Hacker News new | past | comments | ask | show | jobs | submit login

Ironically, Starship has the same problem Shuttle has, basically limiting it on its own to LEO. The payload stage is too big and heavy.

The solution to get Starship and Shuttle beyond LEO is the same: either use up the fuel required for landing and expending the vehicle or orbital refueling.

The difference is that Starship is so cheap it makes both of those options feasible. Shuttle's reusability was supposed to make it cheap, but it ended up costing $1.5 billion per flight.




Orbital refueling is a huge game changer. Interestingly, a formerly important politician (Senator Richard Shelby) allegedly hated the concept:

https://arstechnica.com/science/2019/08/rocket-scientist-say...

There is another thing sets apart Starship from other launch systems: relatively wide availability/manufacturability of its fuel outside of Earth. You won't find kerosene or hypergols on Mars or Ganymedes, but methane can be produced fairly straightforwardly there.


Many other rockets work on hydrogen, which is far easier to synthesize than methane.


Not easier to handle, though. Keeping methane in a tank or moving it across some distance is fairly straightforward, as the problems regarding natural gas storage and transportation were solved a long time ago.

Hydrogen is notoriously tricky to even keep in one place, much less pipe across some distance.


> The difference is that Starship is so cheap it makes both of those options feasible. Shuttle's reusability was supposed to make it cheap, but it ended up costing $1.5 billion per flight.

But that's exactly what people believed about the space shuttle before it launched as well. Let's wait to see Starship actually work before predicting it will be enormously cheap. As it stands, that cheapness is entirely predicated on a completely unrealistic level of reusability (multiple launches per day with the same rocket, when even Falcon 9 requires weeks or months between launches of the same rocket).


You don't have to take Elon's word to know that it'll be cheap. It's being built in the open air under dozens of cameras streaming 24/7 on Youtube. Calculating the time & materials cost for Starship is straightforward.


The problem is not the same...Shuttle's main engines were dead in orbit after jettisoning the main tank. Only OMS thrusters were working and it landed unpowered, gliding to the surface (more like a controlled crash). It would never make it to orbit with the main tank attached. There was no possible way to fuel it, no engines and OMS was not usable beyond LEO.

You have full powered engines in orbit on Starship, "just" need to fuel them :)




Consider applying for YC's W25 batch! Applications are open till Nov 12.

Guidelines | FAQ | Lists | API | Security | Legal | Apply to YC | Contact

Search: