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Thread: Warships

  1. #201
    Bartholomeus Crane's Avatar
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    Quote Originally Posted by Liare View Post
    depends on size, on schooner sized vessels rerigging between Sloop, Cutter Yawl and Ketch type vessels would be a fairly trivial exercise, the main difference being the number of fore sails, and the addition or removal of a smaller rear mast, that unlike the main one, was not integral to the ships design (though some no doubt where)

    likewise, moving between Brig and Brigantine rigging the alterations are still relatively minor, when you move up to fully rigged ships its a completely different ball game, but why on earth would you want to Latneen rig a frigate sized ship anyway ? the only way to make a ship of that type remotely workable for a reasonably sized crew is to full rig it.
    Apples and banana's again.

    Take two very similar sail-plans on two very similar ships, and the move from one to the other or vise versa isn't very difficult. No shit Sherlock. But we weren't talking about two very similar sail-plans on two very similar ships now were we? The difference isn't about the number of foresails, it is about completely redoing a mast, one integral to the whole ship design. That means moving, removing, or extending the mast, the rigging to keep it in place, putting a very different sail-plan on top, and then still making with work within the hull. It is not the same as changing the oars on a row-boat! Unless you have very similar ship designs, like a sloop, cutter, or ketch, you cannot easily re-rig a ship 'as required'. And we weren't talking about sloops, cutters, ketches or rowboats. We were talking about sizeable ships that differ in hull design significantly. You know, yachts, Carracks, Galleons, Fluyts ...

    both Caravels and Carracks are a mostly Mediterranean thing, not sure why you are obsessing so much over them, the Scandinavian nations build mostly galleon type ships until switching to the "modern" square rigged three master for their ships of the line and Indiaman type vessels, everything else was done in schooner and snow sized ships, or smaller.

    ironically that's why both the danish and swedish navies where historically so sluggish to get into things, rounding up the crews from the large number of trading vessels could take several months at the best of times, and up to a year in some cases.
    I bring them up because that is what the Spanish and the Portuguese were sailing at the time of the Duyfken! And long after as well. And not just in the Mediterranean either. Their Galleons were their small faster ships (still outclassed but there you go).

    comparing Fluyt to Carrack is disengenious at best, the two designs are separated by roughly 200 years, certainly the Spanish kept building them, but up until the late 1700's but then they where still making Galleons, despite these ships being hilariously outperformed by everything else.

    its more reasonable to compare it to Indiaman type vessels, but there's so many variations of that one that it's not even funny, and most larger Fluyts can be considered part of the same class of vessel, their distinctive feature that makes them stand out being the "Baltic deck" needed for passage past Denmark.
    Compare it to an "Oostindievaarder"? Man, what are you talking about? The Indiaman is the East-Indies version of the Fluyt! It ditched the Baltic deck for a wider poop and weather deck, and early Indiamen were practically indistinguishable from Fluyts. Fluyts, furthermore, pre-date Indiaman, as the Baltic Merchant fleet for the Dutch existed well before they went to the Indies. You know, there's a reason why they're officially called 'East Indiamen': the East-Indies are what now is Indonesia, a former Dutch colony! The Dutch designed the early Indiamen off the Fluyt, or their common ancestor, the yacht.

    It is useless to compare something to itself: you won't find much difference. But it is perfectly reasonable to compare Fluyts or Oostindievaarders to Carracks, because that was what the Spanish, in the early years the biggest merchant navy in the world, were using for cargoships. And there's a massive difference between the two designs. In hull design. Sailplan. Usage. Basically everything.

    the Mary rose certainly sharequite a few of the lines.

    the same design, not at all, try comparing the Dufken, the Golden Hind and a "modern" flush decker like the Constitution, see what i am on about now ?
    So now the Mary Rose and the Duyfken are also the same design?

    Listen: they are completely different ships, used for completely different purposes, and it shows in the design! The Mary Rose, the Golden Hind, the Duyfken: completely different ships from each other!

    Even before flushdeck ships like frigates (also a Dutch design BTW) came round, there were really different ship design philosophies around.

