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So, I was watching a funny movie about undead pirates when the realization hit me, I never once tried to create naval superiority for my Mary Sue. Well, guess I just do it now.

Titanic 2: (n)Ice to meet you is the unholy offspring of Project Habakukk, CMF and Patrick Star.

Titanic 2 is a 1.2 kilometer long aircraft carrier, designed exclusively for UAVs. roughly 4/5 of the ship's body (not counting the conning towers) is a homogenous block of Ultra-high-molecular-weight polyethylene, "alloyed" with an aluminum-based composite metal foam, both reinforced with a hint of graphene.

BIG Something like this. Increase length to 1.2 kilometers, width to 180 meters and double the height.

Can you sunk a plastic bag with a torpedo, or set it on fire? I dont think so!
- Anon, moments before he was set on fire.

The ship's material is buoyant, and unlike pykerete, is much lighter while providing the same, if not better, protection. Basically, Titanic 2 is too large and too simple to be sunken. Weaponized stupidity!

However, I couldn't solve propulsion. Titanic 2 is much lighter than her predescessors, as she isn't an artificial iceberg, but still very massive and I just couldn't come up with a powerful-enough propulsion system, equally as redundant as the rest of the ship.

What propulsion system (with what modifications) should Titanic 2: (n)Ice to meet you use?

Update: Since people kept nagging me about how aluminum is not suitable for this job, then FINE! I declare every instance of the word "aluminum" here to be changed to Y-alloy, a high-strength alloy that maintains its strength, even when subjected to high temperatures for longer periods of time.

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    $\begingroup$ How quickly does it need to move? Do we need to assume that the hullform is just a square brick, or to what extent is sophisticated hydrodynamic shaping allowed? I'm not sure why nuclear powered steam turbines wouldn't get the job done here, you'd just need more of them. $\endgroup$ – Morris The Cat Oct 21 at 18:16
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    $\begingroup$ FYI, you do not need to sink it. A nuke detonated above or near your carrier will knock it out just the same, by destroying the flight deck or flipping it over. If you make your carrier to wide to flip, the waves will flex it until it breaks. $\endgroup$ – Bald Bear Oct 21 at 18:21
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    $\begingroup$ @BaldBear "You don't have to destroy it, you just have to snuggle a nuke past its defenses". Like, what wouldn't be knocked out by that? $\endgroup$ – Mephistopheles Oct 21 at 18:26
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    $\begingroup$ @BaldBear depends somewhat on how H the MW is in the UHMWPE, but hoping to break up something that's notoriously tough and flexible might not be a great tactic. Nuking seems like a bit of a last resort, too, given the sort of international diplomatic brouhaha that's likely to result. Depends on what the owner is doing, of course... $\endgroup$ – Starfish Prime Oct 21 at 18:27
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    $\begingroup$ @StarfishPrime I was originally going to throw a line somwhere in the text that the ship's purpose is to assert dominance over Davy Jones. $\endgroup$ – Mephistopheles Oct 21 at 18:30
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Titanic 2 should use multiple reactors and independent systems to provide a reliable means of propullsion.

However your Titanic 2 would be very vulnerable to missile attack. I shudder to think what would happen to such a homogenous block of Ultra-high-molecular-weight polyethylene, "alloyed" with aluminium-based composite metal foam, both reinforced with a hint of graphene, were it to encounter a high velocity surface to surface missile. It would make the Hindenburg look like a fire lighter.

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  • $\begingroup$ The hot exhaust of planes landing alone would be cause for concern... $\endgroup$ – Nosajimiki Oct 21 at 18:36
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    $\begingroup$ news.ncsu.edu/2016/03/rabiei-heat-2016 Turns out, the opposite is true. $\endgroup$ – Mephistopheles Oct 21 at 18:39
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    $\begingroup$ UHMWPE is substantially less flammable than an airship that was a hydrogen balloon wrapped in aluminised fabric. Also note the presence of aforementioned nuclear reactors and the entire ocean... it can't really sink if you build it correctly, so it can just douse itself. It'd be a long battle of attrition to finish it off. $\endgroup$ – Starfish Prime Oct 21 at 18:43
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    $\begingroup$ To be fair, you deserve a +1 for the unclear reactor, as CMF excels at radiation shielding. $\endgroup$ – Mephistopheles Oct 21 at 18:46
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    $\begingroup$ This is the right answer. Lots of those SMB molten salt reactors everybody is excited about these days. Modular, independent. Get a couple dozen of those distributed throughout the ship all hooked up to steam turbines and a power grid that's supplying an equally redundant network of electric motors underneath the ship. Problem solve. $\endgroup$ – Morris The Cat Oct 21 at 18:59
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Many vessels in history have had two or more methods of propulsion.

