Rigging Bench · Field Tool

Powerband Size Calculator

Cut your latex to length for a clean, repeatable draw. Enter your measured band route and pick your tubing.

Side view of a speargun with the shaft loaded: the band route D is measured from the muzzle band anchor to the loading notch, following the band's path. D — band route loading notch muzzle band anchor
Shaft loaded: measure D from the muzzle band anchor to the loading notch, following the band's path.

With the shaft loaded, measure from the muzzle band anchor to the loading notch, along the band's path.

Relative power
3.03.43.8
6810
Cut length of latex
—cm
per leg = — cm

Lcut = (2·D − W) ÷ S · Ratios tuned for natural latex; for black/synthetic or progressive bands follow the maker's elongation. Trim in small increments and test.

Built by Fishes One Hook — spearfishing gear & technique.