Calculators
Speed calculator
Pick a boat from … measured hulls for its hull speed, its displacement/length ratio and where that puts it on the curve most displacement hulls cannot push past — then work out a realistic passage time, well below hull speed.
Nothing picked yet.
m
m
m
m
kg
kn
Derived
Each figure shows how it's worked out.
The displacement-speed curve
The shape of this curve is illustrative, not measured for this boat — a real resistance curve needs this hull's actual lines and a towing-tank or VPP run. What is specific to this boat is the shaded band, drawn from its own displacement/length ratio, and the knot values under each tick, drawn from its own waterline length.
Passage time
nm
kn