    The Spanish didn't keep building Carracks because they couldn't think of something else to build! They didn't much care about speed or handling or even having to wait for favourable winds. They needed to get massive amounts of gold and cargo from their colonies in South-America safely across the Atlantic back to Spain. So they had massive ships, with lots of heavy (short ranged) guns and soldiers, with a lot of cargo space, and a lot of protection, sailing in convoy: the Silverfleet, or La Flota. These were constantly prayed upon by privateers, pirates, and the Dutch, French, and English, and not least the weather. But you would be an idiot (or Piet Hein, one of the most successful privateers ever) to try to tackle La Flota head on! The whole design of those ships was slow and defensive. And that includes hull, sailplan, armament and crew complement.

    The Dutch, English, French? They needed fast, manoeuvrable ships to either hunt those Spanish ships, or to quickly get to the East-Indies (or elsewhere), get the spices, china, whathaveyou, and then quickly back again. The longer it took, the less money was made. So their whole design philosophy was different. Speed, agility, longer range guns, smaller crews. That gives you completely different ship designs!

    And that resulted in ships floating about with completely different designs. Concurrently. For a reason. For the same reason that you wouldn't arm a Duyfken with a demiculvert, you wouldn't chop off the excellent fire platform of the high forecastle from a Carrack (or a Spanish treasure fleet Galleon).

    To say that somehow all those ship designs are, really, all the same until flushdeck ships came round is just ... stupid.

    Here, have a picture of a replica of a late version Oostindievaarder; "Amsterdam":


    Here, have a picture of a replica of the Carrack Santa Maria:


    Sure, exactly the same design right? Nooooo difference whatsoever!

    Apples and bananas ...

  2. #202
    Keorythe's Avatar
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    Quote Originally Posted by dpidcoe View Post
    Quote Originally Posted by Paradox View Post
    Well someone was going to say it eventually so I will: With better linear motors like we see in EMALS there's potential for a hypothetical railgun armed battleship finding it's way into naval tactics in the future if railgun projectiles are found to posess superiour characteristics to cruise missiles.
    Also, railgun projectiles are definitely superior to cruise missiles (cost, speed, and safety being the big ones) at ranges <600 miles. And since most of the lethality comes from the kinetic impact, you can pack the interior of the thing with guidance electronics to make minor course corrections (no explosives to displace).
    Naval shells relied heavily on the explosive package inside of them to damage the interior of a ship. If you can pepper the thing with a lot of rounds of pure kinetic in a short period of time then ok maybe it will be somewhat effective assuming you're trying to take the other ship out of the fight.

    This is the armor piercing tip of a 16in shell. Notice the fragmentation of the rear from the explosives package. Now imagine something like that going off INSIDE of a ship. Compare that to a kinetic round punching a hole and getting a variable amount of spalling.

  3. #203
    Synapse's Avatar
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    "Anchor's Aweigh" playing in my head as I read this thead. Can't find my favorite BB picture. So i'm posting this instead.



  4. #204

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    Quote Originally Posted by Keorythe View Post
    Naval shells relied heavily on the explosive package inside of them to damage the interior of a ship...
    Once you hit mach 10 you don't need explosives. Kinetic energy at that point is equal to the energy released by an equivalent mass of TNT. Railguns be mad science. If railguns proliferate we'll end up with a situation whereby having armor, designed to absorb (and therefore release) kinetic energy, will be detrimental to a ship's chances of survival.
    Last edited by elmicker; July 23 2012 at 09:30:28 PM.

  5. #205
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    Quote Originally Posted by elmicker View Post
    Quote Originally Posted by Keorythe View Post
    Naval shells relied heavily on the explosive package inside of them to damage the interior of a ship...
    Once you hit mach 10 you don't need explosives. Kinetic energy at that point is equal to the energy released by an equivalent mass of TNT. Railguns be mad science. If railguns proliferate we'll end up with a situation whereby having armor, designed to absorb (and therefore release) kinetic energy, will be detrimental to a ship's chances of survival.
    MATH TIME!

    A 16" HE shell from an Iowa-class battleship has a mass of 862kg, which includes a bursting charge of 69.67kg of Ammonium Picrate. It fires at a muzzle velocity of 820 m/s, and Ammonium Picrate has very similar explosive characteristics to TNT (about 113% of the energy, but lower brisance), TNT has an explosive equivalence of about 4500 J/g.

    Thus, a 16" shell has a Kinetic Energy of 2.89x10^8 J and an explosive energy of 3.14x10^8 J for a total of 6.04x10^8 J.

    The railgun most recently demonstrated on youtube (Here) has fired at 33 MJ (or 3.3x10^7 J) and is expected to scale up to firing a 3.35kg projectile at 5800 m/s (for a total of 5.63x10^7 J).

