SSK Diesel/Electric Sub Thread (AIP too)

SamuraiBlue

SamuraiBlue

Captain
One question about the to be built Australian short fin Barracuda class I have is, how good will a pump jet work on conventional diesel electric power?

The propeller on a pump jets are smaller 1/2~2/3 compared to open propellers so I believe it is also rotating faster to gain the same thrust even if the casing vectors the side wash to the rear exit.

The subs that have pump jets that I know of are powered by nuclear reactors so they have no problem in power out put but a diesel electric during submerged endurance runs the sub at low speed to conserve batteries.

Now if it requires to spin the propellers faster then conventional propellers then it's going to use up the charged amount of electricity within the batteries meaning it will require to snorkel more frequently.

This is purely an assumption on my part but does it make sense?
 
Last edited by a moderator:
Jeff Head

Jeff Head

General
Registered Member
SamuraiBlue said:
One question about the to be built Australian short fin Barracuda class I have is, how good will a pump jet work on conventional diesel electric power?

The propeller on a pump jets are smaller 1/2~2/3 compared to open propellers so I believe it is also rotating faster to gain the same thrust even if the casing vectors the side wash to the rear exit.

The subs that have pump jets that I know of are powered by nuclear reactors so they have no problem in power out put but a diesel electric during submerged endurance runs the sub at low speed to conserve batteries.

Now if it requires to spin the propellers faster then conventional propellers then it's going to use up the charged amount of electricity within the batteries meaning it will require to snorkel more frequently.

This is purely an assumption on my part but does it make sense?
Click to expand...
Well, just off the cuff this may be so...but on the other hand, the DE is not expected to have the speed of the SSN, so less power will be required in any case.

Finally, although I personally believe that an Australian Soryu would have been the best choice, the French are also very good, and DCNS will produce a fine product to Australian specs.

They will get a very good sub...with the potential of adding some nuclear ones later.
 
S

schenkus

Junior Member
Registered Member
Jeff Head said:
Well, just off the cuff this may be so...but on the other hand, the DE is not expected to have the speed of the SSN, so less power will be required in any case.
Click to expand...

I think the question is more about efficiency at low speeds. I would assume the power needed is related not directly to the speed of the propeller, but to the amount of water moved by the propeller.

I don't know if the pump jet is as efficient at slow speeds as a normal propeller, but the australians have certainly taken a close look at this.
 
FORBIN

FORBIN

Lieutenant General
Registered Member
They consider only SSN sure in service no 093G, 5 is good.

But wrong for AIP in Asia much more but interesting numbers on 25 years for get an idea.
Asia SSK AIP 2015 : China 14, Japan 7, Singapore 2 : 23
 
Last edited:
You must log in or register to reply here.
Top