FredKiesche,
@FredKiesche@dice.camp avatar

And there it is…the first novel-length installment appearance of the BOMB-PUMPED X-RAY LASER!

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cstross,
@cstross@wandering.shop avatar

@FredKiesche Much napoleonic navies in space, very stardrives-but-nobody-invented-turrets, wow!

Shiba Inu Moon GIF by ProBit Global

FredKiesche,
@FredKiesche@dice.camp avatar

Nobody like Weber for a stern chase full of slashing lasers and flying missiles. And nobody like Weber to drop a multi-page info dump about the physics of hyperspace wormhole physics right in the middle of said tense space battle.

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sudnadja,
@sudnadja@vivaldi.net avatar

@FredKiesche what is this referring to?

FredKiesche,
@FredKiesche@dice.camp avatar
FredKiesche,
@FredKiesche@dice.camp avatar

@sudnadja There’s a new installment coming and I have a few other unread books as well, so I am doing a “chronological by timeline” run through the books and shorter works. https://en.wikipedia.org/wiki/Honorverse

sudnadja,
@sudnadja@vivaldi.net avatar

@FredKiesche I really need to get around to reading these at some point

nyrath,
@nyrath@spacey.space avatar

@sudnadja @FredKiesche

The Honor Harrington novels have a special appeal to fans of Horatio Hornblower

sudnadja,
@sudnadja@vivaldi.net avatar

@nyrath @FredKiesche not to out myself as a pseudo-nerd undeserving of the title, but I don’t know what Horatio Hornblower is, either

tarheel,
@tarheel@mstdn.io avatar

@sudnadja @nyrath @FredKiesche

I wouldn't have known, either, if my dad hadn't been a huge Hornblower fan.

nyrath,
@nyrath@spacey.space avatar

@tarheel @sudnadja @FredKiesche

My first clue was in The Making of Star Trek, where Captain Kirk was described as "Horatio Hornblower in Space"

nyrath,
@nyrath@spacey.space avatar

@sudnadja @FredKiesche

https://en.m.wikipedia.org/wiki/Horatio_Hornblower

The career of Honor Harrington in the future is reminiscent of the career of Horatio Hornblower in 1803.

And Honor is the first scifi I've read where combat starships fire broadsides.

sbisson,
@sbisson@mastodon.social avatar

@nyrath @sudnadja @FredKiesche Doesn't it switch to first Jack Aubrey and then Horatio Nelson before Weber decides not kill her off...

FredKiesche,
@FredKiesche@dice.camp avatar

@sbisson @nyrath @sudnadja Aubrey was Weber’s initial inspiration. He has said so.

sudnadja,
@sudnadja@vivaldi.net avatar

@nyrath @FredKiesche One of the things I don't like about much of science fiction set in mid-future timeframes is that it attempts to recreate the age of sail, in space. Space is a different environment than humans have ever dealt with before in warfare - for once, we're not moving though a medium dense enough that motion (and momentum) is dominated by it, yet it isn't all that often that science fiction treats it that way. Nearly everyone has some form of generated gravity because, I think, they still want an attachment to sea going vessels and warfare standards.

RogerBW,
@RogerBW@emacs.ch avatar

@sudnadja @nyrath @FredKiesche Also, cheaper for the TV and film versions, and for some writers that's an influence.

sudnadja,
@sudnadja@vivaldi.net avatar

@RogerBW @nyrath @FredKiesche The Revelation Space approach could be taken, if you're referring to generated gravity, with "gravity" being usually present thanks to constant acceleration, though you'd still have periods of time without gravity. When dealing with written fiction though, there shouldn't be quite the resistance to freefall scenes, unless there is a deliberate attempt to maintain the sense of a seagoing ship, I think

KarlSchroeder,
@KarlSchroeder@mastodon.social avatar

@sudnadja
I had fun in The Fallow Orbits (which just finished its serialization on my newsletter) with mediocre acceleration: too much to float or fly about the cabin, not enough to walk. The crew spend weeks crawling like crabs, rolling, waddling on their knees, doing nothing in a dignified way. Ah, the romance of space travel!
@RogerBW @nyrath @FredKiesche

nyrath, (edited )
@nyrath@spacey.space avatar

@sudnadja @FredKiesche

I'm with you on that. What enrages me is arranging a spacecraft like a passenger airliner, so that the direction of "down" is 90° to the exhaust direction, instead of in the identical direction.

This started with Flash Gordon, and is common today. Ships are arranged like skyscrapers, everybody!

https://www.projectrho.com/public_html/rocket/advdesign.php#down

Tallish_Tom,
@Tallish_Tom@fosstodon.org avatar

@nyrath @sudnadja @FredKiesche

The Expanse ships got this right.

flippac,
@flippac@mendeddrum.org avatar

@nyrath @sudnadja @FredKiesche The Enterprise is a slightly unfair choice: it's not supposed to land, there's an entire ecosystem of tech for avoiding that! Forwards is a bit more problematic (whatever "impulse" is supposed to mean), and the show's always been fairly transparent about that, but forwards isn't up/down in most Trek vessels.

nyrath,
@nyrath@spacey.space avatar

@flippac @sudnadja @FredKiesche

I am singling out Star Trek, but pretty much all TV scifi has the same "mistaking a spacecraft for an airliner" problem.

With a few notable exceptions (The Expanse, For All Mankind, etc)

flippac,
@flippac@mendeddrum.org avatar

@nyrath @sudnadja @FredKiesche Oh, I know. Just, the gravity vs thrust thing is a pretty significant difference that plenty of shows do enough work on - "splat on takeoff" and "splat on non-trivial thrust" are worth telling apart and the diagram only works for the former when I think we'd both like to see some work on the latter?

(I think the implication in Farscape was just that Moya never really accelerated that hard - but FTL is weirder than usual for TV SF in it)

tarheel,
@tarheel@mstdn.io avatar

@nyrath @sudnadja @FredKiesche

My sentiments exactly. Imagine all the gorgeous skyscrapers and they don't even have to be streamlined!

Skyscrapers with gun platforms jutting out.

mattmcirvin,
@mattmcirvin@mathstodon.xyz avatar

@nyrath @sudnadja @FredKiesche Oh, it started way before Flash Gordon. Often with science-fictional spaceships that looked more like ornithopters or submarine-helicopters, by people who were somewhat unclear on the concept.

sudnadja,
@sudnadja@vivaldi.net avatar

@nyrath @FredKiesche That's one thing I liked about , there's no generated gravity and thus ships are designed in the stacked orientation with decks perpendicular to the direction of thrust, which has a slightly more realistic feel (to me).

