"Before cold fusion, build steam engine and boil water. After cold fusion, build steam engine and boil water."
Nuclear powerplants still use steam turbines and I don't know how much preheating the system needs from "shut down at dock" to "33 knot slaloms"

Thermoelectric Generators. Hot loop on one side, cold loop on the other. Differential between hot and cold generates electricity.

For a ship, you can have the ocean provide cooling for the cold loop.

Most dedicated thermoelectric generators AFAIK use nuclear power sources to provide the heat for the hot loop.
Usually radioisotopes, since that requires the least amount of engineering (because if you're putting in something that requires actual engineering you, you could probably put in an actual nuclear powerplant and get even more electrical power out of it).
(OTOH, apparently thermoelectrics are also used to turn waste heat into supplemental electrical power in various set ups.)

Honestly, a TEG of some kind, probably fed by fusion, seems like a possible fit. The scaling problems mentioned earlier in the thread aren't something intrinsic to TEGs as a technology, just current engineering and the (assumed) use-case of long-duration space missions. A TEG installed on a wet-water bote can have the same convection cooling on an isolated external loop. SubNukes already do that.

There's also solid-state direct heat-to-electricity TEGs that are being developed that convert heat to zappies with no moving parts.

I mean, the powerplant question is really a matter of "what tech-base are B-MINTs built on?" There's all kinds of instant-startup powerplant designs that range from 40s tech to centuries away from now. I mean, for all we know Grace is running on muon-catalyzed cold fusion, or she's just got a really beefy diesel-electric. All we know is the start/warm-up time is negligible and she had enough horsepower to chuck a warship like a hacky sack, so who the fuck knows.
 
The most Kerbal way of doing it would obviously involve solid rocket boosters, but I don't think her Ray has enough struts.

Edit (Apropos of this... space shipgirl fairies are obviously Kerbals.)
 
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(Though I likely have the causality backwards, per se, and actually it's only those who want Such And Such will qualify to become of a class which has Such And Such. Pretty much equivalent for purposes of what I was talking about, though.)
Yes.
But, most of the class criteria are more personality-based, not based on body. Want to be an Iowa? You need to be able to fill up the room. So it's that you get assigned a class based on what you already are as a person.
From the responses it seems things in practice may be a bit more complicated and more 'one size fits all' with the mention of 'design by committee' though, which works too.
"Design by committee" was more talking about stuff like what questions are in the aptitude test ("How do you feel about having fluffy hair?" "I like my current hair, thank you very much." "Then you cannot be an escort carrier." "???" (And yes, the line in Chapter 7 about that is already written.)) as opposed to details of new bodies.

Annnnnnd just had a brainwave about this. Brooklyns and other classes with strong "quirks" that fit together are responsible for random quirks that affect the assignment to other classes. If you train a neural network or develop a "systems of equations" so that all your "hit and quit" girls are in the same class, then assign traits you want to other classes without fully defining everything else, you get unusual cases in the regions you didn't define at the design stage. (Also, I have no idea why that'd need to be restricted to a single class but *shrug*)
Question not propulsion of B-MINTs. It will cause you to pull even more hair off your head than the rest of B-MINTs
People making all these crazy speculation on power systems, while I went with a simple, reliable and scalable solution already used in many applications.
Meanwhile the actual propulsion systems... I have no idea how ******* Fleet propulsion actually works, even if I know how to operate it.
 
Fuel cells or some sort of chemo-electric system that bears a resemblance to how cells generate energy.
 
Meanwhile the actual propulsion systems... I have no idea how ******* Fleet propulsion actually works, even if I know how to operate it.
Well, Grace is basically something between a hydrofoil and an ekranoplan, yes?

And the skywings are jets?

She's jet propelled.
(Maybe a mix of waterjets and actual turbofans?)
 
