Portlandjib.com
sample crane lessons
 

Lesson # 1

   Compute the Mechanical Advantage of pulleys with 1, 2 or 4 parts of line

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Lesson # 2

  Use the formula to find the Center of Gravity for an off-centered load

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Lesson # 3

Decide on a value for RM/OTM and compute the counter weight and its distance from the fulcrum

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Lesson # 4

 For a given load and boom angle, compute the Tension in the boom line using the Sine function

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Lesson # 5

Determine the best sling angle for a given load

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Lesson # 6

  Use trig to find the overturning moment (Clockwise CW) and righting moment (Counter-clockwise CCW)

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