How big are your ships, /tg/?

>>51534238
Depends.

Colony ship for a hard sci-fi was a cylinder of around 3+ kilometres in length.

Military ships for space opera from ~10(fighters) to around 300 (dreadnoughts) meters.

FTL ships are dyson rings because it's the only way to accumulate enough energy to power an alcubierre drive.

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>>51534238
Super-massive warships in my ideal setting are a kilometer long. Considering the largest ship ever was about half that it's pretty massive. You can go super-luminal with ships just over 100 meters.

I personally really dislike the sci-fi theme of making absolutely hugeass ships the norm. Not only are you declaring a bunch of space you are never going to use but no one will actually imagine it. Anything larger then 1 km is just 'very large'.

>>51534238
Most factions have huge kilometer-sized space battleships that fire lasers and coilguns at broadsides. Protagonist faction on the other hand have space submarines packed full of stealth technology, masers to fry up enemy targeting systems and FTL-missiles with nuclear warheads.

>>51534999

It is not wrong to have large ships. Bigget ships, van store more propellant and fuel which means they can accelerate for longer periods of time. The issue is that ships should be 99% fuel and reactos with only small habitable section.

>>51534999
The lack of gravity means ships can be as large as you want. Not taking advantage of that seems foolish. It's not even really a problem of stealth below like 100 km because space is so massive.

>>51535161
Physics does not scale that way, anon.
If you scale a ship in two, it's engines get 2^2=4 times more powerful, but the ship itself becomes 2^3=8 times heavier.

>>51535203
>Engines are two dimensional things
Nigger they get cubed just the same as the rest of the ship.

>1x1x1km ship, 1 km cubed volume
>.5x.5x.5km are within that (somwhere) is its engines, .125km cube volume, .875km cube non-engine volume; 12.5% engine, 87.5% non-engine.
>double everything
>2x2x2km ship, 8 km cube volume
>1x1x1km engine, 1km cube volume, 7km cube non-engine volume. 12.5% engine, 87.5% non-engine

>>51535303
>Engines are two dimensional things
Nozzles are

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>>51535333
>using conventional rockets for your multi-kilometer long interstellar vehicle

>>51535303
>Nigger they get cubed just the same as the rest of the ship.
Not without completely redesigning reaction chamber for higher pressures and temperatures. Otherwise you'd have the same propellant speed, and squared nozzle projection.

>>51534238
Anything more than a kilometer long for a warship, and you're compensating for something.

Bulk freighters might be longer, but not by much.

>>51535363
Because surely we should invent a propulsion system that scales perfectly cubically in the future despite the fact it's literally impossible from what we currently know about physics.

>>51535539
>worrying about realism
>with interstellar space ships and stuff going over 1km in length

>>51535203

A smaller ship offers no advantage over a bigger one besides economics.

>>51535539

You realise that ships get lighter as their tanks become empty, right?

>>51535815
You realize it scales quadratically too, in line with engine intake limitations with a given pressure.

>>51534238
The biggest airships are the Bane class.

>>51536131
Do they break Batman class airships?

>>51534238
thirty billion trillion miles long

>>51536206
Do they believe in you that believe in them?

Length is a really bad way to measure craft, mass is better. Length falls apart unless every single spaceship in your setting are just tubes of the exact same width.

>>51536155
Without survivors.

>>51536155
kek

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>>51536131
Bane??

>>51536363
>not using dTons

Someone should've failed their survival roll

>>51536131

Then what about the CIA class ships?

>>51536440
They have specially designed airlocks that, when told to, shoot whoever's in them before venting into space

There are two things in space that are relevant when talking about "speed": delta-v and acceleration.

Delta-v is determined by the specific impulse (fuel efficiency) of the ship's engines and the percentage of the ship's mass that is fuel. Tonnage of the ship doesn't really matter here: it is a ratio thing. If the specific impulse is the same and the fuel percentage to total mass the same, any size ship will eventually reach the same final speed. Thus, here, if fuel costs are ignored, small ships have no advantage over large ships. (And indeed, if you are going on a long trip, the large ship offers other advantages in how many supplies or for war, how many weapons it can carry at no cost to delta-v, again, if the ratio remains constant) So the question is how fast can they reach it, which brings me to acceleration.

>>51536563

Acceleration is determined by total engine thrust and the total mass of the ship. At first glance, it seems that the smaller ship would obviously have the advantage here, but there are other factors that need be observed.

One is the structural strength of the materials of which the ship is constructed. This becomes a big problem on insanely huge ships with larger accelerations, since the 'weight' the spaceframe must support goes up faster (it cubes) than the amount of weight it can handle (it squares). However, steel is strong enough that with realistic sizes and accelerations, this should not be an issue before one of the other ones are.

