# Capstan and cable friction
# Scope: Limiting static tension ratio on a wrapped cylinder.
# Status: illustrative worked example; engineering review pending.
# Inputs are example values. Checks are editable example requirements, not standards.

slack = 20 N
friction = 0.3
wrap = 180 deg

tight := slack*exp(friction*wrap) [N]

check holding capacity target: tight >= 40 N

scenario alternative: slack = 16 N