Robert_Brandt,
@Robert_Brandt@spacey.space avatar

@sudnadja @nyrath @FredKiesche Vertical alignment, I don't have deck plates so I do it too.

maxthefox,
@maxthefox@spacey.space avatar

@nyrath @sudnadja @FredKiesche I try my absolute best to take that into account... and make sure to describe the situation as resembling that of a carousel whenever the ship makes a maneuver involving a quick turn.

isaackuo,
@isaackuo@mastodon.social avatar

@nyrath @sudnadja @FredKiesche

Counterpoint - the only real life "ship" currently up there is the I.S.S., and it's arranged with "down" 90 degrees to the exhaust direction.

https://scitechdaily.com/see-what-happens-on-the-space-station-during-an-orbital-reboost-maneuver/

The main reason for this orientation is that it's practically necessary for the training copy on Earth. Other spacecraft won't necessarily have the same sort of design priorities, but it's worth remembering - a spacecraft is just one part of an overall system.

sudnadja,
@sudnadja@vivaldi.net avatar

@isaackuo @nyrath @FredKiesche the acceleration that the ISS can provide is effectively zero though (a few cm s^-2 or so?) which is not the situation that the mid future sci-fi generally describes. Yes, if the vehicle will never undergo significant acceleration then orientation can be arbitrary, but that’s not the case for vehicles that accelerate at 1 g or so.

isaackuo,
@isaackuo@mastodon.social avatar

@sudnadja @nyrath @FredKiesche

What sort of vehicle should accelerate at 1 g or so, though? You get the benefits of the Oberth effect at much lower accelerations, and designing for lower accelerations provides a lot of benefits. You get reduced structural mass - especially for solar arrays and radiators, lower thruster/engine mass, and usefully better specific impulse.

sudnadja,
@sudnadja@vivaldi.net avatar

@isaackuo @nyrath @FredKiesche Star Frontiers and Traveller vehicles are all at least 1g, the Revelation Space spacecraft are generally at least 1g, I suppose you could say Known Space spacecraft are usually much more than 1G. "Mid-future" science fiction, to me, means hundreds to thousands of years in the future, but not tens of thousands (that is, not so far as dune, but further than The Martian). You get the benefits of the Oberth effect at any acceleration, but it's best if that acceleration is concentrated where the vehicle is moving the quickest - if you could do 100g for 1 second right at periapsis you might prefer that to 1g for 100s for the 50s around periapsis. I'm curious to see if the internal layout of larger vehicles like (spaceX) Starship will use.

isaackuo,
@isaackuo@mastodon.social avatar

@sudnadja @nyrath @FredKiesche

I suppose if you don't care about realistic technology or space navigation, then who cares?

Neither Star Frontiers nor Traveller attempt to use realistic mid future space propulsion technology. They're meant to replicate familiar SF tropes for the purposes of (tabletop) role playing. It's a design decision to include artificial gravity and "horizontal" decks to make things familiar for the players and game master.

Now, you mention The Martian ...

cstross,
@cstross@wandering.shop avatar

@isaackuo @sudnadja @nyrath @FredKiesche If you've got a magic reaction drive (unlimited thrust, no waste heat, no fuel mass problem), then you might as well thrust at whatever acceleration is best for the cargo. If that's humans, it would be the lowest acceleration to keep the adverse medical effects of microgravity at bay (probably a lot less than 1g but more than 0.1g).

isaackuo,
@isaackuo@mastodon.social avatar

@cstross @sudnadja @nyrath @FredKiesche

Depending on your definition of "unlimited thrust", you could squint and say artificial spin gravity qualifies. It obviously has no waste heat or fuel mass problem.

If your spacecraft spins, the most intuitively obvious thrust axis is parallel to the spin axis, but it's not a no-brainer. For example, with solar electric you probably want the spin axis pointed to the Sun, but you usually want thrust perpendicular to the Sun.

RogerBW,
@RogerBW@emacs.ch avatar

@isaackuo @cstross @sudnadja @nyrath @FredKiesche With solar electric that's relatively simple to arrange. Solar sails harder, but in that case the thrust is so low that it will be lost in the noise in the spin habitat.

KarlSchroeder,
@KarlSchroeder@mastodon.social avatar

@isaackuo
Once you stop accelerating, you split the ship in two and let out a line. Then you spin the bolo. Simple! People think of spacecraft like boats, as necessarily unitary. Baw. Split 'em up into however many pieces you need and spin the parts separately if you need to. It's not like the other sections are going anywhere unless they're pushed.
@cstross @sudnadja @nyrath @FredKiesche

hendric,
@hendric@astronomy.city avatar

@KarlSchroeder @isaackuo @cstross @sudnadja @nyrath @FredKiesche Rotating warships a la B5 are just a bad idea (no matter how cool they look). Rotating is enormous momentum and makes it hard to do dynamic motions. And damage to the section would rapidly cascade into a disaster. Expanse's "everyone strap in for high G" is the only sensible way to fight.

KarlSchroeder,
@KarlSchroeder@mastodon.social avatar

@hendric
Realistic space warships aren't single entities except when under power; they're dispersed constellations (swarms) and typically will engage in battle from millions of kilometers away. Incoming ordnance will be stealthed and traveling at tens of kilometers per second. Possible fleet trajectories will be known ahead of time. The concept of 'maneuvering' simply doesn't apply.
@isaackuo @cstross @sudnadja @nyrath @FredKiesche

Hcobb,
@Hcobb@spacey.space avatar

@KarlSchroeder @hendric @isaackuo @cstross @sudnadja @nyrath @FredKiesche Doesn't the assumption of high delta-V low thrust drives for ships and the reverse for missiles lead to the count-down timer battles where two fleets cross in the night at km/s?

StevieP,
@StevieP@mastodon.org.uk avatar

Cant quite remember the quote or where i read it but

The main problem facing a commander wishing to join combat, is that combat is almost impossible to join

Bugger, thats got into my brain untill i find it

@KarlSchroeder @hendric @isaackuo @cstross @sudnadja @nyrath @FredKiesche

nyrath,
@nyrath@spacey.space avatar

@StevieP @KarlSchroeder @hendric @isaackuo @cstross @sudnadja @FredKiesche

Curse you 😉
That quote sound exceedingly familiar. No, I cannot remember where it is from, either.

c0dec0dec0de,
@c0dec0dec0de@hachyderm.io avatar

@KarlSchroeder stealth being another difficult thing in space. Nothing to hide behind. @hendric @isaackuo @cstross @sudnadja @nyrath @FredKiesche

sudnadja,
@sudnadja@vivaldi.net avatar

@c0dec0dec0de @KarlSchroeder @hendric @isaackuo @cstross @nyrath @FredKiesche To an extent and depending on sensor tech level, I imagine. The Spitzer space telescope was unable to find 1I/'Oumuamua, despite knowing exactly where to look for it.

Sevoris,

@sudnadja @c0dec0dec0de @KarlSchroeder @hendric @isaackuo @cstross @nyrath @FredKiesche also: scientific telescopes get hours to days of exposure time to get above the noise floor.

Military-relevant scopes have to work in much shorter timeframes.

Stealth is not a binary. Being low-signature enough where no usable SnR is attainable within the decision loop can be more than enough.

Sevoris,

@sudnadja @c0dec0dec0de @KarlSchroeder @hendric @isaackuo @cstross @nyrath @FredKiesche another aspect of this: modern "stealth planes" are detectable! They just get filtered out. Ships have limited real estate for scopes. Having a low enough signature means no system or human will see an exceptional enough blip to point a scope your way, especially in the heat of battle where hot missile's be eating up scopes!

Sevoris,

@sudnadja @c0dec0dec0de @KarlSchroeder @hendric @isaackuo @cstross @nyrath @FredKiesche like: in space, active sensors will suffer an inverse-fourth power loss of power with distance. Sensors will rely on passive "tripwire" surveillance. Get below the noise floor on those sensors and while x-ray sensors will probably still give them a general warning, that‘s still a long chain until "something is right there!"

