Контекст - расчет наработки талевого каната для перетяжки.
А вот, собственно и он:
CUT OFF LENGTH IN NUMBER OF DRUM LAPS FOR DRILLING LINEнн
X laps + 1/2 lap for counterbalanced grooved drum =
Conversion of laps to length is
p * OD/12 * No.of drum laps
Fast line tension = Hook load/(Number of line x Reeving efficiency)
Reeving efficiency (hm)=
Safety factor ( S.F. ) is equal
Ton- Miles per foot cut when operating at safety factor 5 is 20, for full cut - off length

Спасибо заранее!