The fact that all the shuttle replacement proposals are basically copies of the shuttle or minor variants seems to be a much stronger argument that there’s a real problem.
The space shuttle did not actually work—hence a new version that actually does work is the correct thing to do.
An actually useful space shuttle would be capable of frequent flights, say once a day, would not need crew to push the big button, and would land like the rocket it actually is instead of justifying NASA’s air force affiliation with a few seconds of normal flight like a plane.
Since it would fly once a day, it would necessarily transport smaller cargoes to space: There just is not enough demand yet. So it would be capable of carrying one reasonably slim passenger plus his life support. Larger objects would have to be taken up in bits an assembled in space by a robot.
The current proposals aren’t anything like this. They won’t be anything that could fly once a day. They aren’t proposing anything like that. The current proposed replacement will be able to launch if everything goes well slightly more frequently than the shuttle did. It won’t be nearly as replaceable (crew launch will be an essentially Apollo-style system). The total lift mass will be higher than the shuttle eventually but not for the early versions.
The main systems that are coming from the shuttle are the shuttle booster rockets, and it would have a similar external fuel tank. There’s no engineering reason for doing this. The primary reason is that certain contractors lobbied Congress so that they could keep their contracts for the parts they get to build. There’s a proposal to eventually give the SLS a new set of booster rockets that use more advanced technology and are built to actually optimize the new SLS requirements, but I’m skeptical that this will happen. And if it does happen, there’s only one guess about what company will make the new booster rockets.
This isn’t about taking a flawed plan, learning from it, and making a new version that doesn’t suffer from the old flaws. This is mainly about keeping the same small number of big aerospace companies happy.
The space shuttle did not actually work—hence a new version that actually does work is the correct thing to do.
An actually useful space shuttle would be capable of frequent flights, say once a day, would not need crew to push the big button, and would land like the rocket it actually is instead of justifying NASA’s air force affiliation with a few seconds of normal flight like a plane.
Since it would fly once a day, it would necessarily transport smaller cargoes to space: There just is not enough demand yet. So it would be capable of carrying one reasonably slim passenger plus his life support. Larger objects would have to be taken up in bits an assembled in space by a robot.
The current proposals aren’t anything like this. They won’t be anything that could fly once a day. They aren’t proposing anything like that. The current proposed replacement will be able to launch if everything goes well slightly more frequently than the shuttle did. It won’t be nearly as replaceable (crew launch will be an essentially Apollo-style system). The total lift mass will be higher than the shuttle eventually but not for the early versions.
The main systems that are coming from the shuttle are the shuttle booster rockets, and it would have a similar external fuel tank. There’s no engineering reason for doing this. The primary reason is that certain contractors lobbied Congress so that they could keep their contracts for the parts they get to build. There’s a proposal to eventually give the SLS a new set of booster rockets that use more advanced technology and are built to actually optimize the new SLS requirements, but I’m skeptical that this will happen. And if it does happen, there’s only one guess about what company will make the new booster rockets.
This isn’t about taking a flawed plan, learning from it, and making a new version that doesn’t suffer from the old flaws. This is mainly about keeping the same small number of big aerospace companies happy.