    Thus, the 16" gun has about 10x the energy of a current railgun... BUT the railgun is firing a projectile that is about 1/250 the size. To match energy, the railgun would only need to fire a projectile weighing 36kg.

    Not only that, but the railgun would be way more accurate, and have a much farther range.

    (Note: this does not include damage assessment upon impact, nor does it include the fact that a 16" is way overkill - hence, the Iowas have been decommissioned.)
    Very funny, Scotty, now beam down my pants.

  6. #206
    Keorythe's Avatar
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    Quote Originally Posted by shaewyn View Post

    (Note: this does not include damage assessment upon impact, nor does it include the fact that a 16" is way overkill - hence, the Iowas have been decommissioned.)
    16in guns were removed from inventories because they became obsolete and developed cruise missiles. While they packaged a punch they fired in one direction and required a forward observer or drone to tell if they in fact hit the target and then have them give constant updates for fire adjustment. A rail projectile wouldn't have that ability. At best maybe some inertia guidance. And like many other high speed lightweight projectiles, it would bleed speed pretty rapidly after it crossed a certain threshold.

    Cruise missiles aren't much larger than the shell and powder together. However, while slower, they can fly nap of the earth using GPS or terrain following guidance, can fly past another target to drop a double load of submunitions painted with baby american eagles giving the middle finger, has enough power generation to run some amped up speakers and play "American FUCK YEAH", then do a 90degree turn, dash through a valley and blow up the main target with it's large penis shaped warhead. And if the target moves or a bus of nuns/kids/greenpeace shows up at the site, the commander can say NOPE, go here and take out target B. Some versions come with all cluster bomb munitions or tactical nukes for added hippy rage. Did I mention you can launch some long types from destroyer sized ships?

    Destroyer USS Ladsen loading a Tomahawk


    Indian Destroyer INS Mysore firing off a pair of Switchblade cruise missiles


    MOTHERLAND! Russian Sovremenny class destroyer and SS-N-22 Sunburns

  7. #207

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    One critical problem with a kinetic projectile is that you have to get it to transfer energy to the target and not punch right through. I'm sure it is possible to solve the problem, I just wonder how. Perhaps a bursting charge to pepper the target with fragments?

  8. #208
    shaewyn's Avatar
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    Quote Originally Posted by Keorythe View Post
    Quote Originally Posted by shaewyn View Post

    (Note: this does not include damage assessment upon impact, nor does it include the fact that a 16" is way overkill - hence, the Iowas have been decommissioned.)
    16in guns were removed from inventories because they became obsolete and developed cruise missiles. While they packaged a punch they fired in one direction and required a forward observer or drone to tell if they in fact hit the target and then have them give constant updates for fire adjustment. A rail projectile wouldn't have that ability. At best maybe some inertia guidance. And like many other high speed lightweight projectiles, it would bleed speed pretty rapidly after it crossed a certain threshold.

    Cruise missiles aren't much larger than the shell and powder together. However, while slower, they can fly nap of the earth using GPS or terrain following guidance, can fly past another target to drop a double load of submunitions painted with baby american eagles giving the middle finger, has enough power generation to run some amped up speakers and play "American FUCK YEAH", then do a 90degree turn, dash through a valley and blow up the main target with it's large penis shaped warhead. And if the target moves or a bus of nuns/kids/greenpeace shows up at the site, the commander can say NOPE, go here and take out target B. Some versions come with all cluster bomb munitions or tactical nukes for added hippy rage. Did I mention you can launch some long types from destroyer sized ships?
    Nice 1000th poast

    Yep, the cruse missile has the advantage of target switching or self-destructing (i.e. after-fire abort). The other stuff... cruise missiles would also need a forward observer/drone/etc. to paint a moving target. Accuracy of a kinetic round now is actually staggeringly good (i.e. shooting 40km and hitting a target the size of a car is commonplace for land artillery), and would actually be better for a railgun, as the projectile is travelling much faster. The current railguns are expected to have an accuracy of 5m at 370km distance.

    Now, cruise missiles are about twice the size of a 16" projectile and propellant... but compare that cruise missile box to a rail gun projectile, which would be about the size of your forearm. Also, the cruise missile costs millions of dollars, but a metal rod (even finely machined) is nowhere near that price. You could fire thousands of rail gun projectiles for the cost of one cruise missile (not counting rail wear). For that price, you don't need multi-target capability, as you can just fire at all the targets you want.

