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Everything posted by StrandedonEarth
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Starlink Thread (split from SpaceX)
StrandedonEarth replied to DAL59's topic in Science & Spaceflight
Rich country: one family shares a Starlink terminal. Poor country: entire village shares one Starlink terminal. Still a huge step up for that village, which previously had no internet whatsoever. They need to add a bonus offer “Buy 1/5/10kW of Tesla Solar + PowerWall and receive a Starlink terminal absolutely free!!** ** subscription charges apply” -
Mars Rover Perseverance Discussion Thread
StrandedonEarth replied to cubinator's topic in Science & Spaceflight
Meanwhile, back aboard Percy... -
totm nov 2023 SpaceX Discussion Thread
StrandedonEarth replied to Skylon's topic in Science & Spaceflight
Any tweaking the shape (cylinder vs ????) for a slightly lower terminal velocity would not be worth losing the simplicity of cranking out cylindrical shapes. Anything else adds complexity/cost/mass/time -
Mars Rover Perseverance Discussion Thread
StrandedonEarth replied to cubinator's topic in Science & Spaceflight
Yeah, it looked to me like it dropped quickly at first then slowed its RoD -
Mars Rover Perseverance Discussion Thread
StrandedonEarth replied to cubinator's topic in Science & Spaceflight
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That doesn't inspire a lot of confidence in New Glenn flying regularly anytime soon.
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When You Need Less But Big Rocket Nozzles
StrandedonEarth replied to Spacescifi's topic in Science & Spaceflight
Have you read Liftoff! by Eric Berger yet? I just finished it; it was a good read. Interesting tidbit from the book: In the early days of Merlin development, they had to make that choice between ablative and regenerative cooling. Despite already wanting to re-use rockets eventually, Mueller and Musk decided regenerative would have too many headaches early on when they needed to get the engine working. So they decided to go ablative at first, which proved to have its own set of headaches, adding weight and robbing performance. So Merlin and Merlin 1A were ablative, and Merlin 1B was abandoned when work on the regeneratively-cooled Merlin 1C proved to be surprisingly straightforward and problem-free. They would have saved a lot of problems and headaches if they had started going regenerative from the beginning. -
Something like the Dynetics system will eventually be needed for the low ladder height, although it may take a few more iterations. Completely modular would be the way to go. Swappable and refillable tanks, along with a detachable central cargo/crew module. Land, detach, refuel, lift back to orbit for the next run skyctane style
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As I recall, a Starship could SSTO but not land, any payload would depend on what the final dry mass of the craft turns out to be. And who knows how much mass will be added by equipping the shell for mid-term human missions. I'm really curious about how that skin stands up to MMOD.
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totm nov 2023 SpaceX Discussion Thread
StrandedonEarth replied to Skylon's topic in Science & Spaceflight
I’d like to think it’s to give Congress a wake up call of the “bucket of water” sort. You want your buddies to get contracts? Then buck up! -
totm nov 2023 SpaceX Discussion Thread
StrandedonEarth replied to Skylon's topic in Science & Spaceflight
Docking? More like “swallowed by” -
Yup, my kerbals land like this all the time.
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For Questions That Don't Merit Their Own Thread
StrandedonEarth replied to Skyler4856's topic in Science & Spaceflight
I have to admit that General Atomics is a great name. It just smacks of pure 50's sci-fi. It would be awesome for that name to be a major player in space, up there with NASA, ULA, SpX, BO, NG, etc... -
Crane is my favorite brand of plumbing fixtures; it seems every house I lived in had "Crane" stamped on all the fixtures. Now they're owned by American Standard, so I guess that makes them my favorite Crane manufacturer. And there's also Crane Supply...
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totm nov 2023 SpaceX Discussion Thread
StrandedonEarth replied to Skylon's topic in Science & Spaceflight
From looking at this, I start to wonder if they want to do some sort of structural testing with the forward flap actuators, to better understand the dynamics and verify simulations/calculations, including checking for fatigue? -
totm nov 2023 SpaceX Discussion Thread
StrandedonEarth replied to Skylon's topic in Science & Spaceflight
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totm nov 2023 SpaceX Discussion Thread
StrandedonEarth replied to Skylon's topic in Science & Spaceflight
Is this an Imperimetric unit? Standard Imperial What they really need is some sort of extra air brake near the nose to pull the nose up. Skipping the wild sloshing of the flip burn maneuver. -
totm nov 2023 SpaceX Discussion Thread
StrandedonEarth replied to Skylon's topic in Science & Spaceflight
Pure conjecture here, but there may be another reason for the 9m GSE tanks: to reduce the physical footprint I don’t know how much prepared land they have, or what kind of foundation those 100 kilogallon tanks need, but a vertical 9m 400 kgallon would have a much smaller footprint than four skinny 100 kgallon tanks, not to mention plumbing them altogether would be simpler (not a big issue, I’m sure, but still). Sure, Starbase is surrounded by empty land, but it needs to be preloaded to support any significant weight, and that takes time (a year at least, IIRC) So if they’re running low on preloaded land, they may have gone this route to save space. Commercial suppliers would have charged through the nose for custom tanks of that size, and probably have to retool. Then there’s shipping (or barging) on top. So while it may have been cheaper to buy enough 100kgal tanks, it’s almost certainly cheaper to build their own 400kgal tanks, and they take up less space! Sure, they had to buy stock tanks to get going while the factory was getting set up and proofed. But now that they can build their own, why not? Again, pure conjecture about a possible reason, even if not directly cheaper then COTS. Definitely cheaper than preloading more land... And remember, commercial suppliers expect to make a profit unless dumping excess stock. SpaceX does not need to profit on tanks. -
Mars Rover Perseverance Discussion Thread
StrandedonEarth replied to cubinator's topic in Science & Spaceflight
As I understand it, they landed in the outflow from one of those channels -
totm nov 2023 SpaceX Discussion Thread
StrandedonEarth replied to Skylon's topic in Science & Spaceflight
Ms. Tree and Ms. Chief have given up the chase and are headed for other waters. Hey, at least they tried, but it seems catching them was trickier than expected and fishing them out of the sea is good enough.