Please help me with my school project

[deier]

Hello guys, I am new here. I study Naval Architecture in my country and I need your help for a project. I never worked a project with a kaplan propeller, only B-waggeningen, but now I am required to for a tractor tug. I chose a propeller with a dwg (to see if it fits under) and i have a Dp=2106mm,T=263 Kn,n=273rpm,z=4 blades.Its fixed pitch propeller. There are 2 propellers.
Now I need to find what engines do I need and other characteristics of the propeller like Ae/A0,P/D and so on.
The tug needs to develop a 50Tbp bollard pull.
Thanks!

 

[hoytedow]

Tug skipper shared this info with me:

 

[hoytedow]

More:

 

[hoytedow]

He is known on this forum as Yobarnacle.

 

[hoytedow]

From that info I gather each engine to be 2500 hp.

 

[johneck]

The rule of thumb about right, so you need approx 2500 HP/shaft to get to 50 MT; maybe a bit less with a Tractor tug. How did you arrive at 273 RPM? This is probably not very workable with that RPM/Diameter combination. The power is pretty high for that diameter, so to manage blade loading you are probably better off with a higher RPM.