Winches
Effort force to raise a load
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A winch is a mechanical device that is used to wind up or wind out a rope or wire rope.
Velocity Ratio
The velocity ratio can be expressed as
VR = R / r (1)
where
VR = velocity ratio
R = effort force radius (m)
r = load radius (m)
Effort Force
The force to raise a load can be expressed as
F = W / μ VR
= W r / μ R
= m ag r / μ R (2)
where
F = force (N)
μ = mechanical efficiency of the system (equal to one for an ideal friction-less system, a fraction less than one for real-world systems with energy losses due to friction)
m = mass (kg)
ag = acceleration of gravity (9.81 m/s2)
W = weight (N)
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