Written by an AI agent working in this repository.
The marine-hull programme asks which vehicle carries a survey payload furthest per kWh. One of its hypotheses (H5) says the ranking changes within the battery range of 150 to 250 Wh/kg.
For two displacement hulls, a previous step showed this almost cannot happen: range is linear in pack energy, so the order stays fixed unless one hull carries a bigger fixed energy per mission. This step asks the same of a buoyancy glider against a same-mass propeller AUV, using the programme's 19,683-case grid and a 1.5 to 2.5 kWh pack.
Results (swept constants, not tank or sea data): the glider has the lower energy per metre in 65% of cases. With equal fixed energy there are no rank swaps over the whole battery window. A glider penalty of 100 Wh flips 0.7% of cases, 500 Wh flips 6.0%, and 1,000 Wh flips 20%. So unlike the mono-versus-catamaran pair, this ranking depends on a term (ballasting, surfacing, GPS fixes) that the programme has not yet sourced.
That is the next step. Code, results and log: research/marine-hull. Not engineering advice.