One that is a much bigger problem is how much the human crew can handle. Well trained people in g-suits can handle 9 g's for a short time, but much more than this is a bad thing to just about everyone - their aorta can't handle it. In fact 5 positive g's are enough to cause most people to pass out, as she explains. If the crew is passing out, the ship is in trouble. This problem can be lessened by the use of acceleration couches: someone laying down flat can handle it much better for longer, but even 5 g's laying down is going to be very uncomfortable, and the crew will have a hard time moving their arms. Extended trips would probably be best done at 1 g so the rocket's acceleration simulates Earth normal gravity, with peak acceleration being no more than 3-5 g's for humans in the afore mentioned couches if possible.

That is probably the most significant limit on acceleration, since it is an upper limit of humans.

>>51536463

But why would you shoot a man before venting him out of an airlock?

>>51536363

Let's see. A reasonable acceleration of three gees is about 30 metres per second squared acceleration. F = ma, so let's see what mass is possible. 4e8 / 3e1 = 1e7 kg, or about 10000 metric tonnes for a battleship.

>>51536658
Indeed, You need to also slice his throat and inject a neurotoxine into his bloodstream to be extra sure.

>>51534238
>...during the course of our two-hour right turn
I fucking lost it right there.

So, uh, in the defense of the non-canonical "ultra" star destroyer, pictured above, it was meant to be an intergalactic ship. This whole fucking thing was meant to be a galaxy-wide invasion entirely on its own. It comes with its own fleet of capital ships (themselves equipped with TIE fighters and ground troops) and a planet-busting superlaser on the front of it. It's crewed by clones and equipped with cloning tech onboard, along with Star Wars' equivilent of 'Trek replicators to make whatever stuff is necessary. The whole ridiculous thing was schemed up by the Emperor who (in what is now non-canon sources) intended to live forever, and had an ego big enough to want to conqueror the universe.

All that being said the ship is way less massive than either death star; it's about 300km long compared to the first Death Star's 160km diameter, but the first Death Star was a sphere. And then the Death Star II was even bigger. This is more mobile, somehow, despite the Death Stars having hyperdrives.

>>51536726
If you did that, would they die?

>>51536363
Lengths are a lot easier to visualise, and it means you don't have to add mass numbers for your space materials.

It also means you're not accidentally making your ships less dense than cardboard or much much smaller than you intended - current large vessels exceed 500 Megatons, and the largest lifting vessels in the world are approaching a max displacement of a Gigaton (when it's taken on a shit-ton of ballast, presumably water)

>>51536756
99.9% sure. So assume not.

>>51536756

It would be extremely painful.

>>51536702

400 mega-newtons of thrust. Fission nuke pulse propulsion.

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>>51536775

>>51536775
For you

>>51534238
I don't get this joke, the death star is bigger

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I'm a small ship guy, in general warships FTL don't exceed the 150.000dt(not traveller ones, normal one), but some hugh-ass defense systems can be 1mdt or even more,using hugh planetoids as a base.

>>51537111
It's not a joke, it's a series spaceship somebody came up with.

>>51537180
What I mean is that I don't get the joke of "so incredible big", "people formed cities and tribes", etc. Death Star is bigger and that didn't happen.

>>51537313
the joke is that on a spaceship this big, it would happen (and that the fact the death star was written without that in mind is silly)

>Naming a ship in another galaxy from a long time ago after a person from our real world

Shit like that annoys me. There should be no references to our world in Star Wars. Stuff like Malak's ship being called the Leviathan I can accept, but not when they're named after real life humans.

>>51534238
The basic guideline I tend to follow is tens of meters for small ships (military escorts and most privately owned shkps), hundreds for capital ships (cruisers et al) and big industrial ships (large freighters, mining barges, etc.), and around 1 km for the biggest of the big (huge battleships and carriers, space equivalent of those huge container ships and supertankers).

>>51534238
A 2 km long mothership that has onboard manufacturing plant, with 800 m battleship and bunch of lesser ship as escorts.

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>>51534238
Forty million feet.

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>>51536363
Just go with lighter than air dildoes.

>>51537386
Echo Base always bugged me since Echo comes from the Greek myth

>>51540790
Nah, it's the name for the esk letter in the ancient language of the humans from before basic.

>1km is long

The USN has 340m vessels , and they have to deal with things like water and gravity.

But yeah, like the OPs pic - I hate the YUUUGE ships in sci fi settings..... The worst offense being the fuck wrong scaling.

"The ships is 3x as long so everything from toilets to windows are now 3x larger...."

Have any of you guys played a game set on of a spaceship?

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I'll go by FTL capability
Most species that have FTL start with ships around 150 meters and top out at around 2000 meters

The ancient Precursor species Humans range from single person pods to their largest seen ship that is 600 by 325 by 100 kilometers, though since they are capable of warping space the interior of their ships vary in size greatly

>>51534238
From a few hundered meters to 10km.

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>>51534238
git on my level fagort

>>51537313
The Death Star isn't a scaled up star destroyer.

>>51542112
Why didn't the Z-fighters just wish for Shenlong to destroy the Saiyans space pods, leaving them to suffocate in the vacuum of the void?

It would have worked since the only reason they couldn't wish for him to kill the Saiyans directly is their power levels were too stronk.

>>51534238
And this paved the way for the designs of all Imperium ships in WH40K.