Sevoris,

@sudnadja @c0dec0dec0de @KarlSchroeder @hendric @isaackuo @cstross @nyrath @FredKiesche or even if you cannot hide your general presence:

  • you can hide where you are for purposes of getting shot at (an entire shell of the survival onion!)
  • you can hide your hull shape ( class, systems, weapons loads)
  • you can hide your system state to a degree

All of this curtails what the enemy can know and can decide on!

hendric,
@hendric@astronomy.city avatar

@KarlSchroeder @isaackuo @cstross @sudnadja @nyrath @FredKiesche How so? If my enemy is 5 light-seconds away, there is a huge advantage to being able to move 1 ship-length in 4.9 seconds. 300m ship, that takes about 2.5G.

sudnadja,
@sudnadja@vivaldi.net avatar

@hendric @KarlSchroeder @isaackuo @cstross @nyrath @FredKiesche Even more than that: your targeting system is seeing the ship where it was 5 seconds ago, not where it is "now", so you have to guess what the ship will be doing over the next 10 seconds of observed time. And in reality, you might not even know the range to the target with precision. All you really can tell is the apparent visual motion though spherical coordinates. If they're not moving perpendicular to the axis of the beam you're shooting at it, range is changing as well. If they're varying their direction of thrust, range rate as well as range is changing. Even determining if there is a hit, if the player were made to give you an exact spherical direction to shoot in might take a little work (there will be an iterative root finding in there).

nyrath,
@nyrath@spacey.space avatar
sudnadja,
@sudnadja@vivaldi.net avatar

@nyrath @hendric @KarlSchroeder @isaackuo @cstross @FredKiesche At one point we came up with nearly the same approach and that was used for "targeting", where a probability of where the target is and could be is determined, but in the past we had allowed knowledge of range to target implicitly - the full cartesian coordinates of the target were known, just light speed delayed. Later on it wasn't a given that range was known, and it made the solution finding very difficult. (It was sort of fun presenting the 'raw' sensor data to a someone playing as a test to see if they could even determine in a crowded volume of space which of the contacts was stalking them vs innocent movement).

isaackuo,
@isaackuo@mastodon.social avatar

@sudnadja

Of course, this all depends on context of technology assumptions. I tend to assume targets either:

  1. Are military, so they have good passive sensor stealth. Thus, detections via reflected sunlight (narrow cone) or occultation are at best sporadic.

or

  1. Aren't military, so lack active sensor stealth at all.

Either way, active sensors provide continuous tracking data once initial detection is established.

@nyrath @hendric @KarlSchroeder @cstross @FredKiesche

cstross,
@cstross@wandering.shop avatar

@isaackuo @sudnadja @nyrath @hendric @KarlSchroeder @FredKiesche ... Which in turn presupposes currently existing social distinctions (military/civilian) are propagated to a spaceborn polity. And also that sensors are expensive, rather than "external hull surfaces are coated with extruded CCDs able to discriminate single photons at wavelengths from ELF to soft gamma, with similar pixel density to a human fovea centralis (the entire hull is a multispectral interferometer)".

isaackuo,
@isaackuo@mastodon.social avatar

@cstross

FWIW, I do not assume sensors are expensive. I do assume a single photon is indeed detectable, but a cold object with a sunlight mirror isn't emitting photons in your direction unless you're inside the reflected sunlight cone.

And yes, only military craft will bother with this sort of stealth. Solar power is too useful for civilian craft, and this inherently spews photons over a wide angle.

@sudnadja @nyrath @hendric @KarlSchroeder @FredKiesche

Sevoris,

@cstross @isaackuo @sudnadja @nyrath @hendric @KarlSchroeder @FredKiesche Even if sensor surfaces like that are cheap, that still requires you 1) have enough compute to process all the information 2) physics-wise you will never be able to have a soft-gamma sensor with any conventional nano-structure, much less a phased array 3) physics of sensor light requires you still aim that array in a specific direction to gather high-res images, and do it long enough for a worthwhile SnR.

Sevoris,

@cstross @isaackuo @sudnadja @nyrath @hendric @KarlSchroeder @FredKiesche So even if your entire hull is a sensor, I suspect you would quickly find yourself running into a deep decision-making bottleneck of from what specific region of the sky to gather information from.

And of course, if you have the means to process digital interferometer information from the entire hull, the enemy will be able to employ all the tricks modern radar electronic attack taps into

Sevoris,

@cstross @isaackuo @sudnadja @nyrath @hendric @KarlSchroeder @FredKiesche from waveform shifts inducing indications of blue or redshift without physical backing, to waveform distortions indicating different shapes or reflection behavior, to delays and offsets that murky up other indications.

isaackuo,
@isaackuo@mastodon.social avatar

@Sevoris @cstross

Yeah, it's definitely more complicated than simply receiving a photon and knowing this photon is from a target of interest. But there are a lot of sensors that do indeed determine a lot of info from even a single photon. So I take it as a baseline of what's physically possible.

The other type of passive sensor - occultation sensor - is easier to analyze.

@sudnadja @nyrath @hendric @KarlSchroeder @FredKiesche

Sevoris,

@isaackuo @cstross @sudnadja @nyrath @hendric @KarlSchroeder @FredKiesche a hypothesis: there‘s going to be a lot of single photon events in space. The interplanetary medium, especially in a developed system, will be full of chaotic interactions spinning off signals.

isaackuo,
@isaackuo@mastodon.social avatar

@Sevoris

So, let's assume an occultation sensor or photon sensor has detected a potential target of interest. It only has a single bearing hit, at a single point in time.

What I assume happens next is that the sensor platform shoots pings - hard UV/soft X-ray FEL - toward that bearing. This gives range info, as well as speed, and doppler-delay imaging ...

Anything made of atoms will scatter photons in this range.

@cstross @sudnadja @nyrath @hendric @KarlSchroeder @FredKiesche

Robert_Brandt,
@Robert_Brandt@spacey.space avatar

@isaackuo @Sevoris @cstross @sudnadja @nyrath @hendric @KarlSchroeder @FredKiesche One can launch weapons packages that could visual triangulate, and destroy all threat targets.

"Get lit, get hit."

isaackuo,
@isaackuo@mastodon.social avatar

@Robert_Brandt

The challenge with visual triangulation is that you need to be able to see the target to triangulate. If the target is cold, that's ... definitely NOT a given.

Lighting up a target with hard UV lidar lets you track the target, but with a big obvious down-side - the target sees you too! So, it's not a no-brainer. You have consider when/if you want to shine...

@Sevoris @cstross @sudnadja @nyrath @hendric @KarlSchroeder @FredKiesche

Robert_Brandt,
@Robert_Brandt@spacey.space avatar

@isaackuo @Sevoris @cstross @sudnadja @nyrath @hendric @KarlSchroeder @FredKiesche

Recon by fire, if you are not seeing anything, it is probably a good idea to detonated a few nuclear weapons in the area, so as to irradiate the area. Also a bonus of detonating weapons is the ability to fry any eyes looking at you.

