Re: Public company woes
SpaceX has been quoted as saying that Starship V4 could eventually put 200 tonnes into orbit, but let’s leave that to one side and stick with 100 tonnes for now.
What could you actually do with a 100-tonne payload?
The military is obviously very interested. The ability to move 100 tonnes of equipment, supplies or munitions halfway around the world in a very short space of time would have military logistics people drooling.
That becomes even more interesting if you eventually have several launch sites and can launch every six hours, never mind every hour. There is a fair gap between saying that and actually doing it, of course, but you can understand why they are paying attention.
The bit that really interests me, though, is manufacturing and materials science.
Most orbital research today involves small samples and fairly compact experimental equipment. With a 100-tonne payload, you could start talking about something closer to an actual pilot plant:
* furnaces, vacuum chambers and crystal-growth equipment;
* robotic handling and quality-control systems;
* serious electrical and thermal-management equipment;
* tonnes of feedstock;
* spare parts and redundant machinery;
* shielding and containment for anything particularly unpleasant.
Microgravity changes how materials behave. You do not get the same buoyancy, sedimentation or gravity-driven convection that you do on Earth, which can mean more uniform mixing, solidification and crystal growth.
NASA and others are already looking at this for alloys, semiconductors, optical materials, pharmaceuticals and various other advanced products.
At the moment, a lot of that work comes down to producing tiny samples and asking whether anything useful happened.
A 100-tonne launch changes the question.
Instead of asking:
“Can we make a few grams of something interesting?”
you can start asking:
“Can we build a proper pilot line and make enough of it to find out whether there is an actual industry here?”
You could also build research facilities that are simply too large for the ISS:
* variable-gravity centrifuges;
* large electromagnetic levitation furnaces;
* long-duration alloy-solidification experiments;
* high-vacuum deposition lines;
* containerless processing systems;
* biological tissue-production facilities;
* laboratories comparing microgravity, lunar gravity, Martian gravity and Earth gravity.
The value would not only be in producing better materials.
It would give us a far better understanding of how gravity affects crystallisation, fluid flow, phase separation, combustion and solidification. Even where the final product is still made on Earth, the knowledge could be extremely valuable.
There is, however, one fairly obvious problem.
The current Pez dispenser is a Starlink delivery system. It works because SpaceX controls both the rocket and the payload and can design the satellites around the slot.
It is grand for launching stacks of Starlinks.
It is not much use if your payload is a factory, a telescope, a large pressure vessel or some awkward great lump of machinery.
SpaceX has previously shown a general-cargo version with a large clamshell opening and a tilting payload adapter. That would allow a large payload to be released rather than posted out through a letterbox one piece at a time.
For now, though, that remains a concept rather than an operational system.
So Starship may be approaching the ability to lift 100 tonnes, but it does not yet offer anything resembling a general-purpose 100-tonne freight service.
The other fascinating possibility is launching the factory rather than the finished structure.
A large payload could carry machinery and feedstock capable of producing:
* very long beams and trusses;
* enormous radio antennas;
* optical telescope structures;
* pressure vessels and propellant tanks;
* kilometre-scale solar arrays;
* rotating habitats;
* sunshades and radiation shielding.
None of those structures would ever need to support their own weight on Earth.
They could be extremely light, thin and delicate and still work perfectly well in orbit.
Instead of building some enormous structure on Earth, folding it into a rocket, shaking the life out of it during launch and then hoping it unfolds properly at the other end, you launch the factory and rolls of material.
The factory builds it in orbit.
That, to me, is where this starts becoming genuinely transformative.
It is not simply a case of putting 100 tonnes into space.
It is the possibility of putting the beginnings of an industrial base into space.
And if SpaceX gets anywhere close to the cost per kilogram it is aiming for, that opens up possibilities in materials science, manufacturing and engineering that we have barely started to think about.
These exciting times.