Witch is the best 12V DC motor for RC ROV? also need to be waterproof!
That is a "how long is a rope?" question. You have not provided enough information. Are the motors brushed or BLDC? How much torque? How many RPM? How much current is available? Define "best".
Motors are (NTM Prop Drive Series 28-30A 750kv / 140w ).For power i will use motorcycle accumulator (12V 20 Ah).For propeller (3-Blade Boat Propellers 40x57mm (2pcs/bag)) or (Turnigy 4mm AquaProp 43x26x9mm) i dont know witch one of this two to use.Motors will be menage with PS2 controller.
I need board(shield) for rilation between 3 motors and Arduinouno?
Thank you!
Without information on both the "RC ROV" (what is it?) and on your requirements, there is no answer to "best"
Standard electric motors are not waterproof in the slightest. You will have to provide that, or find a
specialist provider for the application that does IP68 or better.
Sizing the motors requires knowing what the load is, which is probably specialist knowledge for real
world water screws and will need things like drag coefficient, friction losses in water seals, etc to
be factored in.