281500+ entries in 0.164s
mircea_popescu: no prob. just didn't want for you
to get
teh idea i just said
that
to give you busywork or somesuch.
the
thing's actually important.
Framedragger: mircea_popescu: not yet, and
that's due
to lack of
time, and generally lazy vibes over
the summer (a festival or
two, reading books etc) i know i should
take a careful look at v, and i dun want
to botch it, hence
terribly slow with it
a111: Logged on 2016-07-12 17:49 mircea_popescu:
http://btcbase.org/log/2016-07-12#1502056 <<
this is what you get for sending ustards
to college.
they "adapt" what
they read
to
the "practical needs" in
their environment. problem ?
mircea_popescu: it's
the comic equivalent of a fat ugly woman
that doesn't wash or ever shut up.
mircea_popescu: you mean other
than "i want
to make a comic and don't perceive i should invest into drawing or writing skills, whoever loves me loves for me!" ?
BingoBoingo: "Taylor appeared at an arraignment Monday in St. Louis County Circuit Court,
telling Judge Joseph Dueker
that he wanted
to represent himself “pro per.”
The legal
term
to represent oneself is “pro se.” Dueker
told him he didn’t know what “pro per” meant and gave
Taylor until July 27
to decide how he will be represented."
Joshua-I: I will return
to ebbits and curry
Joshua-I: I hope it looks even more ridiculous
than it does now
mats: i'm not gonna volunteer, but i
think humans wanna get off
this rock and
thats not a
terrible idea
mats: mircea_popescu: on
the matter of post-oil, i do wonder what
the world would look like in 10, 100 years after cold fusion
Joshua-I: Well it sounds pretty
tame for burning man
ben_vulpes: Joshua-I: i did not know
that
tungsten was psychoactive
mircea_popescu: this sounds just like
the shittier fraternity on campus.
ben_vulpes: two more hours of
that, i leave
to go
toodle around on vehicles on
the desert. come back, he's asleep on
the couch, head deep in five gallons of orange.
ben_vulpes: i strolled out of my
tent at ~9a
to him drinking directly from
the bottle. said, "i'm drunk! what do you
think about
that?" "psh, you're nowhere near drunk"
ben_vulpes: i witnesesd a feller at burning man receive
the moniker of 'princess buckets' one
time.
ben_vulpes: today we learn
that mircea_popescu has
tiny bukkits
mircea_popescu: we'll discuss stability afterwards, as a sign of me not
thinking i'll have
to.
mircea_popescu: but otherwise - i have here
this battery, contained in a
thin PET cover, ready
to do ~1,2 MJ at my command. go, construct battery, compressed coil, box of covenant or lavey's
teeth assemblage
that can do a mj and fit in a gallon.
☟︎ mircea_popescu: much like
the current "something better" wall materials kids kick holes into aren't better
than brick and concrete. even if some claim otherwise.
mircea_popescu: mats yeah, in a post-oil world all sorts of
things might make more sense.
mircea_popescu: oh and
the caper : obviously
the coil is a lc oscillator.
the remainder 95
to 99% energy doesn't simply disappear. it COMES BACK in
the circuit. going...
the other way.
mats: i see your point
though
mats: there is
the benefit of a nuclear reactor driving
the gun
mircea_popescu: ben_vulpes he says
the words, "because kids have brain damage".
mircea_popescu: if you just dump
the fuel on enemy, you get 500x bang for
the buck. eventually you cook him,
through whatever bunker. it's why
there's no bunkers in
the sun.
mircea_popescu: by and large for every 100 J worth of gas you're putting in, you're getting out ~1J of ~muzzle velocity~.
then as ben_vulpes pointed out correctly you lose most of
this
to air friction (longer range ? MUCH MORE FRICTION!), so you deliver maybe 1kJ or 2 per MJ expended.
mircea_popescu: thing - and proper cored items are way
the fuck
too expensive
to be destroyed over
three firings.
a111: Logged on 2016-07-13 04:32 mircea_popescu: mats it's very hard
to beat plain and simple fire-air bombs. you gotta put electricity
through coils
to make
the projectile go magnetically, electricity which you got from a combustion generator in
the first place.you're about five
transforms away, might as well just put
the same gasoline in a bottle and
throw it at
the enemy.
mircea_popescu:
http://btcbase.org/log/2016-07-13#1502308 <<
to put numbers on
this : as it recently came out in debate with alf, diesel generators get ~40% efficiency if large enough (closer
to my guess
than yours! ha-HA!) ; depending on
the coil design
the resulting electricity will be
transferred
to projectile somewhere around 1
to 5% efficiency.
