- cross-posted to:
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- cross-posted to:
- [email protected]
SpaceX’s Starship rocket system reached several milestones in its second test flight before the rocket booster and spacecraft exploded over the Gulf of Mexico.
SpaceX’s Starship rocket system reached several milestones in its second test flight before the rocket booster and spacecraft exploded over the Gulf of Mexico.
Mentioned this in the other branch but:
The Space Shuttle was already a “reusable rocket”. And the Saturn Vs would be recovered and refurbished, where possible. The main issue is that, much like with the space shuttle (and the “Starship” rockets): A LOT of wear and tear occurs during takeoff and re-entry. Reuse involves a LOT of repair and maintenance that often gets short cutted to save money. Which… is what leads to tragedies like Challenger and Columbia.
And I addressed the landing rockets on a pad. It is primarily a function of having MUCH better computers these days. And I was going to talk about how that has already been done but, while checking if Blue Origin also do it, I came up on this
https://www.discovermagazine.com/the-sciences/dc-x-the-nasa-rocket-that-inspired-spacex-and-blue-origin
So… it wasn’t even “never been done before” a decade ago.
The big reason why we moved away from the Space Shuttle was… well, mostly Challenger and Columbia. It got that “This is bad technology” juju. But also, the costs of reuse are significant and drastically increase the cost per payload. I’ve read some good articles that argue we could make a MUCH cheaper and MUCH better space plane with modern tech but I am not qualified to assess that.
But… that also applies here. Having a rocket that lands itself is great and significantly reduces damage from recovery (whether it is thumping wrong in the ocean or getting damaged in transit). But that means you need a lot more fuel and a lot more weight for all the advanced maneuvering systems. And as you actually get out of the atmosphere, you now are increasing those costs considerably.
Whereas the old capsule system, while not sexy in the slightest, “works”. Get the payload into space and then, when ready, use a minimal amount of fuel to de-orbit in a controlled manner and deploy a parachute once you aren’t on fire anymore. But the main drawback to that is that the pod itself is incredibly limited in size and scope. With most modern missions expected to dock at a space station this matters a lot less. But I expect a return of a “space plane” design if we ever actually do a crewed mission to Mars.
The shuttle was hardly reusable. Yea, the airframe was, but after the first launches NASA discovered how fragile it really was.
Had they taken SpaxeX’s approach, they would’ve discovered those issues much sooner and been able to correct them instead of mitigate them.
What we’re seeing play out is an Agile project vs Waterfall project.
Agile, as the name implies, enables small, early course corrections so you don’t waste effort and get stuck with something you weren’t intending.
We’re also seeing the difference between private sector risk management vs government. (Risk isn’t just “exploding rocket”, but risk to the investment of time, resources, opportunity, etc).
The space shuttle was a bus on boosters we had to fish out of the ocean. It was expensive and had a very limited cargo capacity.
Okay?
I mean, I very much forget what the “marketing” was. But like I mentioned above, the real value is the crew and scope of missions. You have a lot more space to move around and do Science! and whatever else.
The dragon capsule and falcon nine is a bus on boosters. It can only deliver people OR cargo. Not both.
The space shuttle could deliver crew, cargo, and mission modules in one launch. It was a very versatile and 75% reusable too. Compared to falcon which is only about 50% reusable.
The fastest turnaround time for a space shuttle was 54 days pre Challenger disaster and 88 days post Challenger disaster. It was very expensive and time consuming to reuse the space shuttle (they basically had to completely disassemble and reassemble the whole thing) which is one of the main reasons it has stopped flying. Falcon 9 on the other hand has a fastest turnaround time of 3 weeks. So not sure where you got your numbers from, but it seems to me that the Falcon 9 is a much better vehicle in terms of reuse.
You should look further into what that 25% difference is as far as cost and labor. Because that number is lying to you.
I’m pretty sure I remember reading that the cost to refurbish the shuttle boosters ended up costing as much or more than new ones.