making the Seawolf silent speed of 25 knots and doubling the Kilo endurance

[Castout]

I'm trying to make the Sewaolf much more realistic with having a virtually silent speed of 25 knots. Furthermore I'm trying to double the Kilo submerged endurance. thus making it more realistic.

I'm using the DWedit utility and playing with the object.eod file.

There is an object called thruster.

For the Kilo I think I just add 1 identical thruster but one which is NOT emitting any noise at all by tinkering with the speednoise parameter value of the object thruster class.

For the Seawolf I think I'm going to tinker with the speednoise value.

However I think the bigger the number of the speednoise parameter the quiter the sub becomes.

What does this speednoise mean? I mean the Seawolf has a speed noise level of 18 while the Kilo SSK has a speed noise of 11 and the Kilo improved has a speed noise of 13.
There is also the base noise which is always set at 0 I think.

Some help on the speednoise meaning is appreciated. Thanks

[Castout]

I just found a weird thing.

I've made sure that the object.eod is not read only and proceeded to make the changes I wrote in the previous post.

I loaded DW with the modified object.eod and it loaded and played successfully however as I exit DW to make further adjustment to object.eod file with DWedit, the previous modifications I've made disappeared from the list. The file seemed to have returned to default state.

Anybody have any idea?

[To be]

Did you save?

[Castout]

Originally Posted by To be

Did you save?

Gosh I had to? I did click on the apply button.

[LoBlo]

SpeedNoise in the thruster dialog represents how much additional "noise" the platform emits at top speed. For example a SpeedNoise of 10 means that at top speed the platform emits (base sound levelnoise) + 10 additional noise points. A SpeedNoise of 20 means the platform will emit (base sound level) + 20 additional noise points.

The lower the value the less additional noise at top speed the platform will exhibit.

If you want to lower the overal noise of the platform its in the "object" dialog in the valuebox Passive Sonar SL.

I loaded DW with the modified object.eod and it loaded and played successfully however as I exit DW to make further adjustment to object.eod file with DWedit, the previous modifications I've made disappeared from the list. The file seemed to have returned to default state.

After you change a value in one of the dialog, be sure to press the "apply" button, or the changes will be discarded when you switch to a different platform (different than the save button).

[Castout]

Originally Posted by LoBlo

SpeedNoise in the thruster dialog represents how much additional "noise" the platform emits at top speed. For example a SpeedNoise of 10 means that at top speed the platform emits (base sound levelnoise) + 10 additional noise points. A SpeedNoise of 20 means the platform will emit (base sound level) + 20 additional noise points.

The lower the value the less additional noise at top speed the platform will exhibit.

If you want to lower the overal noise of the platform its in the "object" dialog in the valuebox Passive Sonar SL.

After you change a value in one of the dialog, be sure to press the "apply" button, or the changes will be discarded when you switch to a different platform (different than the save button).

Thanks LoBlo. Btw do you think the virtual thruster is going to work to double the Kilo endurance?

[Castout]

This time I saved the changes I made and now my Seawolf is virtually undetectable like it is supposed to be in RL thanks to its pump jet propulsion system. . It is still detectable but at flanking speed that is in excess of 25 knots and at relatively short ranges too. I really like it this way. I don't care if it ruins the gameplay. As far as I'm concerned the Seawolf is supposed to be invisible. The ultimate underwater stealth technology. Though I'm a bit afraid that now whatever mission or campaign with the Seawolf would be all too easy since the enemy is not going to be able to detect it unless it is very very lucky. Though I'm aware there is always the probability that the Seawolf actual performance is not as superb as what they told us to be. Disinformation is commonplace and can be expected from the military though they usually dumbed down the performance of their new wonder machines.

The quietness of the Seawolf makes me wondering about the real or disclosed stealth performance of the Trafalgar which has a pump jet propulsion too like the Seawolf.
Does anyone know whether the Trafalgar is nearly as quiet as the Seawolf? :hmm:Because I intend to lower Trafalgar noise further since I expect it to be quieter than a conventional propeller equipped submarine.

I also tried playing with what I call the virtual thruster. Instead of doubling the range it actually halved it. Maybe it is not possible at all to double the endurance of the Kilo as what I've been told.

[To be]

Originally Posted by Castout

This time I saved the changes I made and now my Seawolf is virtually undetectable like it is supposed to be in RL thanks to its pump jet propulsion system.

Well to be honest the Seawolf (in LWAMI) is perhaps slightly undermodeled, but not terribly so I imagine. You certainly can't go running around at 25 knots and expect not to be detected. It is good, and one of the best subs in the world (I would guess it is pretty much equivilent to the Virginias) but it just isn't that good.

Additionally, the pump-jet is quieter, but not silent, and has been used on other subs besides the seawolf, such as the British Trafalgar class. So in reality you probably made the sim highly unrealistic.

[Castout]

Originally Posted by To be

Well to be honest the Seawolf (in LWAMI) is perhaps slightly undermodeled, but not terribly so I imagine. You certainly can't go running around at 25 knots and expect not to be detected. It is good, and one of the best subs in the world (I would guess it is pretty much equivilent to the Virginias) but it just isn't that good.

Additionally, the pump-jet is quieter, but not silent, and has been used on other subs besides the seawolf, such as the British Trafalgar class. So in reality you probably made the sim highly unrealistic.

Well I have read somewhere that at 25 knots the Seawolf is quieter than a Los Angeles class tied at pier. In DW it is stated to have a silent speed of 25 knots. 10 times as quiet as the improved Los Angeles class submarine and 70 times as quiet as the original Los Angeles class submarine.
So I expect it to be as quiet as a 5 knots Los Angeles class when running at 25 knots. And that is extremely quiet imo.
So it must have extremely advanced stealth performance.

But again the military are also known to have exaggerated its wonder machine performance in order to win continuous funding to help justify its enormous expenses.

But I intend to further play with the parameter. Maybe I need to increase the passive noise a bit.

I realize this is all just guessing but I really think the default LWAMI Seawolf performance is really undermodeled. I don't feel confident riding the Seawolf in its default LWAMI state.

[TLAM Strike]

[quote=To be]

Originally Posted by Castout

Additionally, the pump-jet is quieter, but not silent, and has been used on other subs besides the seawolf, such as the British Trafalgar class.

Not to mention the Russian Kilo submarine Alrosia.

BTW a pumpjet is not as efficent as a normal prop so if you had two submarines of the same class and one was outfitted with a pump jet it would be eather slower and quieter or noiser due to the higher amount of turns being put on the shaft for the same speed. Pump jets make a sub quieter but at slower speeds, they are by no means a HFRO style "Silent Drive".

[LoBlo]

Originally Posted by Castout

Btw do you think the virtual thruster is going to work to double the Kilo endurance?

Not likely. From what I've seen/tried, its in the hardcode of the engine itself... if anyone ever figures out the trick it would make a nice Type 212 with AIP.

[Pillar]

I gathered that the Seawolf was marginally quieter than contemporary 688i's at slow speeds but without cavitation at higher speeds, and that's it.

How does the pump jet work sound-wise? I know what they are but I haven't a clue about the acoustics.

[Castout]

Originally Posted by Pillar

I gathered that the Seawolf was marginally quieter than contemporary 688i's at slow speeds but without cavitation at higher speeds, and that's it.

How does the pump jet work sound-wise? I know what they are but I haven't a clue about the acoustics.

Yes you're right pump jet prevent cavitation. I'm still looking at which parameter to change so that the Seawolf would not be cavitating at high speed.

Right now it still cavitates at 25 knots at relatively shallow depths but it is nonetheless virtually undetectable