Marine and underwater devices

Hydrostatics and calibrated hydrodynamic coefficients.

hull submerged geometry, water density, payload → buoyancy, draft estimate

waterplane properties, displacement, centers of mass/buoyancy → metacentric-height estimate, small-angle restoring moment

water density, speed, reference area, coefficient → drag, tow power

diameter, speed, density, calibrated coefficients → conditional thrust and shaft power

depth, density, housing geometry → pressure difference, force on closures

displacement, dry mass, water density, ballast material → ballast mass, reserve buoyancy