Cunjo Carl

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About Cunjo Carl

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    Rocket Fancier

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  1. Well, sad news. I got a secondary infection of hand foot and mouth disease which has more or less taken my hands out of commission for a while now. I can't really browse or type, so I can't really interact in the forums any more. If I improve I'll be back! In the meanwhile, be well. Keep healthy! And if you can't fly safe, fly fast.

    1. Ultimate Steve

      Ultimate Steve

      Oof. I hope you get better soon, but better for real.

    2. Cunjo Carl
    3. xendelaar

      xendelaar

      that's sad news indeed. i hope you get well soon! 

  2. I'll put my money on nanoparticles. They can behave like semisolids even when anhydrous, and there's lots of opportunities to make them on the Moon. Definitely looking forward to hearing more!
  3. Could someone please make one of these fireworks in KSP and post a video for me to watch? I'd love to see what people come up with! You can see a slow motion video of one taking off at 5:20. The ones in real life are more complex, but in KSP we can make something equivalent using only the tippe top effect. For extra challenge, maybe try making one with SRBs only. Part clipping is 100% ok, as are DLC and mods. Good luck, have fun, and thanks in advance!
  4. Fortunately the planets themselves can be left on rails, despite orbiting eachother (see the video as an example). A space ship trying to fly between the planets though is another story...
  5. One other thing to keep in mind is changing SOIs at high timewarp is hard on KSP, where rounding errors can cause craft trajectories to diverge rather suddenly. I suspect they won't want closed orbits to constantly hop between multiple SOIs. For a specific 2 body system acting on a craft, I think they can precompute trajectories and toss them into a massive lookup table, like they do in present KSP but with an extra set of variables involved. KSP 2 is going to hog easily 3+GB of memory I'll bet, so 150MB of lookup table won't break their bank.
  6. Perhaps the sun is just sideways? .... /s I'm taking notice of all the space clouds in the back, and thinking this may be in a nebulea? The nearby space clouds are lit only from the top, whereas the distant background clouds are lit diffusely from the back. If it's a stellar nursery, perhaps there's an interesting nearby feature temporarily lighting the otherwise nighttime side of Duna? Sounds good anyways! Gonna wreak havoc on the orbits though....
  7. Someone made a special Gold-Palladium alloy which is apparently so good at cracking hydrocarbons, that the surface builds up a layer of graphite 'coke' at room temperature. This tiny layer is so durable that the alloy becomes effectively one of the most abrasion resistant materials in the world. That's crazy because Gold Palladium itself is pretty dang soft. https://www.sciencedaily.com/releases/2018/08/180816132009.htm
  8. Getting one of these into space would be an undertaking of Kerbal proportions!
  9. Not sure if he counts as fringe, but here's a nice five year design along the lines of your statement. Hugely worth the watch in my opinion, he does a great job explaining the present day of fusion. For present day 'hyperfission' on the other hand there's this reported 1H + 1H -> 3 Kauons + 300MeV reaction. Kinda crazy! Not sure I believe this guy's theory, but his experiment's an interesting one. https://iopscience.iop.org/article/10.1088/1402-4896/ab1276/pdf . It is definitely an easier goal than fusion! Whether it's real...? Probably not, but bizarrely not "definitely not". Still looking into it.
  10. My honest answer would be to go for both! Maybe build in an interesting tradeoff between the two, so the crew needs to make difficult decisions when confronted with a new challenge or one of the drives going offline. Safe travels, come back and say hi some time if the mood strikes!
  11. Glory days of the RPN calculator right there! Also I totally get what you mean. If you know what assumptions to make it can feel rather cheeky what you're able to get away with!
  12. I took a quick peek at the web page for the program you found, and it looks like it does everything my spreadsheet would and then some! My plan of attack was: 1. Find an engine with known: Propellants, mix ratio, expansion ratio, Isp (ASL), chamber pressure, and exhaust exit pressure (guesstimate this last one by looking at exhaust expansion as it exits the nozzle) 2. Use the Isp (ASL) to back-calculate the temperature in the combustion chamber. Just use guess and check iteration until the right temp is found- the adiabatic flame temp can be used as a starting guess. I was planning on using JANAF thermodynamics values and an assumption of fast kinetics and adiabatic expansion (so all points are at equilibrium, and all of the losses are modeled as a simple reduction in combustion chamber temp). The one thing I wasn't sure about is how to deal with the non-ideality of the gas. I was planning to use Redlich-Kwong, but there's quite a few exhaust components I'm not confident I could find critical temps/pressures for. For starters, the ideal gas assumption may be 'close enough' though. 3. Using this combustion chamber temperature, calculate the Isp of the engine for different expansion ratios. Of course real life doesn't really work like this, but the problems caused by the assumptions made here will tend to cancel eachother out. It should come out pretty close! Since you've got the program, maybe give this a go?
  13. No, the equation is just for the Ve term (v3 is the exhaust velocity). The Pe-Pa is something you'll need to calculate within your model/sim. I went ahead and typed in the subscripts so it's a bit easier to read: Cheers!
  14. My grandfather worked in the Mariner program, so he made sure to snatch up some 10yr Apollo Program anniversary stamps when they came out! They started at 8 cents, and became family heirlooms.