RogerBW,
@RogerBW@emacs.ch avatar

@cstross @isaackuo @sudnadja @nyrath @hendric @KarlSchroeder @FredKiesche Given that any useful spaceship drive is a weapon of mass destruction, maybe the real constraint on space trade is the number of people with a psychological profile that would qualify them as ballistic missile submarine commanders.

MeiLin,
@MeiLin@rubber.social avatar

@RogerBW @cstross @isaackuo @sudnadja @nyrath @hendric @KarlSchroeder @FredKiesche
You are forgetting automated raw material barges coming in from local mining installations. And people who think those don't need to be tracked.

Until someone decides to use them as strategic weapons.

In my SciFo world building project, one of those destroys Beijing and leads to cislunar space being locked up for a few decades. Mostly due to a Chinese civil war, an economic crisis and a partial Kessler cascade.

isaackuo,
@isaackuo@mastodon.social avatar

@MeiLin

One of my pet ideas for a long time was deflected asteroid mining - deflect an asteroid at Earth and then mine the crater.

Unfortunately, the idea doesn't work. There is no sweet spot between "mostly burns up in the atmosphere" and "oops extinction level event."

@RogerBW @cstross @sudnadja @nyrath @hendric @KarlSchroeder @FredKiesche

nyrath,
@nyrath@spacey.space avatar

@isaackuo @MeiLin @RogerBW @cstross @sudnadja @hendric @KarlSchroeder @FredKiesche

Well, just for starters, anyone trying this would quickly discover that no insurance company on the planet will cover this.

isaackuo,
@isaackuo@mastodon.social avatar

@nyrath

Yeah but for some reason the Luna-Bank is extremely keen on underwriting the project. Oh well I got the funding, better not overthink it.

@MeiLin @RogerBW @cstross @sudnadja @hendric @KarlSchroeder @FredKiesche

RogerBW,
@RogerBW@emacs.ch avatar

@isaackuo @MeiLin @cstross @sudnadja @nyrath @hendric @KarlSchroeder @FredKiesche On the other hand, it would be a lot cheaper to haul humans and life support to a new crater on the Moon than all the way out to the belt.

Sevoris,

@RogerBW @isaackuo @MeiLin @cstross @sudnadja @nyrath @hendric @KarlSchroeder @FredKiesche the debris contamination in near-earth and lunar orbits will sour the anual balance sheet something fierce though.

RogerBW,
@RogerBW@emacs.ch avatar

@Sevoris @isaackuo @MeiLin @cstross @sudnadja @nyrath @hendric @KarlSchroeder @FredKiesche Surely that can be made someone else's problem. I mean, look at Starlink.

GoblinQuester,
@GoblinQuester@dice.camp avatar

@RogerBW @isaackuo @MeiLin @cstross @sudnadja @nyrath @hendric @KarlSchroeder @FredKiesche
Exactly my thought, smack them into the moon at an angle that minimise the risk for an "Earth hit" and at an location that suitable far away from a moon base.

60sRefugee,
@60sRefugee@spacey.space avatar

@GoblinQuester @RogerBW @isaackuo @MeiLin @cstross @sudnadja @nyrath @hendric @KarlSchroeder @FredKiesche That's the premise of the scifi movie "Moon Zero Two" (1969)

isaackuo,
@isaackuo@mastodon.social avatar

Unfortunately I think the real "deal killer" for lunar lithobraked asteroid mining is kinda boring:

There are already BILLIONS OF YEARS worth of lunar lithobraked asteroid craters on the Moon.

@GoblinQuester @RogerBW @MeiLin @cstross @sudnadja @nyrath @hendric @KarlSchroeder @FredKiesche

GoblinQuester,
@GoblinQuester@dice.camp avatar

@isaackuo @RogerBW @MeiLin @cstross @sudnadja @nyrath @hendric @KarlSchroeder @FredKiesche

But how many of those are the pressssious ones? isn't like 99% of them boring silica/ice things, here we are looking for the juicy metal ones en masse.

nyrath,
@nyrath@spacey.space avatar

@GoblinQuester @isaackuo @RogerBW @MeiLin @cstross @sudnadja @hendric @KarlSchroeder @FredKiesche

Ice can be split into oxygen and hydrogen, which is rocket fuel. Available outside of Earth's expensive gravity well.

isaackuo,
@isaackuo@mastodon.social avatar

@nyrath

Hydrolox is so boring, though, and not really available from orbital atmospheric scooping. I want rocket fuel from orbital atmospheric scooping! (Looking up molecules with Nitrogen, Oxygen, and Carbon ...)

Meh, Nitrous is also BORING ... Carbon Monoxide LOX? BORING!

Oooooh, CYANOGEN-lox. Now we're cooking. Good performance. Very hazardous to humans. Very challenging combustion chamber temps.

@GoblinQuester @RogerBW @MeiLin @cstross @sudnadja @hendric @KarlSchroeder @FredKiesche

RogerBW,
@RogerBW@emacs.ch avatar

@isaackuo @nyrath @GoblinQuester @MeiLin @cstross @sudnadja @hendric @KarlSchroeder @FredKiesche Oxygen is for wimps. Fluorine gets you that extra impulse.

MeiLin,
@MeiLin@rubber.social avatar

@RogerBW @isaackuo @nyrath @GoblinQuester @cstross @sudnadja @hendric @KarlSchroeder @FredKiesche
Flourine?

Boring...

Go FOOF, that's where it's at.

That way you can use everything as a fuel... Even your spaceship.

nyrath,
@nyrath@spacey.space avatar

@MeiLin @RogerBW @isaackuo @GoblinQuester @cstross @sudnadja @hendric @KarlSchroeder @FredKiesche

Yeah, but that's on my list of things I will not work with.

I did enjoy the short shaggy dog by Mr. Stross that featured FOOF

MeiLin,
@MeiLin@rubber.social avatar

@nyrath @RogerBW @isaackuo @GoblinQuester @cstross @sudnadja @hendric @KarlSchroeder @FredKiesche
What makes me somewhat concerned is that Dr. John Clarke never really talked much about FOOF aside from 'interestong chemical', being much more enamoured with ClF3...

hendric,
@hendric@astronomy.city avatar

@GoblinQuester @RogerBW @isaackuo @MeiLin @cstross @sudnadja @nyrath @KarlSchroeder @FredKiesche Research I've seen says there is basically no distance safe from high speed lunar dust from a touchdown/lift-off, let alone minor secondaries from a major asteroid impact. The lack of atmosphere means stuff really goes far.

cstross,
@cstross@wandering.shop avatar

@hendric @GoblinQuester @RogerBW @isaackuo @MeiLin @sudnadja @nyrath @KarlSchroeder @FredKiesche

Lunar escape velocity: 2.38km/s. (Source: https://nssdc.gsfc.nasa.gov/planetary/factsheet/moonfact.html)

Per wiki, "The vacuum-optimized Raptor targets a specific impulse of ~380 s (3,700 m/s)".

So I'm guessing using a Rvac engine to get off the Moon is a really bad idea unless you want to blast things a LONG distance away with hypervelocity regolith fragments.

