Hello, I'm designing a towed underwater vehicle (towfish) and I am having trouble with determining cable tension at the length of the cable at given depths and speeds. I have estimates of vehicle drag at speeds up to 4 m/s and the vehicle weight in water is known. Its really just the effect of the cable on the whole system and the eventual steady state shape it will take. I've attached a diagram of the forces for reference. Does anyone know of any simple methods for estimating this? At this point the project is very preliminary and I would not need any detailed simulations or anything. Just the steady state shape.