055 DDG Large Destroyer Thread

[dingyibvs]

So does anyone know exactly where the exhaust leaves from the Chinese CCL system? Since we have round missiles in square cells, can't the 4 corners of each cell be used for exhaust? That would be 20+% of each cell's volume being dedicated to exhaust without the missiles needing to shrink a millimeter. Would that be enough? If each missile were to be shrunken down to 0.71m diameter then some 45% of the volume of each cell could be used for exhaust.

 

[no_name]

Wouldn't that be too close to the missile that it might cook it when it comes out of the tube?

And if you want a tight fit of a circle in a square that does not leave a lot of area left for venting plus you need separation/insulated layer.

 

[Blitzo]

Proximity shouldn't bee that big if an issue considering how close traditional hot launch missiles are to their common vents.

As for insulation, well yes clearly a bigger missile with a bigger motor will both reduce the space available for venting and insulation while also needing more space for venting and insulation at the same time.
That is why there is probably a certain upper limit of missile size that can be hot launched from the PLAN VLS CCL style, and any bigger than that will probably be cold launched instead.

 

[no_name]

What about quad-packing? seems inefficient to put four missiles into a round tube so would they have a smaller square block inside the VLS tube and use a different venting layout. i.e. the new VLS tube can change missiles as well as vent arrangements?

 

[Blitzo]

What about quad-packing? seems inefficient to put four missiles into a round tube so would they have a smaller square block inside the VLS tube and use a different venting layout. i.e. the new VLS tube can change missiles as well as vent arrangements?

I imagine for different missiles and different missile loads (e.g.: quad packing) they will use different venting arrangements. Indeed it may be the case that each different cell load out will have its own unique self contained launch apparatus, I.e.: different CCL insulation/venting for different hot launch missiles, and different power cold launch mechanism for different sized cold launch missiles.

So in my mind, they have the 0.85m "un modified" cell width, and inside that square cross section, they can fit a variety of different hot launch missile cells each of which may have its outer shell act as the missile's insulation/venting shell while the surface of the full 0.85m cell width would also likely be designed to resist heat as well. Otoh for cold launch, the full 0.85m cell width will be used for a larger missile. Of course the inner surface of the cell will still be insulated and unchanged from the hot launch method, but it serves no function in cold launch.

I'm just speculating and wondering how the PLAN VLS may function most efficiently, there are probably other ways that are better.

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I wonder if having no common exhaust for the PLAN VLS means they can simultaneously fire multiple missiles from the same cell (or in quicker succession) than hot launch VLS with common vents, as there is no need to specially wait for missiles firing from the same 8 cell module to allow the vent to be "unoccupied".

 

[no_name]

I wonder if having no common exhaust for the PLAN VLS means they can simultaneously fire multiple missiles from the same cell (or in quicker succession) than hot launch VLS with common vents, as there is no need to specially wait for missiles firing from the same 8 cell module to allow the vent to be "unoccupied".

Maybe, but if assuming that a decent sized warship will probably have at least 32 missiles in one VLS section, and that means 4 missiles from different groups of 8 could be fired independently I doubt the difference is significant, except maybe if they want to consider mix and match of different missile types.

But what I think more important is that it eliminates the risk of venting hatch malfunctioning. With the CCL layout, if the hatch could not be opened, only the missile in question would be taken out of action. (The missile would be out of action anyway if the launch hatch could not be opened even if the vent hatch could)

 

[Blitzo]

Maybe, but if assuming that a decent sized warship will probably have at least 32 missiles in one VLS section, and that means 4 missiles from different groups of 8 could be fired independently I doubt the difference is significant, except maybe if they want to consider mix and match of different missile types.

But what I think more important is that it eliminates the risk of venting hatch malfunctioning. With the CCL layout, if the hatch could not be opened, only the missile in question would be taken out of action. (The missile would be out of action anyway if the launch hatch could not be opened even if the vent hatch could)

Yes, well there are definitely a few other factors mentioned for CCL that are safety/redundancy/cost related. Some of the publicly available patents attest to them.
I've also read that the individual CCL vent supposedly lasts longer than the common vent.

 

[no_name]

I've also read that the individual CCL vent supposedly lasts longer than the common vent.

That just reminded me that those vent could be replaced individually rather than affecting 8 cells. This may allow them to be made cheaper.

 

[yuxiaochen]

this information has basically been around for several years now. 052D was already launched last year. Do you have any additional information? Seems like nothing you got was confidential.

I dont think the general public (several other billion people) knows about this until recently, yes the 052D was out last year, I did mention that. even if i did know any more confidential information (which i dont), i wouldnt share it since it will most likely affect my family and obviously my country.

 

[Solaris]

I imagine for different missiles and different missile loads (e.g.: quad packing) they will use different venting arrangements. Indeed it may be the case that each different cell load out will have its own unique self contained launch apparatus, I.e.: different CCL insulation/venting for different hot launch missiles, and different power cold launch mechanism for different sized cold launch missiles.

I think it will have to be this way depending on the size and number of missiles. My question is once a cell has been burned up by a launch, can they recycle the cell or would they have to scrap it.