MeiLin,
@MeiLin@rubber.social avatar

@cstross @hendric @GoblinQuester @RogerBW @isaackuo @sudnadja @nyrath @KarlSchroeder @FredKiesche
Isn't the SpaceX Lunar Starship going to have it's landing and launch engines close to the nose to prevent exactly that?

It's not like that problem hasn't been known for decades and people take it into account...

cstross,
@cstross@wandering.shop avatar

@MeiLin @hendric @GoblinQuester @RogerBW @isaackuo @sudnadja @nyrath @KarlSchroeder @FredKiesche Apparently it is, yes. I'm just astonished it took them so long to swap out the original drawings and recognize there was a problem.

MeiLin,
@MeiLin@rubber.social avatar

@cstross @hendric @GoblinQuester @RogerBW @isaackuo @sudnadja @nyrath @KarlSchroeder @FredKiesche
I seem to remember that it was always like that. Mostly due to fears that moon dust from the landing might damage the vacuum Raptors nozzle extensions.

IIRC, the landing/launch regime is to go only the last/first few hundred meters on the landing launch engines and do the rest on Raptor.

hendric,
@hendric@astronomy.city avatar

@MeiLin @cstross @GoblinQuester @RogerBW @isaackuo @sudnadja @nyrath @KarlSchroeder @FredKiesche I didnt know that, thanks! I'd love to see simulations on the effects though; flaring out the thrust from the nose means more total thrust needed, and with out air to slow it down you'll still hit the soils at an oblique supersonic speed. Maybe the plume expands enough that the density would be low enough to prevent launching boulders, but you're still going to scour fine dust everywhere.

hendric,
@hendric@astronomy.city avatar

@MeiLin @cstross @GoblinQuester @RogerBW @isaackuo @sudnadja @nyrath @KarlSchroeder @FredKiesche I know, use all that delicious cargo space to put a giant low-quality mirror array into space, and use that to melt/sinter landing pads! Plus, you can defocus it to light up polar terrain/power solar powered rovers at the poles.

Sevoris,

@isaackuo @MeiLin @RogerBW @cstross @sudnadja @nyrath @hendric @KarlSchroeder @FredKiesche Venus would make for a pretty "nice" target in that regard. If you mess up your aerocapture, the asteroid will probably just burn up and not even make a crater. And the atmosphere is a neat source of carbon dioxide propellant for sending refined material back out with solar power.

hendric,
@hendric@astronomy.city avatar

@Sevoris @isaackuo @MeiLin @RogerBW @cstross @sudnadja @nyrath @KarlSchroeder @FredKiesche How much deeper is Venus in the Sun's gravity well? Asteroids would end up much faster than at Earth/Moon.

Sevoris,

@hendric @isaackuo @MeiLin @RogerBW @cstross @sudnadja @nyrath @KarlSchroeder @FredKiesche idk, to be honest. But with plasma sails/plasmadynes you can pick up some mean speed anyway.

And besides, considering how hard Earth is as an aerobreak target, Venus may just make more economic sense.

MeiLin,
@MeiLin@rubber.social avatar

@Sevoris @hendric @isaackuo @RogerBW @cstross @sudnadja @nyrath @KarlSchroeder @FredKiesche
It's coming out of 'On the Shoulders of Giants' and 'Seeing Further'. I have to screw over someone on Earth... 😉

Sevoris,

@MeiLin @hendric @isaackuo @RogerBW @cstross @sudnadja @nyrath @KarlSchroeder @FredKiesche tbh I too have considered that one of the kickoffs for space development having an argument of public interest was a "Rama event" so to speak, but instead of an Earth impactor it was a lunar impactor and Earth orbit was just showered with indirect debris.

(One side advantage: a couple cooler years which helped in some other aspects of the polycrisis)

MeiLin,
@MeiLin@rubber.social avatar

@Sevoris @hendric @isaackuo @RogerBW @cstross @sudnadja @nyrath @KarlSchroeder @FredKiesche
In my case it was a local killer, just the size of a small nuke, but enough to kill the entirety of the Chinese leadership, sparking off a civil war, where the parties tried to deny each other space borne assets, leading to a partial Kessler Cascade that took decades to clean up.

Not to mention an economic crisis in the wake of the Chinese civil war. And the collapse of the asteroid mining sector.

MeiLin,
@MeiLin@rubber.social avatar

@Sevoris @hendric @isaackuo @RogerBW @cstross @sudnadja @nyrath @KarlSchroeder @FredKiesche
Leads to 25 Million people of all nationalities being stranded outside of cislunar space, with a grudge towards Earth. Prime Belter/Spacer material.

Though it is much more nuanced. Currently working on writing that one down...

Sevoris,

@MeiLin @isaackuo @nyrath my "belters" are the rock jokeys who drag rocks from the belt down to Venus. Mainly a space-to-space community, a diaspora supported by start-up coops from downwell who‘re looking to space as a new living space now that the old imperial powers managed to trample up earthside. A lot of their work goes back into plasmadyne ships and building long-term communities in space that can eventually support the full flourishing of their peoples.

isaackuo,
@isaackuo@mastodon.social avatar

@Sevoris

I imagine "rock jockeys" as log drivers hopping from rock to rock in space suits, setting them all spinning the right way so they'll Yarkovsky with the rest of the rock herd.

@MeiLin @nyrath

cstross,
@cstross@wandering.shop avatar

@Sevoris @isaackuo @MeiLin @RogerBW @sudnadja @nyrath @hendric @KarlSchroeder @FredKiesche Think big: dump the largest snowballs you can find on Venus. Aim to blast loads of the current atmosphere into orbit, crack the crust, hydrate it, and then churn up the upper mantle until you can get convective subduction going and start plate tectonics. Who knows, a few hundred million years of this and you might even make a start at terraforming!

InkySchwartz,
@InkySchwartz@mastodon.social avatar

@cstross @Sevoris @isaackuo @MeiLin @RogerBW @sudnadja @nyrath @hendric @KarlSchroeder @FredKiesche

A few hundred million years!? But I want it now! (Geologically speaking)

Sevoris,

@InkySchwartz @cstross @isaackuo @MeiLin @RogerBW @sudnadja @nyrath @hendric @KarlSchroeder @FredKiesche ‼️ trade alert ‼️

I get: planetary-sized solar power swarm with 100% intercept rate

You get: carbon snow-out in 150 years.

Sevoris,

@RogerBW @cstross @isaackuo @sudnadja @nyrath @hendric @KarlSchroeder @FredKiesche forgive the meme, but:

virgin "our drives are so dangerous we can‘t trust people with flying them"

vs

Chad "space infrastructure beam riders" "choo choo railway to the stars"

The best public infrastructure is always a train. Change my mind :BlobHajMlem:

nyrath,
@nyrath@spacey.space avatar
Sevoris,

@nyrath @RogerBW @cstross @isaackuo @sudnadja @hendric @KarlSchroeder @FredKiesche "spaceflight must be all about rockets, right?"

Me: well yes but also Newton‘s third means

> railway in space but it‘s magnetic coils and GLOWING ION BEAMS sent by big space stations

> the most common private spacecraft is basically a sailboat except the sails are made of PLASMA and ride the SOLAR WIND

isaackuo,
@isaackuo@mastodon.social avatar

@Sevoris

I'm definitely not sold on plasma sail concepts, but I do have a thing for superconducting magloops (albeit they do have a lot of engineering ... I'll call them "aspects".)

