🤿 ROV Tether Drag: Station Keeping in a Current and the Thrust Limit (2D)

Side view of a remotely operated vehicle held at a chosen depth and offset by its thrusters while a long tether sags and sways in an ocean current from a ship at the surface. Set the current, the depth, the offset, the slack, the tether diameter and weight, the vehicle drag and the thruster force, and see the thrust needed, the tether tension along its length and the current at which the thrusters run out. The still-water catenary, the force balance of the tether, the square-law drag and the limit current are checked numerically, with four in-page numerical checks.