Hello, I have looked at few of the discussion here on the topic of the thrusters forces. But I would like to confirm my findings.
I have the BlueROV2 and I am graphing up the thruster forces to use with a control project.
My testing involves hanging a newton meter on the top of the ROV and running both of the heave thrusters and writing down the different values with 5% thrust step. The ROV has a 1 M cable between the newton meter. I am using your 14.8V 18 AH battery. When I run the thrusters at 100% downwards thrust (to my understanding that is running the thrusters in forward force that should be higher than reverse) my max reading is 62N. A single thruster should give around 50 N at a voltage of 16V and draw 24A. The battery should be able to supply 90A continuously. I am aware that there is some voltage drop but the combination of the two thrusters should be 100N and the max I can read is 62. That is a significant loss.
Next will be a test to run the 4 surge thrusters would I then see an even bigger drop in performance?