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About Elthy

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    Sr. Spacecraft Engineer

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  1. Isnt even Starship/Superheavy already limited by this? Raptor has quite a high thrust/area number and even there the engines are sticking out below the booster a bit (6 beneath the legs). It will propably be hard to build a methalox rocket taller than 150m without dropable sideboosters.
  2. https://arstechnica.com/science/2019/10/corkscrewing-bouncy-ion-drive-would-provide-thrust-in-different-universe/ Its allways the same: https://xkcd.com/2217/
  3. The fuel production plant will not be easy or fast to develop. The easy part is designing one that can produce enough fuel, the hard part is building it light enough to fit in a starship while still being able to resist martian conditions, the VERY hard part is making it deploy itself, maintain itself and mine waterice on its own. Thats not a job SpaceX can do with a few guys in a few years. Elon Musk has lots of fitting companys for this task, but just imagine what kind of technological jump you are going to need to have robots build a solar power plant without external input on earth...
  4. We have a thread for that specific topic:
  5. Well, the Civilization series should be the right thing for you. The newest one is Civilization 6, but Civ 5 is still a good game and is available quite cheap with all addons.
  6. Maybe they are hoping/waiting for the next gen consoles. KSP needs lots of CPU power, there will be large improvements there.
  7. I dont think you need a new PSU for a 2070S and an uspecified 6 core CPU, even if thats an old overclocked Sandy-Bridge-E or similar you are still not realy straining the PSU, except its some cheap chinesium mainly filled with concrete instead of components. Im currently planning a new PC in a small case, too. I will go for the Phanteks Evolve Shift Air, an R5 3600 and keep my RX 480. Will be interesting to see the thermals on that, the "Air" variant should have plenty of airflow with those large mesh surfaces.
  8. Dont forget that it also has a bigger power draw resulting in more heat. This is allready a challenge in small cases, so i would recommend to go with the smaller option.
  9. Is the wall we see around the engines the outer hull or do you think there is another layer beyond that? If this is the outer hull i dont see how they want to fit legs in there, maybe they will be added to the outside.
  10. Two things: What happened to Mk2? All current updates are about Mk1 in Texas... I realy wonder if they will be able to lower the dry mass from 200t to the proposed 85tons from the 2017 presentation. They need top add lifesupport and other interior stuff with that budget, too, it seems realy optimistic...
  11. Those look very small, i kinda doubt enough fuel fits in there for landing. Maybe its a ballast tank to simulate a varrying payload...
  12. Yeah, the old plan of using the normal tanks as dewars for the header tanks sounded realy good. Maybe issues with structuraly supporting them under engine power when the main tanks are empty?
  13. My bottle opener arrived, thanks a lot! Im currently not in a position to use it, though, several weeks of intense learning for tests are ahead of me...
  14. War just increases the technological developments in small but highly visible areas (e.g. aviation), but drasticaly hinders everything else. Also look at the current times, the western nations havent had a military conflict on their homeland for decades. At the same time we see technoloigical revolutions in ever increasing speeds, especialy in information technology. If you dont have to worry about being shot or bombed to death you will have more time for science...
  15. Both pure water rockets and soda+vinegar rockets work by pressing water (vinegar is mostly water) out the nozzle at high speeds. The difference is that a water rocket has its pressure supplied form the outside by a pump while the soda rocket creates it with a chemical reaction. You can improve both by increasing the pressure inside the rocket, here your limit is the valve and the bottle. The valve of the soda rocket is supposed to fail, you "just" have to make sure it happens later, so thats an easy way to optimise it. If the bottle becomes your weak point (i hope your are wearing safety glasses even at bigger distances) you can try reinforcing it, e.g. by wrapping firbe reinfroced tape around it. Edit: There is a limit on how much pressure a soda+vinegar reaction can create, im not sure if its low enough to be reached by household stuff. You will notice it if the rocket cant press the plug out anymore.