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> Whatever you build, it would land on the moon perhaps once, and never again. But it would also never land on Mars, so it would be a waste to build it for tha
by arghwhat 1y ago
> Whatever you build, it would land on the moon perhaps once, and never again.
But it would also never land on Mars, so it would be a waste to build it for that. Build it for what it will actually spend its life doing.
Not saying SpaceX won't go to Mars, but if/when they do it will likely be several rocket generations later and possibly with specialized rockets, with a significant portion of it being one-time-use as you ain't returning.
- hliyan 1y agoI completely forgot about this. Current aerodynamics and heat shielding are optimized for Earth reentry. They may have to significantly rethink the design for Mars. What they land on Mars will likely be very different from what we see today.
- rtkwe 1y agoEven if it does go to Mars there are some major warts on the design. When you land you're 35-40 meters or so up in the air so there's a whole other elevator assembly needed just to get people out of the rocket to the ground.
- ceejayoz 1y agoWe've been hoisting people and cargo up/down with pulleys and cables for thousands of years. This seems like the smallest obstacle Starship has to face.
- pennomi 1y agoWe’ve been opening and closing doors for even longer and yet it has still posed a challenge for SpaceX when dealing with the payload door on Starship. Space makes even trivial things hard.
- ceejayoz 1y agoSure. But they gotta fix the door, either way. Winching stuff out of said open door seems like a much, much easier task.
- rtkwe 1y agoThe satellite door is completely different from what they'll need for MarsShip, that's even larger and has to function as an airlock. None of what they're trying to do now matters for the Mars door.
- ceejayoz 1y agoThat's a lot of certainty for something that hasn't even been designed yet. The outside door needn't be part of the airlock. It's certainly big enough to have an internal airlock leading to depressurized internal space. The things that make a door that tests fine on Earth break in orbit are likely to be things that need fixing for a similar door on Mars. They won't be all the same challenges, but some will absolutely be shared.
- rtkwe 1y agoOn another planet as their only way on or off of the spacecraft is a whole different level of risk.
- ceejayoz 1y agoEverything's a risk nine months from Earth. A hatch with a winch (or two!) seems likely to be one of the smaller ones.
- Teever 1y agoWhat viable alternative design would not have this constraint?
- rtkwe 1y agoA smaller purpose build lander that doesn't need the fuel capacity for the entire journey would be significantly shorter and could be wider too. That would get it significantly closer. Enough that a simple ladder would be viable so they aren't reliant on a winch/elevator.
- Teever 1y agoSo you're suggesting something similar to the Apollo LEM that will land, and carry enough fuel to return to orbit to dock with something that will contain enough fuel that will return to Earth? Wouldn't that make the mission unfeasible because it requires ISRU of return fuel?
- rtkwe 1y agoThe Starship version of the Mars mission also requires ISRU. At least that's what was presented. https://newspaceeconomy.ca/2022/05/27/how-will-spacex-make-rocket-propellants-for-starship-on-mars/ https://newspaceeconomy.ca/2022/05/27/how-will-spacex-make-r...