Nautical Ninja
Understand your boat's performance
Browse and compare polar diagrams for hundreds of production sailboats. A polar diagram shows your boat's theoretical maximum speed at every combination of true wind angle and wind speed. That is your performance envelope. Use it to set realistic targets, work out where you're losing speed, and learn how the boat should behave in conditions you haven't sailed in yet.
Polars for hundreds of production sailboats, searchable by name or LOA.
Interactive diagram showing speed at every wind angle and wind speed.
Exact target speeds laid out as a table, easy to read at the helm.
Download polar data for use in navigation software like OpenCPN.
Compare similar designs side by side and see which is faster upwind, downwind, or in light air.
Know your target speed at every point of sail so you have a benchmark to aim for on the racecourse.
Consistently underperforming the polar means something is wrong. Usually it's the bottom, the sails, or the trim.
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