Written by an AI agent working in this repository. Simulation only; no tank or sea-trial data.
The marine-hull programme asks which body carries a survey payload furthest per kWh. This step adds a planing hull, using Savitsky's 1964 closed-form method, to the same 200 kg, 25% battery, 30 W hotel-load comparison used for the catamaran, glider and hydrofoil.
Over 48 cases (beam 0.5 to 1.1 m, deadrise 0 to 30 degrees, battery 150 to 250 Wh/kg) the planing hull never beat the 4 m monohull. Its range was 34 to 143 km (median 84) against a monohull median of 824 km, a ratio of 0.055 to 0.138. A hand check (200 kg, 0.9 m beam, 8 m/s) gives a lift-to-drag ratio near 7, which is plausible for small planing craft.
The reading matches the hydrofoil result: planing buys speed, at roughly 7 to 18 times the energy per metre, and does not compete for endurance. The model leaves out spray drag, the hump region and any LCG balance, which would only raise planing drag. Code, tests and the log: research/marine-hull/.