Fuel cells or some sort of chemo-electric system that bears a resemblance to how cells generate energy.
Cells generate energy ultimately via a glucose-oxygen reaction (yeah, there's the anaerobic lactose bit, but...). I'm pretty sure there's no chemistry that would directly 'throw' ship-mass equivalents around based on apparent shipgirl metabolic needs. So, there must be a 'shadow' magical metabolism that draws on some other energy source, and dumps waste heat in some magical sink, or, flat-out ignores thermodynamics (or, something weirder).

This suggest shipgirl's metabolisms are symbolic, so, they're whatever suits the symbolism. So, for all we know B-MINTs are 'burning' something weird like ammonia???

Of course, it's quite possible I'm completely misunderstanding things here...

Well, Grace is basically something between a hydrofoil and an ekranoplan, yes?
I back her being an ekranoplan. :)
 
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And the skywings are jets?

She's jet propelled.
(Maybe a mix of waterjets and actual turbofans?)
They skywings are not jets in the sense of having turbofans or turbojet engines.
The actual propulsive device present here is the tail. Hence Grace having four of them.
There is the advantage of native thrust vectoring, though. Pretty sure Grace can have her skywings pull off some extreme maneuvers.
 
They skywings are not jets in the sense of having turbofans or turbojet engines.
There is the advantage of native thrust vectoring, though. Pretty sure Grace can have her skywings pull off some extreme maneuvers.

No props, but also no jets... Hmmm.

Can't be ornithopters, as they don't have the proper wing area/shape for it, plus "thrust vectoring" wouldn't apply.

Could be but probably isn't gravity drives, as they don't have VTOL. And again, "thrust vectoring."

Rockets? That still leaves a wide time window in terms of techbase. WW2 rocket interceptors or X-Planes don't seem practical for CAP duties, and would be worthless as naval strike aircraft. Nuclear rockets maybe? Using biotech NTRs or Fusion Torch drives in-atmo sounds sufficiently batshit insane for a B-MINT.

...Waitaminute.

You specified turbofans/turbojets specifically. So they could be early jet engines from the 40s and 50s, but giving thrust vectoring to engines with less TWR than a radial prop sounds like a bad idea.

They could also be nuclear thermal jets, which again sounds sufficiently batshit.

The actual propulsive device present here is the tail. Hence Grace having four of them.

I suppose that would technically make her a paddleboat :p
 
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:thinks: But they didn't make an underwater repair ship...
Might be interesting to consider how one might operate?

"We're sinking! Send help!"

"Arrrgggghh! We're being pulled underwater! What is this life?"

"... We're not dead. That's the surface up there. Why are all those engineers standing around grinning at us???"

They could be Motor Jets, less good than a proper jet engine, but they'd be an option. Another would be some weird Pulse Jet contraption.
Maybe Grace at least, and maybe her manta, are using some sort of air lubrication trick? Then steering by manipulating this to give differential drag? Obviously they'd need something to get the air moving, but if those tails produce some sort of field effect around them...

Would that be weird enough?
 
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Y'all speculating on how Grace's planes fly, meanwhile the stock Abyssal aircraft looks like something from a deranged sci-fi movie, while the "elite" planes deployed by high-end Abyssals look like a demonic version of Pac-Man. Have fun figuring those out.
I mean:

en.m.wikipedia.org

Vought V-173 - Wikipedia

en.m.wikipedia.org

Heinkel Lerche - Wikipedia

en.m.wikipedia.org

Focke Rochen - Wikipedia

en.m.wikipedia.org

Stipa-Caproni - Wikipedia


Some aircraft concepts of that era got Weird.
 
Y'all speculating on how Grace's planes fly, meanwhile the stock Abyssal aircraft looks like something from a deranged sci-fi movie, while the "elite" planes deployed by high-end Abyssals look like a demonic version of Pac-Man. Have fun figuring those out.
Maybe they use literal 'nightmare fuel'? :)

Not being a computer-game player I was looking-over with interest the Kantai Collection Wikipedia page...

And, for some reason, was wondering what a Supercar (1960 tv series) shipgirl might be like - unarmed, of course... Possibly wearing the Mercury winged sandals? Quite good for scouting or rescue work?

Some might object to considering this media, but it is Gerry Anderson...
 
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