to go higher air-cored assemblages are excluded because of
the high reluctance of
the damned
☝︎☟︎ ben_vulpes has not heard
the
thing since his youth. on vinyl!
ben_vulpes: what, for
the novice parents, is
the braindamage in cosby's routine?
mircea_popescu: btw, you folks know
teh epic bill cosby series on parenting ?
mircea_popescu: i'll grant
that it has more chances of being useful
than
the coil gun ; which isn't saying much.
ben_vulpes: if it works (and what,
the brits can't do anything, clearly), it's
the only improvement with legs over
the classic rocket.
ben_vulpes: leave atmo, cut over
to internal fuel supply.
ben_vulpes: so, keep water from precipitating out of
the gas coming in, cool it rapidly by dumping
the heat into
the h2, react h2 and o2 (and yes, some h2o), you have an air-breathing rocket
that (yes, nominally) can operate in atmosphere with out consuming onboard o2 all
the way up
to mach 5.
ben_vulpes: and so long as
there is o2, it *will* burn.
mircea_popescu: werll for
that money, keep gas from growing fat after marriage, you got desktop cold fusion.
ben_vulpes: keep it from doing
that, you have cold, high pressure ambient gas you can dump into a steady state reaction chamber.
ben_vulpes: it wants
to freeze over
the intercooler hooked
to
the h2.
mircea_popescu: but your problem was
that it dun wanna go, it wanna freeze over your assemblages
ben_vulpes: mass in rocket exhaust is a /good
thing/ ffs.
mircea_popescu: atmosphere contains water.
this is a problem, because mass.
mircea_popescu: ben_vulpes yes yes.
the comparison of
the engine
to
the rocket is flawed. because
the rocket doesn't aspire [random gunk] from atmosphere.
ben_vulpes: $google more
things under heaven and earth
ben_vulpes: srsly
this is kindergarten rocket chem
ben_vulpes: mircea_popescu:
turns
to steam helps with isp
mircea_popescu: asciilifeform
that's pretty insane seeing how rocket can maneuver.
mircea_popescu: ben_vulpes it's a simple problem of mass conservation
though. if your compression factor is 1:10, say, and you burn 1
ton of fuel, you
then
therefore get a cubic kilometer worth of air, which will contain a
ton and a half of water, what do you do with it. it doesn't burn, it doesn't go away. nowwut.
mircea_popescu: mats it's very hard
to beat plain and simple fire-air bombs. you gotta put electricity
through coils
to make
the projectile go magnetically, electricity which you got from a combustion generator in
the first place.you're about five
transforms away, might as well just put
the same gasoline in a bottle and
throw it at
the enemy.
☟︎ mats: you've got him now, he's going
to
talk about rockets for hours
a111: Logged on 2016-07-13 04:29 ben_vulpes:
the only new part of
the whole system is
the precooler
to
take air at mach5 and cool it without frosting everything over.
ben_vulpes: but like cold fusion, railguns keep usg contractors in
the procurement pipeline.
ben_vulpes: the further away your
target is,
the less useful
the railgun and
the more useful
the classic icbm.
mats: i suppose
the real advantage would be
the raw kinetic energy being delivered
ben_vulpes: the only new part of
the whole system is
the precooler
to
take air at mach5 and cool it without frosting everything over.
☟︎ ben_vulpes: mircea_popescu: once it leaves compressible atmo, it cuts over
to internal o2 supply fed directly into
the *same* combustion chambers.
mats: ben_vulpes: well,
they
tend
to be unguided
ben_vulpes: the *single best bet* on orbital advances in my lifetime is
the mach-5 airbreather.
mats: its a solution
to certain
tactical problems, but none in
the civilian arena
ben_vulpes: mats: sure, but how do rockets not solve
this better and more cheaply
ben_vulpes: bonus, you can point
the latter. not so much for either
the cannon or railgun.
mircea_popescu: anyway, iirc us navy launched a breadbox sized item at about 10km/s or somesuch. cost a little more
than a littoral com-sunkship.
mats: being able
to hurl a rock at enormous speeds over
the horizon seems like a useful capability
ben_vulpes: at
that point, you may as well save on fab and engineering costs and submerge a hydrogen gun right under
the water
ben_vulpes: not
to mention
the accelerations involved make it more or less entirely impractical for anything other
than raw materials.
mircea_popescu: it dun work worth a shit, electromagnetism is a self-limiting disease so
to speak, but hey.
mircea_popescu: mats you're not
the first.
that
thing's been a solution in search of a problem since ~1916.
mats: i wonder about
the feasibility of railgun-assisted orbital launches
mircea_popescu: has
the added benefit
that it makes me
think
they have no fucking idea what
they're
talking about.