This Prototype 2 is much better,its powerful in the water.I have test it,and working good.
Thrusters weight is 1500 gram (one)
Size of the Thrusters,diameter 48MM,propellers is 100MM,length is 265MM
Size of magnet: 10MM X 10MM (Neodymium) Magnetic couplings have diameter: 39MM X 12MM, six hole.
I will now make a Vertical Thrusters, I only need one.(I will use same as prototype 2,with some modification)
Here is some picture:





