Type 055 DDG Large Destroyer Thread

11226p

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A close up of the universal VLS via the yukikaze guy on twitter, person for scale. Could not find the image without the quote so my apologies. In case the quote is significant could someone that speaks chinese translate it?

Edit:Added an image of a Mk41 VLS with humans next to it to give an idea of relative scale
 

ZeEa5KPul

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Interesting. The Mk 41 seems closer the 054A VLS than the 055's

both in size (at least length and width) and configuration. The "usable" volume of the UVLS on the 055 might be a little less than it appears since the gas venting has to take up some volume along the inner walls the cell instead of passing the missile exhaust through a flame trench.
 

Bltizo

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Interesting. The Mk 41 seems closer the 054A VLS than the 055's

both in size (at least length and width) and configuration. The "usable" volume of the UVLS on the 055 might be a little less than it appears since the gas venting has to take up some volume along the inner walls the cell instead of passing the missile exhaust through a flame trench.
I think it's been established for a while that the Mk-41 VLS and the 054A VLS are very similar in configuration and deckspace footprint, but always good to review it.

For the UVLS, it is capable of hot and cold launch;
- For hot launch, it is via a concentric canister launch method where the vent is within the cell itself, and as you correctly point out it causes the effective cross section of each VLS to be reduced for the venting. YJ-18 is launched via this method.
- For cold launch however, they should be able to use the entire cross section of each VLS, while at the cost of reducing the length slightly by having a cold launch mechanism eject it out of the cell. That means they can still use up the vast majority of the length of each cell (particularly the 9m long variant), and the entirety of each cell's cross section (area) as well, allowing the diameter of a missile payload to theoretically be able to use the whole VLS' cross section.


Allowing for both hot and cold launch really is the best of both worlds.
 
I think it's been established for a while that the Mk-41 VLS and the 054A VLS are very similar in configuration and deckspace footprint, but always good to review it.

For the UVLS, it is capable of hot and cold launch;
- For hot launch, it is via a concentric canister launch method where the vent is within the cell itself, and as you correctly point out it causes the effective cross section of each VLS to be reduced for the venting. YJ-18 is launched via this method.
- For cold launch however, they should be able to use the entire cross section of each VLS, while at the cost of reducing the length slightly by having a cold launch mechanism eject it out of the cell. That means they can still use up the vast majority of the length of each cell (particularly the 9m long variant), and the entirety of each cell's cross section (area) as well, allowing the diameter of a missile payload to theoretically be able to use the whole VLS' cross section.


Allowing for both hot and cold launch really is the best of both worlds.
Is there any other VLS system that can do both hot and cold ?
 

Bhurki

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Total UVLS in various stages of construction and service ~2500
25 x 64 (052d) - 1600
8 x 112 (055) ~ 900

Its about time someone thought of quad packing these things with medium range, cheap SARH missiles.
Dimension limitations will be
Diameter = <30 cm
Length = <5m
Weight = 350-400 kg
Warhead = 30-40 kg
Whats the closest existing missile to this configuration?
 
Last edited:

Bltizo

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Is there any other VLS system that can do both hot and cold ?
Technically any VLS that can hot launch a missile can also cold launch a missile.
However, for VLS that use a common venting system for hot launch (Mk-41, SYLVER, or Mk-57 etc), if you cold launch a missile you don't get the extra VLS cell cross section benefits that the PLAN's UVLS design has when cold launching a missile.



Total UVLS in various stages of construction and service ~2500
25 x 64 (052d) - 1600
8 x 112 (055) ~ 900

Its about time someone thought of quad packing these things with medium range, cheap SARH missiles.
A quad packable missile has already been rumoured to be in development for the last few years.
I also think such a missile should be ARH.

But given the way that missile development and armament in a ship's VLS is, I suspect it will take months or years after a new missile enters service for us to get pictures or videos confirming it.
 

ZeEa5KPul

Junior Member
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- For hot launch, it is via a concentric canister launch method where the vent is within the cell itself, and as you correctly point out it causes the effective cross section of each VLS to be reduced for the venting. YJ-18 is launched via this method.
Maybe not - or not by a lot. Just by dint of launching circular (cylindrical) missiles from square cells means there's some unused volume to play with (around 21.4% or (1 - π/4)*100 of the volume of the cell). Perhaps that's enough to safely vent the exhaust gas without damaging the missile/cell. They're not directly comparable, but the Avangard test launch shows a characteristic "four corners" venting pattern that would be expected from such a configuration.
 

Bltizo

Moderator
Staff member
Maybe not - or not by a lot. Just by dint of launching circular (cylindrical) missiles from square cells means there's some unused volume to play with (around 21.4% or (1 - π/4)*100 of the volume of the cell). Perhaps that's enough to safely vent the exhaust gas without damaging the missile/cell. They're not directly comparable, but the Avangard test launch shows a characteristic "four corners" venting pattern that would be expected from such a configuration.
I don't think we can make any estimate as to the degree of venting (and degree of VLS cross section reduction) that a given missile of any size would need tbh, though I'm sure that attempts to maximize the space available for a missile would be done.
 
Total UVLS in various stages of construction and service ~2500
25 x 64 (052d) - 1600
8 x 112 (055) ~ 900

Its about time someone thought of quad packing these things with medium range, cheap SARH missiles.
Dimension limitations will be
Diameter = <30 cm
Length = <5m
Weight = 350-400 kg
Warhead = 30-40 kg
Whats the closest existing missile to this configuration?
I thought the limitation is mainly on Diameter. Why would you put some other limitations i.e length, weight and warhead ?
 
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