stand for?
Theoretical Mechanical Advantage
Considering theoretical models for building MA systems, what do they NOT account for?
Friction and other variables
Considering rope forces being hauled by the MA of a system, what does (T) stand for when needing to determine force units?
(T) Tension
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?
200Ibf needed to lift and a total of 400Ibf placed on the high-point
Considering the “T” method to calculate units of force, where do you always start your calculations?
Always start at the haul line and work towards the load.
Considering the “T” method in a 1:1 MA system, where is the force exerted on the haul (“T”) transmitted?
The force (“T”) gets transmitted along the entire length of the rope.
Considering the “T” method for a compound system with a 90-degree pully, what do you multiply by the coefficient force?
1.5
