# Underwater drag and tow power
# Scope: Steady hydrodynamic drag at supplied projected area and drag coefficient.
# Status: illustrative worked example; engineering review pending.
# Inputs are example values. Checks are editable example requirements, not standards.

density = 1025 kg/m^3
speed = 1 m/s
area = 0.1 m^2
coefficient = 0.5

drag := density*speed^2*area*coefficient/2 [N]
power := drag*speed [W]

check drag budget: drag <= 30 N

scenario alternative: density = 820 kg/m^3