Galleys have both sails and oars.

Most 19th century steamships had both steam engines and masts and sails. most large modern sailboats have both sails and motors.

The Great Eastern (1858-1889) had two side paddle wheels and four steam engines for the paddle wheels and another steam engine for the propeller. It also had six masts and a large amount of sails.

Many later vessels have multiple steam engines and multiple propellers. Many modern ships have multiple propellers in pods attached to the, ship and the pods can be turned in various directions for flexibility in maneuvering.

Many large aircraft carriers of today have one or more fission reactors to power their engines, even though they are smaller than your super carrier.

Therefore, I deduce that your super carrier would have hollow areas inside its unsinkable block structure, containing enough fission reactors - or possibly fusion reactors if far enough in the future - to power the ship.

For propulsion the atomic reactors would generate electricity and the electricity would be transmitted by wires to many propellers in many pods attached to the main hull of the super carrier.

For reasons of stability the massive nuclear generators in their hollow areas should be placed rather low in the ship. So they might be partially below the waterline, and thus could possibly flood with water.

To counteract that the super carrier should contain water storage tanks containing an equal mass of water as would fill the hollow areas containing the atomic reactors. If the atomic reactor areas start to flood, water can be pumped from the storage tanks into the sea to maintain the weight of the super carrier at a constant level, while pumps also pump water out of the reactor areas.

You may remember Tom Clancy's 1984 novel The Hunt for Red October and the 1990 movie based on in. The Soviet submarine Red October is supposedly equipped with a stealthy magnetohydrodynamic (MHD) dive to use only magnets, with no moving parts, to travel though the water.

MHD has been studied for propulsion of surface ships, submarines, aircraft, etc.

Marine propulsion

MHD has no moving parts, which means that a good design might be silent, reliable, and efficient. Additionally, the MHD design eliminates many of the wear and friction pieces of the drivetrain with a directly driven propeller by an engine. Problems with current technologies include expense and slow speed compared to a propeller driven by an engine.[14][15] The extra expense is from the large generator that must be driven by an engine. Such a large generator is not required when an engine directly drives a propeller.

The first prototype, a 3-meter (10-feet) long submarine called EMS-1, was designed and tested in 1966 by Stewart Way, a professor of mechanical engineering at the University of California, Santa Barbara. Way, on leave from his job at Westinghouse Electric, assigned his senior year undergraduate students to build the operational unit. This MHD submarine operated on batteries delivering power to electrodes and electromagnets, which produced a magnetic field of 0.015 tesla. The cruise speed was about 0.4 meter per second (15 inches per second) during the test in the bay of Santa Barbara, California, in accordance with theoretical predictions.[20][21][11][12]

Later, a Japanese prototype, the 3.6-meter long "ST-500", achieved speeds of up to 0.6 m/s in 1979.[22]

In 1991, the world's first full-size prototype Yamato 1 was completed in Japan after 6 years of R&D by the Ship & Ocean Foundation (later known as the Ocean Policy Research Foundation). The ship successfully carried a crew of ten plus passengers at speeds of up to 15 km/h (8.1 kn) in Kobe Harbour in June 1992.[2][23]

Small-scale ship models were later built and studied extensively in the laboratory, leading to successful comparisons between the measurements and the theoretical prediction of ship terminal speeds.[14][15]

Military research about underwater MHD propulsion included high-speed torpedoes, remotely operated underwater vehicles (ROV), autonomous underwater vehicles (AUV), up to larger ones such as submarines.[24]

https://en.wikipedia.org/wiki/Magnetohydrodynamic_drive#Marine_propulsion1

So depending on how advanced the society of your story is, the super carrier might use a MHD drive full time or part time.

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    $\begingroup$ SO, there is someone who built an underwater ionocraft!? $\endgroup$ – Mephistopheles Oct 21 at 19:09
  • $\begingroup$ Galleys have oars. A vessel with both oars and sails is a galleass. $\endgroup$ – Sean Oct 22 at 7:03
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    $\begingroup$ @Sean. Galleys have masts and sails. Ancient Mediterranean war galleys left their masts and sails behind when they went into battle, but would normally us e their sails for travelling long distances. The difference between early modern galley and galleasses is more the size and weight of galleasses, since they both used both sails and oars.. $\endgroup$ – M. A. Golding Oct 25 at 17:07
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Tugs

This isn’t a vessel. This is a platform. Much like an oil rig you should move it to wherever it is you think needs that much UAV support, then anchor it (Anchoring is a stupid idea, keeping this ship moving is pretty essential, thanks to @ MorrisTheCat for pointing that out!) To that end you don’t want it to move under it’s own power: that would be exorbitantly expensive and hard to do, not to mention maintenance would be a pain.