One possible train-like layout could be a mag-sail on one tip of a string of modules kept taut by artificial spin gravity. In other words, it's like a spinning baton.

@nyrath @RogerBW @cstross @sudnadja @hendric @KarlSchroeder @FredKiesche

PTR_K,
@PTR_K@dice.camp avatar

@nyrath @sudnadja @hendric @KarlSchroeder @isaackuo @cstross @FredKiesche
Longscan sounds kind of like an idea I had (but never used) for playing turn-based space battle games:

In 2D simulation, each ship has a circular (elipse?) destination footprint, dictated by their drive power and turning rate. The ship must end its turn somewhere within the footprint. But the faster the ship is going, the further ahead of it the footprint is.

BRicker,
@BRicker@fosstodon.org avatar

@sudnadja @hendric @KarlSchroeder @isaackuo @cstross @nyrath @FredKiesche
"Where it was" - Coastal/Harbor Defense Artillery had the same problem 1890s-1940s before RADAR was deployed. Analog computation (mechanical & nomigram) provided forecast position based on observed track & speed (=velocity), allowing for time of flight of munitions (and correcting for meteorological conditions, a problem not occurring in vacuum).

sudnadja,
@sudnadja@vivaldi.net avatar

@BRicker @hendric @KarlSchroeder @isaackuo @cstross @nyrath @FredKiesche in any targeting problem restricted to the surface of the earth, light speed delay is not significant compared to the speed of the weapon - your information is never more than a few milliseconds old at worst. When you’re dealing with targets that are several light seconds in distance away you need to accurately predict the “future” motion of the target for a much longer period of time, making the problem more difficult

BRicker,
@BRicker@fosstodon.org avatar

@sudnadja @hendric @KarlSchroeder @isaackuo @cstross @nyrath @FredKiesche

Milliseconds is in one sense correct, and true today with digital communications. But 1898-1941, the millisecond knowledge of a corporal on one tower must be merged with the knowledge of another corporal at the other end of a baseline at central plot, via sync bells and telephonic dictation. People with nomogram slide rules apply wind and other ballistic corrections, and pass the solution to the guns.

BRicker,
@BRicker@fosstodon.org avatar

@sudnadja @hendric @KarlSchroeder @isaackuo @cstross @nyrath @FredKiesche

I'm involved in interpretation and preservation of Coast Artillery fortifications (1775-1949). The maths of the analog computations 1898-1941 are a particular interest.

https://pixelfed.social/p/bricker/678436026496442362

BRicker,
@BRicker@fosstodon.org avatar

@sudnadja @hendric @KarlSchroeder @isaackuo @cstross @nyrath @FredKiesche

Your milliseconds dismissal of long distance surface combat (ship v ship or shore v ship) is only correct once Radar was fielded (1942). It is very much wrong 1898-1941. During that period, the solved sensor-fusion/target-prediction problem was quite analogous to the light-second or light-minute problem.
(And thanks to non uniform atmosphere, harder.
And you have computers, barring a Butlerian Jih*d.)

BRicker,
@BRicker@fosstodon.org avatar

@sudnadja @hendric @KarlSchroeder @isaackuo @cstross @nyrath @FredKiesche

Target prediction is of course difficult if your star-drive provides momentumless in-system maneuver as well.

Or maneuver drive has enough specific impulse for fighters to repeatedly maneuver in space as if they were banking in air or tacking on water.

But only the Golden Age SciFi was that naïve.

JoshuaACNewman,
@JoshuaACNewman@xeno.glyphpress.com avatar

@BRicker @sudnadja @hendric @KarlSchroeder @isaackuo @cstross @nyrath @FredKiesche
Did you just censor the word “Jihad”?

BRicker,
@BRicker@fosstodon.org avatar

@JoshuaACNewman

Yes, I don't expect pattern matching to understand Dune references.

JoshuaACNewman,
@JoshuaACNewman@xeno.glyphpress.com avatar

@BRicker I don’t expect pattern matching to be fooled by asterisks.

BRicker,
@BRicker@fosstodon.org avatar

@JoshuaACNewman

well, back during Eternal September, it worked.
(you may call me "old" now.)

BRicker,
@BRicker@fosstodon.org avatar

@sudnadja @hendric @KarlSchroeder @isaackuo @cstross @nyrath @FredKiesche
(Even when RADAR was deployed, the firing solution still had to allow for target movement during time of flight of munitions and meteorology.
The first of which would apply to laser-ish weapons at light-second ranges also.
Momentum insures changes of maneuver are minimal in short time periods, assume d³X/dt = 0.
Only mythic UFOs exhibit non trivial, non smooth Jerk.)

isaackuo,
@isaackuo@mastodon.social avatar

@BRicker

My main interest in very long range XFEL focused by spaced apart zone plate is non-military, but I've also pondered military use. We're talking ranges on the order of multiple-AU ... targeting delays on the order of minutes to an hour.

This may seem crazy, but it's within the historical delays for (dumb) artillery fires. And given the ranges involved, we're talking continuous bombarding of each other for months.

@sudnadja @hendric @KarlSchroeder @cstross @nyrath @FredKiesche

BRicker,
@BRicker@fosstodon.org avatar

@isaackuo @sudnadja @hendric @KarlSchroeder @cstross @nyrath @FredKiesche

If by "dumb" (an ableist word to be eschewed) you refer to the munitions.
Long range Artillery in the pre-RADAR days was generally quite involved and for non-seeking/correcting payloads remarkably ^precise^. (Not by modern standards of course! )

BRicker,
@BRicker@fosstodon.org avatar

@isaackuo @sudnadja @hendric @KarlSchroeder @cstross @nyrath @FredKiesche
(And aside from terror uses e.g. Paris gun, where target was a whole city. But iirc the WW1 Paris gun projectiles were arguably the first human made objects to rise above the atmosphere - which required a change to their meteorological corrections.)

cstross,
@cstross@wandering.shop avatar

@BRicker @isaackuo @sudnadja @hendric @KarlSchroeder @nyrath @FredKiesche IIRC the manufacturers calculated the precise barrel wear per round fired (after 80-ish rounds, the Paris gun would be toast—new barrel time!) and machined the shells to be fired in sequence with increasing diameter to account for gradual erosion of the barrel liner!

Sevoris,

@BRicker @sudnadja @hendric @KarlSchroeder @isaackuo @cstross @nyrath @FredKiesche depends on. At least for particle beams, the ambient plasma and magnetic field lines will become an influence in various ways. For a mature civ not a showstopper, but certainly an influence.

BRicker,
@BRicker@fosstodon.org avatar

@Sevoris

Yes, an ambient plasma would act as atmosphere for some ^ballistic^ (optic) corrective-calculation purposes!
(I'm guessing (SWAG!) it would have to be rather thick plasma for the reduction in light-speed C implied by the Index of Refraction n to be sufficient to change the set-forward time for target projected position?)

@sudnadja @hendric @KarlSchroeder @isaackuo @cstross @nyrath @FredKiesche

Sevoris,

@BRicker @sudnadja @hendric @KarlSchroeder @isaackuo @cstross @nyrath @FredKiesche less that, more…

There‘s two aspects. One, ambient EM fields have large fields, and can minutely deflect charged beams, and basically any beam will be charged- ion beams don‘t have electron recombination occur instantly, so they‘re neutral plasmas only.

