Frequently Asked Questions
How fast is 10 knots?
About 11.5 mph or 18.5 km/h. Cruising speed for a 35-foot sailboat is typically 5-8 knots.
What is hull speed for a 40-foot boat?
1.34 · sqrt(40) = 8.47 knots. Below this, water resistance grows linearly; above it, resistance climbs steeply.
Can a sailboat go faster than hull speed?
Yes briefly, especially surfing down waves, but not sustained without planing. Planing requires a flat bottom and enough power - rare for displacement sailboats.
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