So instead have a fleet of tugs. Preferably drone tugs, in keeping with your remote operation theme. Give them light armour, no weapons, heavy structural bracing and keels and huge, huuuuge engines, and then chain them to your carrier-berg.

They offer several advantages: individual tugs can be swapped out with ease. With a vessel that size you could even have a small dry dock for tug repair if you wanted. The loss of any one tug won’t completely cripple you (though you may need to take care with load balancing: more on that in a bit). Tugging and shunting offer you all manner of directional control for difficult maneouvres, and in the event of attack your small, powerful tugs can be tactically repurposed to help potentially damaged or incapacitated escort vessels.

The downsides are logistical complexity, additional vessels that need defending from both the enemy and the sea, and structural stresses due to unbalanced loads. All of these are helped by using drone tugs!!

Drone tugs can automatically monitor and adjust for various stresses on the coupling chains, automatically working as a group to perform even the most complex tugging operations. Drone tugs also don’t run into the logistical complexities created by squishy meat bags. All they need is fuel and repair.

Defence is a touch more tricky. International law on maritime drones gets tricky when you start bolting on weapons, but as these are tugs you wouldn’t expect them to have much of their own. Instead these will be heavily reliant on the shelter of their fellow support vessels. That’s easy in the case of enemy attack: as long as they’re sufficiently covered by point defence, AA envelopes and electronic warfare and anti-torpedo defences... phew ... they should be fine. Your escort vessels can take care of all that, right?

In the case of defence from the sea: tugs aren’t typically built for storms. Open sea isn’t what they do (Except for specialist platform tugs, and even they avoid storms that your carrier group might have to weather) They will capsize, flood and sink. But your tugs are drones! They don’t care about staying upright for the most part. Build them watertight, with a heavy keel, and they can flip all the way over without really inconveniencing anyone. You do need to make sure they don’t bash into other vessels though, and for that you need relatively calm waters. For example: the calm waters that can be found in the lee of a 1.2 KM long behemoth of an aircraft carrier. Cluster your tugs together on the leeward side of the ship, then use their drone-co-ordination to keep the carrier facing the correct way into the wind and waves. You won’t move fast, but should come out of the storm all shipshape and Bristol fashion.

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  • $\begingroup$ I don't like this approach for a military asset. This isn't big and indestructible enough to be completely immobile during combat operations. Even something that only moves slowly can ensure you need real-time targeting data to hit it with ballistic fire. Anchored and dependent on tugs, you wouldn't need nukes, you could use ICBMs with kinetic impactors. Tungsten rods at orbital velocities would be plenty sufficient for a mission kill, even if it's still technically floating. $\endgroup$ – Morris The Cat Oct 21 at 19:37
  • $\begingroup$ @MorrisTheCat: If you dislike staying still you can happily keep using the tugs during combat instead of orbiting, but at 1.2 km long and nearly 200 m wide I stand a reasonable chance of scoring a mission kill just by aiming at the front of the ship. Even if this beast is moving as fast as a Nimitz at cruising speed (it won’t be) I think there’s still enough time for a projectile to impact from orbit before the ship has cleared its own length. $\endgroup$ – Joe Bloggs Oct 21 at 19:57
  • $\begingroup$ Not sure about your math there... even at ~25kph it'd be clearing its own length in less than three minutes. A ground launched ICBM takes thirty to reach impact. I'm can't find a good estimate for dropping something from orbit, but I doubt it's going to be much less than ten minutes. $\endgroup$ – Morris The Cat Oct 21 at 20:06
  • $\begingroup$ @MorrisTheCat: Just run some numbers. I underestimated the drop time on an ICBM. Good news is that a ship this size moving at 30 knots can clear its own length fast enough to avoid anything hitting it at orbital speeds. Other good news is that the same is true even if the tugs are semi-capable of operation. I’m updating my answer. $\endgroup$ – Joe Bloggs Oct 21 at 20:07
  • $\begingroup$ @MorrisTheCat: Hah. I was checking my own numbers as you were typing. ~30 minutes is for hitting targets halfway round the world. You could still have a ‘hypervelocity’ impact within 15 minutes if you wanted and the ship was a bit closer (which gives even tugs enough time to move the ships) $\endgroup$ – Joe Bloggs Oct 21 at 20:11
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Sails

Your vessel is stupidly light. It is also very large. So it can have thousands upon thousands of sails of all kinds and shapes. They would be very redundant and replaceable.