Second, "moot scattering", occurs when the beam interacts with ambient hydrogen

Sevoris,

@BRicker @sudnadja @hendric @KarlSchroeder @isaackuo @cstross @nyrath @FredKiesche so the beam will "swirl" in dynamic ways depending on how ambient medium and plasma and magnetic fields shape this landscape.

BRicker,
@BRicker@fosstodon.org avatar

@Sevoris

Well, you may have demonstrated that Charged Ion Beams are sub-optimal for use within a star-system's inadequate vacuum?

(Coriolis affects on long range terrestrial gunnery (and missiles) are a long known, long solved dynamic swirl in artillery, to extend my "it's been done - without computers" metaphor.)

@sudnadja @hendric @KarlSchroeder @isaackuo @cstross @nyrath @FredKiesche

BRicker,
@BRicker@fosstodon.org avatar

@Sevoris

Either fight in a better vacuum,
or pick weapons suited for the battlespace,
e.g. ones that can accept the peri-stellar approximation of vacuum, vs ones sensitive to the deviations from vacuum there.

@sudnadja @hendric @KarlSchroeder @isaackuo @cstross @nyrath @FredKiesche

KarlSchroeder,
@KarlSchroeder@mastodon.social avatar

@hendric
You're probably right about that. Don't listen to me, I was raised Mennonite on the Canadian prairies. I was taught to think of war as 'that thing where they slaughter us again and the handful who survive rebuild their lives in a foreign land.' So my practical expertise here is pretty much nil.
@isaackuo @cstross @sudnadja @nyrath @FredKiesche

KarlSchroeder,
@KarlSchroeder@mastodon.social avatar

@hendric
--Mind you, I did write five books with war in them in the Virga series. Fleet engagements in zero gravity, too, but the ships were wooden and the engagements often hand-to-hand combat with swords. Pure swashbuckling, pirates, boarding parties, broadsides, the whole bit. But I wasn't striving to be... you know.../realistic/ with that stuff.
@isaackuo @cstross @sudnadja @nyrath @FredKiesche

SteveBellovin,
@SteveBellovin@mastodon.lawprofs.org avatar

@KarlSchroeder @hendric @isaackuo @cstross @sudnadja @nyrath @FredKiesche “Mote in God's Eye” was (quasi-)realistic in that sense. Warships were powered by a fusion-powered reaction drive, with decks perpendicular to the thrust axis. When coasting and not in combat, they'd rotate about the long axis to provide “gravity”. Flywheels were used to spin the ship up and down.

cstross,
@cstross@wandering.shop avatar

@SteveBellovin @KarlSchroeder @hendric @isaackuo @sudnadja @nyrath @FredKiesche I have a soft spot for Iain M. Banks's Culture novels where the tech is 100% rigged for plot purposes BUT the space battles are epic (especially in "Surface Detail" and "Excession").

cstross,
@cstross@wandering.shop avatar

@SteveBellovin @KarlSchroeder @hendric @isaackuo @sudnadja @nyrath @FredKiesche Yeah, but Pournelle's Codominium universe was rigged: perfect black body forcefield, magic jump drive between points of equivalent spacetime curvature orbiting stars, and the Moties STILL couldn't invent hormonal contraceptives!

SteveBellovin,
@SteveBellovin@mastodon.lawprofs.org avatar

@cstross @KarlSchroeder @hendric @isaackuo @sudnadja @nyrath @FredKiesche That's why I said quasi-realistic… (Pournelle and NIven wrote that they started with a plastic model of an imaginary warship and used that as the prototype for the MacArthur (and what a name, but I guess it goes along with Lenin…).) The jump drive was designed, per another essay, to make interstellar travel difficult but expensive, to avoid other plot failure modes.

cstross,
@cstross@wandering.shop avatar

@SteveBellovin @KarlSchroeder @hendric @isaackuo @sudnadja @nyrath @FredKiesche I have a [long-delayed] space opera on the cutting room floor that explores different ideas, in the age of 3D printing and effectively infinite data storage. Maybe it'll come out in a couple of years?

cstross, (edited )
@cstross@wandering.shop avatar

@SteveBellovin @KarlSchroeder @hendric @isaackuo @sudnadja @nyrath @FredKiesche (We expect ships to carry reaction mass. Why not have them also carry feedstock and a printer, so that the core military tech you need is a big reactor, bigger radiators to dump waste heat, and a design library full of weapons and countermeasures?

(The term "energetic merchant cruiser" comes up: it's officially unarmed, stands up to customs inspector scrutiny, but you do not want to fuck with it …)

adamgreenfield,
@adamgreenfield@social.coop avatar

@FredKiesche @KarlSchroeder @hendric @sudnadja @SteveBellovin @cstross @isaackuo @nyrath Peter Watts’s Theseus did this, in “Blindsight.” I found it wonderfully convincing.

SteveBellovin,
@SteveBellovin@mastodon.lawprofs.org avatar

@cstross @KarlSchroeder @hendric @isaackuo @sudnadja @nyrath @FredKiesche I'm blanking on the name of the series and the author, but not all that many years ago there was a series where fleets did include manufacturing ships. It was notable for being one of the few space navy books to worry about orbital mechanics, relativity, and (especially) logistics. (The religion seemed to include the stars as containing or personifying their ancestors. Ring a bell?)

SteveBellovin,
@SteveBellovin@mastodon.lawprofs.org avatar
abs0,
@abs0@mastodon.sdf.org avatar

@SteveBellovin @cstross @KarlSchroeder @hendric @isaackuo @sudnadja @nyrath @FredKiesche sounds like Jack Campbell's Lost fleet. I would say it got even better with the later Lost Stars/Tarnished Knight set.

My favourite Jack Campbell would be his "Lady be good" short story

(Apologies if this overlaps with someone else also answering :)

SteveBellovin,
@SteveBellovin@mastodon.lawprofs.org avatar
sbisson,
@sbisson@mastodon.social avatar

@SteveBellovin @cstross @KarlSchroeder @hendric @isaackuo @sudnadja @nyrath @FredKiesche Graham Sharp Paul's Hellfort's War series did this. Sharp Paul was a retired-AUS naval logistics officer and experienced in long voyages away from port.

cstross,
@cstross@wandering.shop avatar

@sbisson @SteveBellovin @KarlSchroeder @hendric @isaackuo @sudnadja @nyrath @FredKiesche Also worth noting is Walter Jon Williams' "Dread Empire" series: WJW was in the US Navy back in the day …

zakalwe,
@zakalwe@plasmatrap.com avatar

@cstross @SteveBellovin @KarlSchroeder @hendric @isaackuo @sudnadja @nyrath @FredKiesche In my Stardock series, the Stardock does on-demand automated fabrication of entire ships. The ships do not fabricate their own munitions, though.

zakalwe,
@zakalwe@plasmatrap.com avatar

@cstross @SteveBellovin @KarlSchroeder @hendric @isaackuo @sudnadja @nyrath @FredKiesche (Of course, we must also remember that in Iain M. Banks' Excession, the GSV Sleeper Service fabricated an entire FLEET in its engineering bays.)

