Shpaget
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Posts posted by Shpaget
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2 hours ago, Spacescifi said:
But what if they did not require the same energy?
You've just unlocked perpetuum mobile tech; we can't have that, can we?
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A T shape is not necessarily stable in rotation.
https://en.wikipedia.org/wiki/Tennis_racket_theorem
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Haven't you already proposed a conventional explosives orion?
Ditto re: pure fusion bomb.
The first does away with the only reedeming quality of orion, the second doesn't exist.
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I'd imagine that if the glass survived the much higher forces of the initial impact, the relatively static load would not be a problem.
That being said, I'd still probably employ the thin ice traversing strategy of trying to apread out as much as possible.
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Anybody recognize the orrery in White & Nerdy by Weir Al music video?
It's in the bubble wrap scene at 2:06.
https://youtu.be/N9qYF9DZPdw?t=126
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9 hours ago, Spacescifi said:
Missiles can maneuver so it is not useless.
Do the math. See at what angle off the plane it no longer makes sense to use this system.
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9 hours ago, Spacescifi said:
Tethers in space will make size less an issue.
Have you done some basic math? What are the forces in the tether, for any reasonably short tether?
9 hours ago, Spacescifi said:I think you are saying that spinning up the entire spacefraft is unavoidable.
Conservation of momentum is a law. You either use rockets to accelerate the missile, or to despin the spaceship.
As for moon base, you still only can shoot in one plane, which makes it rather useless as a weapon, since all you need to do to avoid this missile is to move out of that particular plane.
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That restricts you to launch only in the plane of rotation. As for it being a cheap and effective system, have you seen the size of the Spinlaunch baby facility? Have you compared the forces involved?
Spinning the entire spacecraft can not be overcome by adding mass to the spacecraft (at least not in a sense that it would require less fuel to stop it from spinning).
A conventionally launched rocket can be aimed in arbitrary direction and still maintain high enough acceleration to be formidable.
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9 hours ago, Spacescifi said:
Hmmm.... you may be on to something.... have any connections with aerospace engineers who would be willing to test this out?
Either that or it's ALL you, which is arguably harder.
Using the air around in creative ways should make all the difference though.
I never was much convinced anything other than project Orion could SSTO with a meaningful (40 tons cargo or more) payload.
The problem with SSTO is twofold.
1. Reaching orbit without staging requires a LOT of energy expenditure.
2. Deorbiting will damage the hull on each go so much that I doubt you could do multiple reentries without major hull repair. In fact the only way to avoid fiery reentry is powered deobiting, which is also possible using project orion. Landing the monstrousity would require a significant amount of chemical propellant though, preferably on it's belly since landing on the plate is not advisable.
Did you mean to post this in some other thread, since this one has nothing to do with Orion, SSTO nor deorbiting?
@sevenperforce, instead of electrolysis, perhaps an oxygen concentrator?
Something like this, but not for ants:
https://www.usa.philips.com/healthcare/product/HC0044000/everflo-home-oxygen-system
5l/min of 93% O2 at 350W, which if my math checks out, is somewhat more efficient than electrolysis.
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Never been to UK, so can't say from first hand experience, but from what I've seen, I don't crave any English food.
Then again, my mom was on a business trip to London once and brought back some delicious shortbread cookies. In retrospect, the packaging had a suspiciously tartany graphics.
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Well, that explains all the failures.
It is universally agreed that Jeb's Junkyard is one the best examples of the triumph of unwavering motivation in the face of seemingly insurmountable odds. The unassuming junkyard where it is said some of Kerbalkind's first steps towards the depths of space have been taken, has now become a much larger junkyard, as it had to expand its facilities to accommodate the ever greater demand for spacecraft components. Jeb's Junkyard has become one of Kerbin's most iconic names, becoming far more than just a beloved brand. It now stands proudly as a symbol of the unstoppable Kerbal drive towards attempting the impossible while grossly underestimating the gravity of the situation.
You'll have to excuse the spoilers, posting via mobile is still broken and barely half functional.
SpoilerSpoiler -
7 minutes ago, tater said:
what could be done with large launchers that are pretty cheap
It would still take thousands of Starships to build and furnish the thing. He's talking a lot about the outer shell, but just glossing over the interior, and most of the work is on the inside. Sure, it would be a lot easier to work on it once the thing is pressurized and spun up, but look at the building process of any large building down here. The structure goes up quickly, but that's just a fraction of the work that needs to be done.
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Delusion of the guy is fascinating. Two weeks to build the entire thing (13:45), or is it a month? Not like it matters in either case. No way.
At least he finally woke up and realized that worldwide lottery is never going to fly (at least he hasn't mentioned it in this video).
5 minutes ago, tater said:Below 1000km. Probably equatorial.
He mentioned sun-synchronous orbit (12:55), so his Starship cargo numbers are not accurate.
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Yep, it seems like humanity's going to get a whole bunch of never seen before pretty pictures, and likely some brand new science points.
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I tried to convince my family to properly season one cast iron skillet which came "pre-seasoned" from the store. They reluctantly agreed, so I started the process. Five minutes later "Why is this taking so long. I need the pan.".
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No need to deplete it. It's just as dense* in it's natural mix.
*close enough not to matter for this discussion
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It's a significantly shorter list of sequels that should not be ignored:
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Terminator II: judgement Day
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Terminator II: judgement Day
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SpinLaunch seems to have signed some sort of deal with NASA to yeet a 3 meter long payload on a suborbital test at about Mach 2. Landing using a parachute.
Mach 6 test later this year.
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"That would be you, if I don't get that ring, pronto!"
Had to google it to check, but this exchange stuck with me for 20 years.
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Is it me, or the test fire out of the back of the trailer seems unstable, as in pulsing (bot high frequency brrrrt and occasional stutter)?
They are getting some shock diamonds, but the lengths of them is all over the place.
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21 hours ago, caecilliusinhorto said:
Would it be possible to make a perfectly spherical version of a Prince Rupert's drop in 0g conditions?
I would asume Leidenfrost effect would prevent sufficient contact with water, leading to cooling being too slow.
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Modern air to air missiles have quite decent range.
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That's it! You people are awesome.
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I suppose this is as good a place as any to ask this. My memory is a bit fuzzy on this one, but I'm looking for an SF novel/short story that possibly starts out with a ram scooper ship skimming Earth's atmosphere to replenish the LEO space station's air supply. The setting is, IIRC, post apocalyptic/fall of civilization so the space station is in dire need of air, but can't rely on resupply missions from Earth. The skimmer ship crew (one or maybe two individuals) were born on the station, have lost most of their muscle mass and can not walk by themselves, once the eventually crash land, because the ram scooper is an old piece of junk... something something about landings and walking away from them. The crew is then rescued by a local underground space fan club while the government agents (???) search for them. Apparently there is some feud between Earthlings and space station dwellers.
Does this ring a bell? My guess is it was written by one of the big three, but really have no clue. Any guesses?
Sun Guns Instead Of Lasers For Space Travel
in Science & Spaceflight
Posted
No, because of conservation of étendue.
https://what-if.xkcd.com/145/