    As for GPS guidance and nap-of-the-earth flying? Why do cruise missiles do that? For stealth and to penetrate anti-air defences (i.e. not get shot down). A rail gun projectile has neither problem - it's a small projectile (and thus difficult* to see on radar), and it's immune to air defences.

    It's also important to realize the speed difference between a railgun projectile and a cruise missile. A TLAM-C cruise missile has a range of 1700km and a top speed of 880km/h. That means it would take ~2 hours to reach it's target. Using simple ballistics, a railgun projectile fired at 5800 m/s at an angle of 45 degrees would have a range of 1714km (not accounting for drag) and would reach the target point in less than 7 minutes. At the goal of 370 km, again not accounting for drag, the railgun projectile would take about 60 seconds to reach it's target. That's quick. Actually, and kind of amusingly, a perhaps unseen advantage of cruise missiles is that a railgun projectile travels so fast, and with such a flat arc (to get 370km range at 5800m/s, they'd need about a 4 degree angle of elevation!) that mountains would get in the way! You could sit in Reno, Nevada, and a ship with a railgun outside of San Francisco would have the range to reach you, but the Rockies would be in the way!

    Also, iirc, the plan is to mount the railguns on destroyers as well. Ultimately, however, I would expect a destroyer to carry both railguns and cruise missiles

    Quote Originally Posted by Ort Lofthus View Post
    One critical problem with a kinetic projectile is that you have to get it to transfer energy to the target and not punch right through. I'm sure it is possible to solve the problem, I just wonder how. Perhaps a bursting charge to pepper the target with fragments?
    Yes, a bursting charge (or more likely, just jettison submunitions, not that hard to get them to spread out).

    The problem of how the energy transfers is actually a really thorny one, but suffice it to say, it's not nearly as simple as "punches a nice neat hole". I'll have to go read up more on what happens with high-energy impacts to give a better answer.
    Last edited by shaewyn; July 24 2012 at 08:12:51 AM.
    Very funny, Scotty, now beam down my pants.

  9. #209

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    Can you get around the "punches straight through" problem of kinetic shells by using DU?

  10. #210
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    Quote Originally Posted by Rodj Blake View Post
    Can you get around the "punches straight through" problem of kinetic shells by using DU?
    That would make the problem worse wouldn't it? We use DU for penetrating sabots because they're bad at transferring energy and good at punching through armour.

  11. #211
    Bartholomeus Crane's Avatar
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    Quote Originally Posted by Paradox View Post
    Quote Originally Posted by Rodj Blake View Post
    Can you get around the "punches straight through" problem of kinetic shells by using DU?
    That would make the problem worse wouldn't it? We use DU for penetrating sabots because they're bad at transferring energy and good at punching through armour.
    No, DU is used because it has high mass with little volume. So lots of kinetic energy in a small package. DU is actually quite 'soft' compared to other materials. But that doesn't matter because its high kinetic energy is transferred onto a small surface, so it'll get through.

    None of this matter at Mach 10 anyway. You could use a brittle substance which would shatter on impact or just before impact. The shards themselves would still have enough kinetic impact to do lots of damage over a wider area. Bit like a shotgun blast. But we're talking about a small projectile to begin with, so how feasible that would be?

    Not that it matters, as railguns won't see a practical use in any navy in 20 years, if ever. And laser defense? Pffff, same deal. Who knows what missiles will be capable of by then. All useless pipedreams if you ask me. Old fashioned high explosives and missiles are far more efficient, effective, and useful, and I guess will remain so for years to come.

    And anyway, the future of naval warfare is underwater:

  12. #212
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    guys? should i fit an additional sail to my boat for speed or should i fit for 2 more cannons for more alpha. i heard the cap is pretty rough this year and the spains are outsailing mah boat all the time.

  13. #213

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    Fit a few rowers onto your mid-decks to give you a good burst of speed, fill the high-decks with autocannons and put loads of armor plate + a damage controller on your lowdecks. Any room left on your lower decks I recommend putting a gyroscopic stabiliser to improve your cannon's performance.

    Or you can replace your lowdecks with a mixture of lightweight composite structural elements and a tracking spotter to let you dance around outside your targets close range, although alls you need is some fucker to get a boarding chain on you and you're fucked. Also this just doesn't seem to go as fast as it used to for some reason, guess the water is a bit thicker these days.

