Category Topics

Build Logs & Projects

Show your boat. Follow projects from first sketch through build to sea trials, and learn from what worked and what didn’t.
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Economics

Is it worth it? Costs, savings, financing and subsidies for electric and solar boats, and how they compare with diesel in real service.
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Site Feedback

Discussion about this site, its organization, how it works, and how we can improve it.

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Resistance & Propulsion

How much power the boat needs: hull resistance, propellers, shafts and gearboxes, shallow water, and how predictions compare with sea trials.
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General

Create topics here that don’t fit into any other existing category.

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Hull & Stability

Hull form, hydrostatics, loading conditions and stability: GZ curves, heel criteria, freeboard and downflooding, intact and damage stability
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Seakeeping

Boat motions in waves: heave, pitch and roll, passenger comfort, operability limits, and what the conditions on your route mean for the design.
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Batteries, Motors & Charging

Everything electrical: battery chemistry and sizing, motors and inverters, solar on the water, charging infrastructure and electrical safety.
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Using the Calculator

How-to, “is this result right?”, bug reports, feature requests.
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