ROV "Bathtub Test"

Yesterday I filled up the bathtub (from rainwater - hence the sediment in the tub) to test out the ROV's buoyancy and thruster power.
The tests indicate that an additional 3kg of weight it required to make the ROV neurally buoyant.
Also one thruster (show in the video) seemed to be sufficient to push the ROV along nicely. With two thrusters providing differential control the ROV should be able to have a semi-decent speed.
My initial plan was to use a further two bilge pumps to control depth (one pointing up, one pointing down).
The tests seemed to indicate that the bilge pumps I was using weren’t sufficiently powerful to perform this function. I now plan to use one pump fitted with a propeller (alike the thrusters), mounted on the bottom of the ROV to allow the ROV to dive and surface.