EZ
Virtual Tools | Marine
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Petroleum
All Calculators
Spring
Line
Calculator
Calculate spring line angles, lengths, and load distribution for surge control
Input Parameters
Boat Length (ft)
Freeboard at Cleat (ft)
Dock Height (ft)
Tidal Range (ft)
Max Wind Force (lb)
Calculate
Results
--
Forward Spring
ft
--
Aft Spring
ft
--
Optimal Angle
degrees
--
Surge Load per Line
lb
Reference
Spring line angle: 15-45° from centerline Length accounts for tidal range and height difference Surge load = wind force / (2 × cos(angle))