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acelanceloet
Post subject: Re: Multi purpose destroyerPosted: June 25th, 2012, 11:06 pm
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moving the hangar to another position won't help. the main things that weight a lot in a warship are the weapons, the radars, the engines and the liquids (fuel and water etc)
as the last 2 are deep down in the in the hull, mostly even below the waterline, it is the gun, VLS and the structure with the radars in it that you should be playing with. decreasing the superstructure width would help a lot, as your radars are then closer to the centerline and by that give less moment to your ship.
the hangar doesn't matter at all when you consider that you will only be moving the helideck down if you go for conventional. the basic weight will by that not be lower (unless you make the amount of aircraft smaller, this of course works too)

for the bow: an good idea would be to look at similar ships. the zumwalt is an good one.

if the seashadow is not yet done, you can of course take that :P for the zumwalt, well, they are building her already (I have seen construction pics) so I suppose her shape is pretty final. if it is not, you can update her later again for the definitive shape (hell, would not be the first time that happends, I have 2 ships like that laying around myself) IIRC, timothy has an good ref for her, and as I am working on some of her parts myself you can ask my help might problems arise too. your choice if you want, but with all her straight lines I have yet to see easier yet interesting ships. (I would do her myself, if she wasn't so damn fugly that I am afraid my screen might crack)

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Canopus
Post subject: Re: Multi purpose destroyerPosted: June 26th, 2012, 12:32 am
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Did a few correction.
[ img ]
Going to get drop box later...
Looks away better now, that Zumwalt forehead is indeed fugly. I changed the BFG to one of the originals, one should be enough these days. I reduced the Fire Scouts to three, changed the Hind for a Lynx but kept the Super Shitter, who knows when you need to send 55 marines to storm something or needs to haul 15 t of crap.

I'm reducing the maximun speed to...30-35 knots, that is what a Zumwalt is supposed to be making. But why not the pump jets?


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acelanceloet
Post subject: Re: Multi purpose destroyerPosted: June 26th, 2012, 7:36 am
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looking better already!
that bow thruster is a tad big, I suggest halving it's size.
waterjets become useful at as speed of 25-30 knots. that is not the speed you will constantly be making. also, they make a lot of noise. you could use them, but would it be effective? I don't think so.

btw, could we hope on an schematic top view? it doesn't have to be to scale, but I just want to see the shape of the structure, the VLS position and the outriggers :P

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travestytrav25
Post subject: Re: Multi purpose destroyerPosted: June 26th, 2012, 1:20 pm
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Very interesting concept.

I could be wrong, but I think you're using the Shipwreck missile in your drawing instead of the Brahmos. Also, the Brahmos is a really long missile. 24 of them might be a little too ambitious on your ship unless it's really wide, otherwise the Brahmoses would have to be pretty close to the centerline. Like Ace said, a top-down view would be really helpful to see how much hull space you have.


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Canopus
Post subject: Re: Multi purpose destroyerPosted: June 26th, 2012, 3:20 pm
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acelanceloet wrote:
looking better already!
that bow thruster is a tad big, I suggest halving it's size.
waterjets become useful at as speed of 25-30 knots. that is not the speed you will constantly be making. also, they make a lot of noise. you could use them, but would it be effective? I don't think so.

btw, could we hope on an schematic top view? it doesn't have to be to scale, but I just want to see the shape of the structure, the VLS position and the outriggers :P
Working on it; the VLS are a single row peripheral like on the Zumwalt and behind those lips on the hull. But they are slight inclined in order to use the extra space on the upper part of the hull, remember the upper hull is like on the Austal Next Generation Trimaran.

I'm not questioning you on the propulsion, as you obviously understand more about ships than I do, but aren't pump jets, not waterjets, extremely silent? I mean they are used on submarines, I liked the idea so i tried to adapt it unto a surface vessel hence the F-117 esque lamp shade/nozzle in order to preserve the hull shape and its relatively low draft.

