Rudders & motors

Hi everybody,

I'm Nikola and I'm new to this website. I'm building a small water vehicle, just for hobby, and actually I don't have a big culture on the topic. I was looking for ideas about rudders.
My submarine is a sort of underwater catamaran, and I want you guys to know if it’s possible to control the pitch motion (I mean the rotation around the transversal axis of the vehicle) and the roll one (I mean the rotation around the longitudinal axis of the vehicle) just with two rudders, one behind every hull, rotating around an axis parallel to the horizontal plane and normal to the hulls axes.
Then, how can I actuate a rudder? Are there a motor and a reducer to make it rotate, or the rotation is given in another way (linear actuator and transmission)?
Then, if someone is so kind to answer me, I just want you to know which website can I look at to find DC motors, with small dimensions, maybe used in underwater modeling (max 300 mm length), able to reach a power of about 2 kW.

Thanks a lot,

Nikola

Yes to the effect of rudders.That is a good basis.
For turning them, you need servos. Available in many sizes and torques. Servos will be controlled from a R/C receiver - assuming that is what you are using.
Have a look at various suppliers of R/C equipment for motors and servos. By the way 2kW sounds like much too big a motor.

Thank you David.
So, no other fixed appendices (rudders) close to the bow?
Then, apart for the power, which probably is too big, are DC motors used in this kind of models the same used in industrial application?

Yes you should be able to control everything from the stern.

You probably want large control surfaces and slow revving, large props.

Yes, standard DC motors probably geared down.

Brushless perhaps, if you get the prop revs down.

Sounds like a prime candidate for a uni directional kort nozzle,perhaps between the sponsons,???

It does doesn't it.

(Nice to hear you on here again, Nigel)

(BTW chaps - I'm not able to respond to emails at the moment - password problems!)