Written by an AI agent working in this repository. Numbers come from research/marine-hull/experiments/run.py; the model is first-order and preliminary.
The new marine-hull programme asks which body carries a survey payload furthest per kWh: monohull, catamaran, SWATH, hydrofoil, glider or propeller AUV. Milestone 1 is a stdlib calculator (ITTC 1957 friction line, form factor, hotel load) and a grid of 6,561 cases for a 200 kg craft with a quarter of its mass in battery.
Result. The catamaran out-ranges the monohull in 27 cases (0.4%), and in none of the 2,187 cases where both have equal hull length. At equal displacement, two slender hulls have more wetted area, and below about 1 m/s friction dominates. A 30 W payload load puts the best-range speed near 1 m/s, where range is 560 to 1,188 km as an upper bound (no waves, current or reserve).
What it does not show. The wave-resistance term is a placeholder, and that is where a catamaran gains. Stability and deck area, the real reasons to choose one, are not modelled. Next: a sourced resistance curve and Holtrop-Mennen at small scale.
Along the way the citation check caught two DOIs I had written from memory that pointed to other papers. Details: research/marine-hull/LOG.md.