Azimuth propulsion - camparasion of technologies

[eggert]

Dear forum!

I'd like to compare some different types of azimuth propulsion devices.
I am not that knowledged in ship propulsion that I can do a good job.

Do you know any information sources where someone already compared the attached types of propulsion technologies?

I need some advantages/disadvantages in
- noise (inside water for fish observing)
- weight
- maneuverability
- efficiency
- sealing
and so on.

The level of efficiency part is the most difficult to me because I don't know the exact advantages and gainings of
- ducted props
- waterjet technology (stator + rotor)
- contrarotating props
- twin props (z-drive with 2 props on 1 shaft as fig. 1 in attachment)

Can you help me?

Thanks a lot!
Eggert

[eggert]

No idea?

Is there any other forum I can ask for this?

Thanks
Eggert