It could also pick up a hell of a speed depending on how it's built, once it builds enough momentum and if the ocean current helps.

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    $\begingroup$ An aircraft carrier that has to lower sails and stand still for allowing take off or landing of its aircraft is a butter cookie for any artillery man $\endgroup$ – L.Dutch - Reinstate Monica Oct 21 at 19:37
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    $\begingroup$ We had a white-out on a highway near our airport due to blowing snow, and someone wrote into the paper with a letter to the editor suggesting a line of trees at the end of the runway. $\endgroup$ – ceejayoz Oct 22 at 16:04
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    $\begingroup$ @ceejayoz A net would have been enough. $\endgroup$ – Mephistopheles Oct 22 at 17:19
  • $\begingroup$ Not only lowering sails, but stowing them so they don't catch fire or torn from the jet exhaust. You also have to consider damage for a crash landing. Sure, the SOP for clearing the deck is to bulldoze the wreck into the ocean, but if your rigging or even hatches for the sails are damaged and can't be deployed, that could easily become a disaster. Not to mention if the wind itself doesn't cooperate. $\endgroup$ – computercarguy Oct 22 at 18:35
  • $\begingroup$ @computercarguy OP is going for weaonized stupidity [SIC]. So... $\endgroup$ – Renan Oct 22 at 19:26
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Aircraft

Your carrier is stupidly light. It also has space for a large amount of aircraft, all with very powerful turbines...

When aircraft are stored in a real carrier, they are locked to it with things such as holdback bars:

Holdback bar

Just bind enough jet fighters on the main deck through such bars, all pointing the same way, then turn the engines on. And as your ship conquers the waves, apply appropriate soundtrack.

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    $\begingroup$ That is a good use of all those layabout jet planes, getting a free ride, doing nothing. The ship will not be able to go anywhere when the planes are up in the air but that is ok - you don't want it scurrying off somewhere or the planes wont be able to find it later when they get tired. $\endgroup$ – Willk Oct 22 at 16:41
  • $\begingroup$ That's horrendously expensive. Not only in fuel costs, but also repair costs. And not just in engine costs, but also bracing and other structural repairs in the carrier and the airplanes. $\endgroup$ – computercarguy Oct 22 at 18:37
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    $\begingroup$ @computercarguy OP is going for weaponized stupidity [SIC]. This is meant to be stupid. $\endgroup$ – Renan Oct 22 at 19:25
  • $\begingroup$ That comment does it, flagging as spam... $\endgroup$ – Mephistopheles Oct 22 at 21:06
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Dolphins (or Whales)

Train a few pods of dolphins to wear special dolphin harnesses which allow them to collectively pull your fighting barge where it needs to go. Of course, you power the dolphins with feed fish buried deep in its hold. Also, the barge has fishing gear so you can replenish your fuel at sea.

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Your drones should be electrically powered. The aircraft carrier is nuclear powered, with oodles of small reactors dispersed throughout the ship. Since you already have a ton of drones and a ton of power, efficiency isn't a concern -- stick some of those bad boys under water and have them push the ship (your drone propeller design may have to be somewhat complicated to handle two different fluids).

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Frame Challenge:

You cannot keep that ship right side up.

IN order to be stable, the center of mass of a ship has to be below the water line. This is generally accomplished rather easily, having a hollow ship means that most of the weight is in the hull, and therefore the right way down. Some ships use weights to ensure stability.

However, your hull is a solid block of mass lighter than water. It'd start capsizing right out of the shipyard.

There's a reason ships aren't build this way. Even the wooden canoe's in the amazon forest are hollowed out to stay right side up.

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    $\begingroup$ Frame challange: the nuclear reactors that keep this funk moving are the center of mass and are below the waterline. $\endgroup$ – Mephistopheles Oct 22 at 8:29
  • $\begingroup$ That's a way to solve it, but those aren't mentioned in the question. $\endgroup$ – Gloweye Oct 22 at 8:30
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    $\begingroup$ Actually... the CM (center of mass) does not need to be below the waterline, or even below the center of buoyancy. The shape of the hull determines how the center of buoyancy will move as the ship rolls. This is why you can put a heavy load on top of a wide barge (CM very high indeed) but not a narrow one. Wikipedia "Metacentric Height" and specifically, "Righting Arm". en.wikipedia.org/wiki/Metacentric_height $\endgroup$ – user9394 Oct 22 at 9:03
  • $\begingroup$ From what I could see in the question, the ship wasn't that wide compared to it's length. $\endgroup$ – Gloweye Oct 22 at 10:06

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