cstross,
@cstross@wandering.shop avatar

@zakalwe @SteveBellovin @KarlSchroeder @hendric @isaackuo @sudnadja @nyrath @FredKiesche Yup! And then there was wossname in "Surface Detail", a single retired fast picket (aka light cruiser) that wipes out an annoying alien battle fleet en passant in a few milliseconds because it has no time for their shit.

cstross,
@cstross@wandering.shop avatar

@SteveBellovin @KarlSchroeder @hendric @isaackuo @sudnadja @nyrath @FredKiesche I had a lot of fun towards the end of the second draft of this interminably unfinished novel, where the energetic merchant cruiser Wakes Up And Chooses Violence and its thermal dump panels briefly glow hotter than the surface of the nearest star ...

nyrath,
@nyrath@spacey.space avatar
A_C_McGregor,
@A_C_McGregor@topspicy.social avatar

@KarlSchroeder @hendric @isaackuo @cstross @sudnadja @nyrath @FredKiesche if you're fighting at sufficiently large distances then manoeuvres regain importance because you have to factor lightspeed delay into your targeting. If a target is far enough away and can maneuver in such a way as to potentially be in places that are greater than the focus area of your weapon, then dodging and targeting becomes a matter of statistics.

sudnadja,
@sudnadja@vivaldi.net avatar

@A_C_McGregor @KarlSchroeder @hendric @isaackuo @cstross @nyrath @FredKiesche For my own system, we do factor sensor delay or information propagation delay into targeting (as well as beam dispersion), which in effect has turned lasers into point defense weapons and most of the 'ship to ship' action is via self-guided weapons (then programming the guidance system becomes the challenge)

video/mp4

phenidone,
@phenidone@mstdn.social avatar

@KarlSchroeder @hendric @isaackuo @cstross @sudnadja @nyrath @FredKiesche once upon a time, like 20 years ago, I joined an open source effort to build a multi-user "realistic" space battle game.

I think I basically killed the project by pointing out how, at a solar-system scale and without magic, warfare is mostly a game of electronic warfare (sensor arms races and emissions control) and information warfare.

Once you're discovered, it's nukes-on-drones time and goodnight.

synlogic,
@synlogic@toot.io avatar

@phenidone @KarlSchroeder @hendric @isaackuo @cstross @sudnadja @nyrath @FredKiesche one reason I like The Expanse & Honor Harrington novels: they each make effort to portray realistic space fleet combat... that still has drama & still has sparkly sci-fi

long ago I tried making a 2D space combat sim with realisticish physics... from a "fun play" perspective? the horrors, the horrors... debris became a real problem. large exploded ships becomes huge number of tiny fast friendlyfire projectiles

isaackuo,
@isaackuo@mastodon.social avatar

@synlogic

If you want, you can ignore the problem of debris.

The thing is ... natural debris is a real problem, which more or less demands Whipple shielding. The debris from a nearby exploded ship isn't going to be going nearly as fast, so your shielding may be fine with it.

You might want to angle solar arrays parallel to the debris "flow", though.

@phenidone @KarlSchroeder @hendric @cstross @sudnadja @nyrath @FredKiesche

phenidone,
@phenidone@mstdn.social avatar

@isaackuo @synlogic @KarlSchroeder @hendric @cstross @sudnadja @nyrath @FredKiesche yeah, simulation fidelity and gaming fun are two different goals.

I did enjoy the Expanse - it was pretty open about its (drive) magic - despite a few places where an inability to detect ships/drives was sadly necessary for the plot.

tarheel,
@tarheel@mstdn.io avatar

@KarlSchroeder @isaackuo @cstross @sudnadja @nyrath @FredKiesche

I think Stuhlinger (or somebody) proposed this for a Mars mission, except tripartite, not bipartite.

nyrath,
@nyrath@spacey.space avatar

@tarheel @KarlSchroeder @isaackuo @cstross @sudnadja @FredKiesche

Krafft Ehricke designed these. I'm still looking for the tripartite one you mentioned.

tarheel,
@tarheel@mstdn.io avatar

@nyrath @KarlSchroeder @isaackuo @cstross @sudnadja @FredKiesche

He described it to me in person (he was a good friend of my grandfather, Wilhelm Angele, so we spent some time together when I was a kid). Maybe I misunderstood or his proposal never saw the light of day.

nyrath,
@nyrath@spacey.space avatar

@tarheel @KarlSchroeder @isaackuo @cstross @sudnadja @FredKiesche

I'm sure the design exists.

All I am saying is I have yet to be fortunate enough to stumble over an old scientific paper that was blessed with an artist conception. Which is a disappointment that happens regularly to me.

tarheel,
@tarheel@mstdn.io avatar

@nyrath @KarlSchroeder @isaackuo @cstross @sudnadja @FredKiesche

Could a been a coffee-machine proposal. 🙂

I think he also had a plan for crews in each of the nodes to visit each other, like three houses close together being on good terms with each other. Kind of an emotional/social health aspect.

No idea what the mechanics of that would have been. Elevator on the cables?

nyrath,
@nyrath@spacey.space avatar

@tarheel @KarlSchroeder @isaackuo @cstross @sudnadja @FredKiesche

The closest image I've managed to find was this.
And it is more about orientation effect on floor geometry than it was tripart spin habs.

Grey lines are floor contours.

FredKiesche,
@FredKiesche@dice.camp avatar

@nyrath @sudnadja The funny thing is, Weber says the inspiration was another series.

image/jpeg
image/png

RogerBW,
@RogerBW@emacs.ch avatar

@FredKiesche @nyrath @sudnadja I remember spotting a fair bit of Cochrane in there (who of course inspired both Hornblower and Aubrey).

FredKiesche,
@FredKiesche@dice.camp avatar

@RogerBW @nyrath @sudnadja Cochran also inspired David Drake, IIRC (and now my obligatory mention that “I” am in two books of that series. 😂).

FredKiesche,
@FredKiesche@dice.camp avatar

Since Weber also worked on games, as compartments open to space, systems go offline and fusion bottles go critical, I can’t but think of games.

image/jpeg
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image/jpeg

adamgreenfield,
@adamgreenfield@social.coop avatar

@FredKiesche Those miniatures, as I recall, were molded from a very high grade of plastic, yielding lovely surface detailing, crisp snapping-together, etc.

nyrath,
@nyrath@spacey.space avatar

@adamgreenfield @FredKiesche

Gotta love Franz Joseph's Federation dreadnought with 3 nacelles, and the scout with one.

IIRC they had a Constitution class cruiser in transparent plastic, for cloaked.

FredKiesche,
@FredKiesche@dice.camp avatar

@adamgreenfield They were done initially for another game. You could also get glow-in-the-dark and transparent (for “cloaked” ships) as well.

nyrath,
@nyrath@spacey.space avatar

@FredKiesche @adamgreenfield

I had the earlier version: Lou Zocci's Alien Space Battle Manual.

My brother and I played the heck out of that game. Crawling around the floor, using the protractor ship counters, stretching the 10 foot thread to see which part of the enemy ship you shot with your weapons.

https://boardgamegeek.com/boardgame/8046/alien-space-battle-manual

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