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CAMRA - 2019 Recruit Knowledge > Mech Advantage > Flashcards

Mech Advantage Flashcards

1
Q

What are the three categories of MAs

A
  • Simple
  • Compound
  • Complex
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2
Q

How do you determine if the MA is odd or Even

A

If the MA starts at the load, its ODD

If the MA starts at the anchor, its EVEN

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3
Q

Define a “simple” MA system

A

A simple MA system consists of a single haul connection between the load and the haul team

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4
Q

Define a “compound” MA system

A

A compound MA consists of a simple MA pulling on the haul line of another simple MA

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5
Q

Define a “complex” MA system

A

A complex MA is neither a simple, nor a compound MA.

It will also incorporate “floating” pulleys that move toward each other as the system is put in motion

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6
Q

Define a “integral” MA system

A

An MA system that consists of a single rope

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7
Q

Define a “Ganged On” MA system

A

An MA system that is built separate from the working line with a second rope, and is attached to the mainline by a haul prussik

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8
Q

Define a “pig rig” MA

A

A pig rig is a compound MA system that is made up of two identical simple MAs that is then ganged on the mainline.

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9
Q

Define a Change of Direction Pulley

A

A c.o.d. pulley is is a pulley that is attached to the anchor and is last pulley before the haul team.

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10
Q

Define “IMA” or Ideal Mechanical Advantage

A

The IMA is the ratio between the input and the output of an MA in an ideal world with 100% efficiencies

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11
Q

Define “PMA” or Practical Mechanical Advantage

A

The PMA is the ratio between the input and the output of an MA with efficiency losses from pulleys or carabiners calculated.

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12
Q

What are some considerations when deciding on what MA you should use in a given situation

A
  • rope and equip available
  • size of load
  • number of haulers available
  • haul field or work area
  • the “throw” same as haul field?
  • adaptability
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13
Q

What are some considerations concerning a Ganged On MA

A
  • will need a haul slacker
  • will need two ropes or a split rope
  • Can prebuild
  • easier knot pass
  • more versatile anchors
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14
Q

What are some considerations concerning an integral MA

A
  • only one rope needed
  • does not need a haul slacker
  • more complicated and gear intensive knot pass
  • can not prebuild
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15
Q

What equipment is needed to build a 3:1 Integral MA (not including the anchor, rigplate, or the carabiner used to attach end of the rope to the shelf

A
  • One rope
  • two pulleys (single or double)
  • three prusiks (One set of blue and red, and a red)
  • two carabiners
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16
Q

What equipment is needed to build a 3:1 Cod Integral MA (not including the anchor, rigplate, or the carabiner used to attach end of the rope to the shelf

A
  • One rope
  • three pulleys (or two if a double is used to incorporate the Cod
  • three prusiks
  • three carabiners (or two if a double pulley is used)
17
Q

What equipment is needed to build a 4:1 Ganged On (not including the anchor, rigplate, or the carabiner used to attach end of the rope to the shelf

A
  • Two ropes (or one rope split in two)
  • two double pulleys
  • three prusiks
  • four carabiners
18
Q

What equipment is needed to build a 4:1 Pig MA (not including the anchor, rigplate, or the carabiner used to attach end of the rope to the shelf

A
  • Two ropes (or one rope split into three)
  • Two pulleys (single or double)
  • Four Prusiks
  • Five Carabiners
19
Q

What equipment is needed to build a 5:1 Integral MA (not including the anchor, rigplate, or the carabiner used to attach end of the rope to the shelf

A
  • One rope
  • Two double Pulleys
  • Three prusiks
  • two carabiners
20
Q

What equipment is needed to build a 5:1 Ganged ON MA (not including the anchor, rigplate, or the carabiner used to attach end of the rope to the shelf

A
  • Two Ropes (or one rope split into two)
  • Two double pulleys
  • Three Prusiks
  • Four Carabiners
21
Q

What equipment is needed to build a 6:1 (“C” on a “Z”) MA (not including the anchor, rigplate, or the carabiner used to attach end of the rope to the shelf

A
  • Two ropes (or one rope split into two)
  • Three Pulleys (singles or doubles)
  • Four prusiks
  • Four carabiners

CAMRA - 2019 Recruit Knowledge (14 decks)

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