On the missiles: Yes i'm using the P-700 from the parts sheet as a placeholder since I couldn't found a more modern hypersonic missile. The BrahMos is about 8.6m in length and the 3M-54 Klub is about the same length, I have 10m of hull above the water so I tough they would fit nicely.


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acelanceloet
Post subject: Re: Multi purpose destroyerPosted: June 26th, 2012, 3:28 pm
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first of all: air =/= water. you can't make it like it is on an F-117, because it doesn't work that way :P

waterjets are noisy, because they get water in, turn an prop through the stream, and push it out. in an normal setup you only have the prop.
waterjets are very useful for low draft ships though, because they can be placed on or just below the waterline just fine.
submarines use shrouded propellors though, IIRC

for the VLS: keep an eye in the fact that you seem to have VLS on your outrigger platforms, which are not as deep as the hull. take a look at the mk 41 in the belowdeck parts thread so you can see where it fits, but I think you will have to make sure all missiles are in the hull itself, in which you have limited space because of the gun (well more because you can make your actual hull shallower because of the outriggers)

on the point that I know more :P might be true, I am currently studying to become an shipbuilding engineer ;)

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Canopus
Post subject: Re: Multi purpose destroyerPosted: June 26th, 2012, 4:00 pm
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acelanceloet wrote:
first of all: air =/= water. you can't make it like it is on an F-117, because it doesn't work that way :P

waterjets are noisy, because they get water in, turn an prop through the stream, and push it out. in an normal setup you only have the prop.
waterjets are very useful for low draft ships though, because they can be placed on or just below the waterline just fine.
submarines use shrouded propellors though, IIRC

for the VLS: keep an eye in the fact that you seem to have VLS on your outrigger platforms, which are not as deep as the hull. take a look at the mk 41 in the belowdeck parts thread so you can see where it fits, but I think you will have to make sure all missiles are in the hull itself, in which you have limited space because of the gun (well more because you can make your actual hull shallower because of the outriggers)

on the point that I know more :P might be true, I am currently studying to become an shipbuilding engineer ;)
Perhaps I'm using the wrong terminology, or I really need to update my knowledge on maritime propulsion. I picked the idea from a pump jet on submarines after taking a pic at this:
[ img ]

I'm inclining the VLS so while their tip is at the outermost part of the deck their base would sat more or less where they do on a Zumwalt. I will make a cross section too, if that doesn't work let's just say they sit where they sit on a Zumwalt but with more deck to the sides.


I'm studding mechanical engineering, I'm more the engine, gearbox and firearm guy but I always liked ships but It's no where near what I'm aiming for.


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travestytrav25
Post subject: Re: Multi purpose destroyerPosted: June 26th, 2012, 4:27 pm
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Yeah, submarine pumpjets are a type of shrouded propeller, they don't have a water tunnel that the water is sucked through. Your design looks more like a waterjet. Waterjets also have to have a reversing nozzle or reversing bucket in order to move the ship in reverse, which yours doesn't appear to have.


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Canopus
Post subject: Re: Multi purpose destroyerPosted: June 26th, 2012, 6:41 pm
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You see the lower flat encasing the vanes? Now imagine the vanes close and that flap opens, there you have my reverse. I'm probably going to change it; any suggestions on a proper shrouded screw, or should I go with a standard screw?

Upper view:
[ img ]


That superstructure still looks too massive...

I'm going to make the cutaway of the bow section later, but imagine that the main hull is 20 m wide and the whole layout is like this but a lot more flatter:
[ img ]


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acelanceloet
Post subject: Re: Multi purpose destroyerPosted: June 26th, 2012, 11:31 pm
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aaah, and here I see the problem I thought there would be: the VLS will not fit in that part of the hull, especially not brahmos :P
the solution is simple: there are 2 options:
- use regular, mk 41 8 cell blocks on the centerline
- use the zumwalts missile system, but place them so they are placed in the central hull instead of the outriggers.

the structure looks about right in size, now research which radars you want in it and how your exhaust is set up ;)

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