Friction-Device Hold Force by Wraps
Hand-side hold force for 1 to 4 wraps on a porta-wrap or lowering bollard by the capstan equation, so one groundie can pick the right wrap count.
Formula and source
hold(n) = load x exp(-mu x n x 2 pi) for n = 1..4 wraps (capstan / Euler-Eytelwein equation). More wraps, exponentially less hand force.
Capstan (Euler-Eytelwein) friction equation and ANSI Z133-2017 by name; first-principles mechanics.
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