Efficiency of block and tackle system

Input(s)

$\mathrm{F}_{\mathrm{h}}$: Load Hoisted (lb)

$\mathrm{v}_{\mathrm{t}}$: Traveling Block Velocity (fpm)

$\mathrm{F}_{\mathrm{f}}$: Load in Fast Line (lb)

$\mathrm{v}_{\mathrm{f}}$: Fast Line Speed (fpm)

Output(s)

E: Efficiency (fraction)

Formula(s)

$$ \mathrm{E}=\frac{\mathrm{F}_{\mathrm{h}} * \mathrm{v}_{\mathrm{t}}}{\mathrm{F}_{\mathrm{f}} * \mathrm{v}_{\mathrm{f}}} $$

Reference(s)

Samuel. E Robello. 501 Solved Problems and Calculations for Drilling Operations. Sigma Quadrant. 2015. Houston, Texas, Page: 10.