  14. #214
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    Quote Originally Posted by Frug View Post
    Quote Originally Posted by dpidcoe View Post
    Not quite. The speed of a railgun projectile (~mach8 at muzzle) is plenty for wacking missiles and planes, especially with a fragmenting projectile. Also, raytheon got the free electron laser contract iirc, so I don't have very high hopes for it
    Forgive my naive position but I would assume the ROF on a railgun is pretty bad and you don't want to use something that gets one shot to snipe something out of the air when you could hit it with something like a laser.
    The ROF is something on par with a battleship gun, but with the kind of accuracy you can get out of the thing, 1 shot should do it. I think the idea behind using it as AA is that the projectile would split up and release a bunch of pellets as it nears the target. One hit from a marble sized chunk of metal traveling at mach 8 would probably be pretty lethal. It also lessens the problem of collateral damage significantly.

    Quote Originally Posted by Frug View Post
    They are looking into those free electron laser thingies (see http://www.theregister.co.uk/2009/04...n_dreadnought/ or the wiki article on the zumwalt http://en.wikipedia.org/wiki/Zumwalt_class_destroyer ) for this purpose and I assume they're much better suited for taking out a cruise missile than a giant railgun.
    FEL would be good vs cruise missiles due to the thin skin around the fuel tank, planes maybe not so much. Last I heard, the biggest problem with FEL on a ship is that the accellerator needs to be aligned perfectly and also wrap around the ship several times. All ships flex along the hull, causing it to bend out of alignment, so there would be some pretty substantial engineering involved in mounting it such that it could deal with the flex.

    Quote Originally Posted by elmicker View Post
    The heat from the friction between the projectile and the air around it has so far had an unfortunate tendency to melt critical components within the railgun every time it's fired.
    There is heat, but it's not really the air friction as much as the massive amounts of current which tend to want to arc weld the projectile to the rails.


    And to keep this post counting as on topic, here's a picture of the USS Cleveland, which my boy scout troop got to spend the night on:
    We stayed in the marine quarters, which were retardedly small. I have no idea how a full sized marine would actually fit into one of the bunks.

  15. #215
    Frug's Avatar
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    Everyone is having good discussions in this thread.

    Have a tiny boat with giant missiles


    Komar class missile boat

    Quote Originally Posted by Loire
    I'm too stupid to say anything that deserves being in your magnificent signature.

  16. #216
    Keorythe's Avatar
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    Small boat with big torpedoes. 40mm Bofors on back, twin .50's in the mids, and 20mm in the front. Not sure if the boxes are for 5in rockets or barbeque pits.


  17. #217
    Phrixus Zephyr's Avatar
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    Quote Originally Posted by Bartholomeus Crane View Post
    Apples and banana's

  18. #218
    walrus's Avatar
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    patrol boats!

    Rap

    Rapp

    Tjeld

    Storm

    Snøgg & Stridsbåt 90

    Hauk

    Skjold

  19. #219
    Qwert's Avatar
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    Independence


    Freedom


    Both lead ships of the Littoral Combat Ship (LCS) class. The Navy liked them both so much that it just split the contract.

    My dad may or may not get work helping with the training program for the Freedom, which is going to be a full VR ship sim in the UT3 engine. The class itself is modular so the ship matters less than whatever mission package is in. This means the Navy can do floating crews, where you just have a crew trained in special ops, but don't need to keep a ship only useful for specops - you just refit it for ASW and put the ASW crew on it.

  20. #220
    Moderator Moderator Evelgrivion's Avatar
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    Quote Originally Posted by Qwert View Post
    IndependenceBoth lead ships of the Littoral Combat Ship (LCS) class. The Navy liked them both so much that it just split the contract.

    My dad may or may not get work helping with the training program for the Freedom, which is going to be a full VR ship sim in the UT3 engine. The class itself is modular so the ship matters less than whatever mission package is in. This means the Navy can do floating crews, where you just have a crew trained in special ops, but don't need to keep a ship only useful for specops - you just refit it for ASW and put the ASW crew on it.
    According to the Perez Report, the quick swap concept doesn't work nearly as well as initially hoped; it would take several weeks to reconfigure an LCS for a given role, rather than the 24 hour period originally intended by the program. Due to various issues and shortcomings, it has been recommended that the LCS program be stopped at 24 ships, rather than the 55 originally planned.

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