More Bounce to the Ounce(mceglowski.substack.com)
90 points by pavel_lishin 7 hours ago | 11 comments
jebarker 5 hours ago
This is a really enjoyable read. Majiec is a great writer and speaker. A breath of fresh air compared much of modern blog/essay content.
troybetz 3 hours ago
titanomachy 3 hours ago
“Pez dispenser for Armageddon” is incredible imagery
alexjplant 3 hours ago
The Zapp & Roger shout-out in the title is gold too.
tclancy 1 hour ago
Or Pepsi Cola, depending on one's age.
mayoff 1 hour ago
This idea is a significant part of Anathem by Neal Stephenson.
PopAlongKid 29 minutes ago
Also featured in the 1985 novel Footfall by Niven and Pournelle.
Chu4eeno 44 minutes ago
Anathem was so chock full of interesting ideas, too bad the last parts of it were so rushed (or at least felt that way to me).
lern_too_spel 30 minutes ago
That's most of Stephenson's books. 90% world building and then 10% story at the end.
foobarian 3 hours ago
Article briefly talked about delivery, which is tricky to do precisely at best of times, but didn't really mention how to address delivery into a nuclear blast. Hundreds of meters behind the craft about once a second doesn't seem like it would be enough time for the blast to clear so would get in the way of sending a new capsule backward. Anyway I'm sure it's just an implementation detail
idlewords 1 hour ago
A lot of the work was done to a design point of 0.25 seconds, and Dyson's book says the issue there wasn't the blast clearing, but just being able to move the machinery fast enough. I kind of share your puzzlement; I can see the blast clearing this quickly in space (the debris moves at tens of thousands of km/sec) but not in the atmosphere.
jcs 1 hour ago
In a vacuum, there isn’t a fireball hanging around for the next charge to cross; the plasma is moving outward at thousands of km/s.
pfdietz 3 hours ago
I've thought that if this idea is picked up it would have to be in space. Testing the rocket on the surface of the moon (point the plate straight up) would probably have been necessary anyway. Ordinary chemical rockets can be tested on the Earth's surface, this concept, not so much.

This is among the reason I've thought nuclear waste should be disposed of in space. Send the stuff onto the moon; if future lunar inhabitants want to mine it for plutonium in the naturally radiation-soaked landscape that is the lunar surface, let them.

IAmBroom 2 hours ago
> This is among the reason I've thought nuclear waste should be disposed of in space. Send the stuff onto the moon

Congrats; you have come up with a way to make nuclear waste disposal 100x more dangerous and 1000x more expensive!

pfdietz 1 hour ago
You need to think more clearly about this.

Reprocessing is very expensive; $1000/kg and up. Launch to space will likely become much cheaper than this as fully reusable launch vehicles become available. Even if the spent fuel must be armored against accident the cost of launching it to LEO, and then to the moon, is likely to become much cheaper than the cost of reprocessing it here on Earth.

Space disposal has the positive advantage that the seven very long lived fission products are removed from the biosphere, along with the very long lived actinides like Np-237.

pwg 2 hours ago
And set the stage for "Space 1999"'s lunar escape from earth.

https://en.wikipedia.org/wiki/Space_1999

polynomial 1 hour ago
Nice set design, but honestly unwatchable. An accidental testament to the genius of ST:TOS.
3 hours ago
MarkusQ 4 hours ago
> There are some drawbacks to the nuclear bomb rocket.

You don't say.

psadri 3 hours ago
A version of this idea was mentioned in one of the Three Body Problem books. There, the bombs were pre-positioned along a path and detonated sequentially like dominos, with a vehicle riding the blast waves.
kurthr 2 hours ago
It is more similar to the Medusa method. Lots of ideas have been proposed. One problem is getting the nukes prepositioned (and they won't easily stay in one spot!) with chemical rockets is quite challenging (rather than carrying them and launching them along the way) and also they would actually need to be set in groups of 3 to provide balanced forces along an axis, or alternately along a parabolic helix to compensate for directional errors.

https://www.centauri-dreams.org/2024/04/17/medusa-deep-space...

nicbou 4 hours ago
Note: there is a paywall much later in the post, but even the free part is a wonderful read.
GoatOfAplomb 3 hours ago
I think this set a record for me on how much article was available before the paywall.
idlewords 1 hour ago
I am trying to be friendly with the paywall.
5 hours ago
samatman 2 hours ago
Why say 'brisance' when you could say 'jounce per ounce'.
mc32 5 hours ago
Wild cowboy ideas of yore. Will we ever be able to make it safer to use on earth or would we save that for a moon base -get to the moon and from there blast away with these atomic fahrting machines…
showerst 1 hour ago
With any luck, by the time we're serious about sending big spacecraft out and about we'll have figured out a workable fusion drive. You'd still need to launch them from space since they're a little spicy from a "don't stand downwind" perspective, but unimaginably better than using nukes against pusher.
jerf 8 minutes ago
There are other possible fission options that don't involve detonating actual bombs out the back of the rocket: https://en.wikipedia.org/wiki/Nuclear_propulsion#Spacecraft

I'm a fan of the nuclear lightbulb myself: https://en.wikipedia.org/wiki/Gas_core_reactor_rocket#Closed...

Sometimes I think that while it may be appealing to mine gold or platinum or whatever out of the solar system, what people really need to figure out how to do is mine uranium. While I could advocate with a straight face that maybe we need to freak out a bit less about lifting the occasional few dozen pounds of uranium into orbit, and point out that more radioactive material has already been launched than people realize, it is fair to observe that we probably can't afford to make lifting hundreds of pounds of fission fuel into orbit the sort of routine event it needs to be to really have a space civilization. One of the biggest major issues with any sort of space habitation is access to dense energy sources. You can smooth over a lot of other problems and get a lot more slack in the system if you have a lot of energy available to play with. Part of the challenge with current space technology is that you start out on the very edge of feasibility as it is.

dylan604 3 hours ago
With hindsight being 20/20 and all, it always makes me laugh at how 1950s pro-atomics a lot of things seemed to be. Yes, it was the new, like AI is today so everyone was all about it. Yet there never seemed to be any concerns of the downsides of things like the pesky nuclear waste or fallout. Looking back at films and magazines, the feel of TFA and Fallout are not out of place which is part of what makes them good.
semiquaver 3 hours ago
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badc0ffee 3 hours ago
We must have different definitions of the word "related".
budsniffer952 3 hours ago
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