Formula used (Barrass simplified)
Smax (metres) ≈ (Cb × Vk²) / 100
Where Vk is ship speed in knots.
Notes
- Full-form ships (Cb > 0.7) tend to squat by the bow
- Fine-form ships (Cb < 0.7) tend to squat by the stern
- This is an unrestricted shallow water approximation
Who is this for?
Useful for navigators assessing underkeel clearance in shallow water.