MA's

Question 1

What does IMA stand for?

Answer 1

Ideal Mechanical Advantage

Question 2

What does AMA stand for?

Answer 2

Actual Mechanical Advantage

Question 3

If the rope used in the pulley system is tied to the ANCHOR, the IMA is EVEN or ODD?

Answer 3

Even

Question 4

If the rope used in a simple pulley system is tied to the LOAD, is the IMA EVEN or ODD?

Answer 4

Odd

Question 5

If the IMA is EVEN, is the pulley system integral or ganged on?

Answer 5

Ganged on

Question 6

If the IMA is ODD, is the pulley system integral or ganged on?

Answer 6

Both; Example: 5:1 ganged on or 5:1 integral.

Question 7

When is a haul slacker needed?

Answer 7

For a ganged on system

Question 8

What is the maximum number of haulers you can have on a system?

Answer 8

(# of haulers) x (IMA) = less than or equal to 18

Question 9

Which definitions does a Complex Pulley System meet? Simple or Compound

Answer 9

Neither

Question 10

What are the Pros of a ganged on system?

Answer 10

Passing a knot is easier
Can be pre-built

Question 11

What are the Cons of a ganged on system?

Answer 11

A haul slacker is needed
More gear resources

Question 12

What are the Pros of a integral system?

Answer 12

Less gear resources
No haul slacker

Question 13

Define a Simple MA

Answer 13

MA system with a single haul connection between the load and the haul team with 1 throw. All pulleys that move do so at the same speed and direction as the load

Question 14

Define a Compound MA

Answer 14

A simple MA system pulling on the haul line of another simple MA with at least 2 throws. Some traveling pulleys move at different speeds than the load

Question 15

Define a Complex MA

Answer 15

An MA system that Is neither a simple nor a compound system – 5:1 California

Question 16

True or false: typically, lowering systems are safer than raising systems?

Answer 16

True, because you are cooperating with gravity (Rope rescue course, pg 87)

Question 17

Define ideal load weight

Answer 17

Weight of the load in a static state

Question 18

Define practical load weight (PLW)

Answer 18

The actual weight of the load, plus the friction coefficient. A 450 pound load with 20 feet of rope drag can increase to 1100 pounds (RRC, pg 87). You can control rope drag with a high directional

Question 19

During a raise, a 90 degree turn over a rock will add how many times the weight at the edge?

Answer 19

3x (RRC, pg 92)

Question 20

What is the formula to determine the what percentage each anchor has?

Answer 20

Assuming a 100 lb load and a 60 degree angle:

1/2 the load / cos(.5 angle)

50/cos(30) = about 57.7%

Question 21

What is the force vector formula for a directional pulley anchor? Need to finish

Answer 21

Force vector =

Question 22

A haul prussik typically slips at how many pounds?

Answer 22

800 to 1200 pounds

Question 23

The IMA is the ratio between..

Answer 23

The distance the load moves and the distances the haul team moves

Question 24

What is the definition of a piggyback system?

Answer 24

A compound MA that’s made up of two or more identical simple MAs

Question 25

What is the definition of a throw?

Answer 25

The available distance between maximum pulley system extension and two block (RRC, pg 96). In the diagram it’s basically the distance between the tandem prussiks close to the anchor and the prusik closest to the load. Simple pulley systems have one throw, compounds have a minimum of two

Question 26

What are the pros and cons of a simple MA?

Answer 26

Pros: easy to remember and perform, have long throws and are easily modified if more MA is needed

Cons: typically have more friction, use more rope, and require more equipment in larger MAs [RRC pg 97)

Question 27

If you’re out of pulleys and have to use a carabiner, where in the system should you put it?

Answer 27

Closer to the load, further from the haulers

Question 28

MA Math Formulas

Answer 28

Anchor Loads = T x AMA(r)
AMA(r) = AMA relative at the anchor

T = Rescue Load / AMA