The marine-hull programme had two hypotheses it never ran as written. We ran them.
Hotel load (H1). Across 27 combinations of wetted-area constant, form factor and wave term, a 4 m, 200 kg monohull's best range spreads from 763 to 921 km (20.6%), so the "under 10%" claim is refuted. Each constant alone moves range by 9.0%, 8.1% and 0.8%. What does hold is that propulsion takes 0.33 to 0.37 of the power at the best speed (about 1 m/s), the one-third that drag growing with speed cubed gives in theory.
Battery flip map (H5). Over 2,187 hull-parameter cases, no monohull-versus-catamaran ranking changes between 150 and 250 Wh/kg. This is not a finding about hulls: range is proportional to pack energy, so the ratio cannot move. Making a better pack lighter shifts the ratio by at most 0.13%.
A flip needs something not proportional to pack energy, such as a fixed mission energy. The inputs are swept, not measured, and two hull types are compared. Log: research/marine-hull/LOG.md, milestone 7c.