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Nefrums

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  1. Nefrums
    https://en.wikipedia.org/wiki/Soyuz_7K-OK_No.1
  2. Nefrums
    I mean people killed because there was a LES.
  3. Nefrums
    Why are LES required anyway? The shuttle did for obvious reasons not have LES. And the total lives saved by LES through out history is -1 (2 saved and 3 killed).
  4. Nefrums
    Fortunately I will not launch any ship from Kerbin, as I use RSS. I started designing this mission well before this change, with the goal of making a Mars mission as realistic and as low cost as possible. I also brake other rules of this challenge, my ksp installera take like 3-4 min to start, and it is not due to a slow computer. I have based much of my mission on the NASA Mars plans. I use life support configs to match the mass estimate of food etc from the NASA plans.
  5. Nefrums
    Basic architecture: Only chemical engins, no isru. 4 kerbal mission. Use the same launcher for everything, loosely based on a real launcher that is about to fly. ~40t to LEO. First send 4-5 unnamed supply missions that put about 10t each on Mars surface. Then construct transfer habitat in LEO with the following launches: 1 transfer habitat. 1 MAV with hypergolic fuel 2 return trip boosters. Also hypergolic. 7-8 methane + lox fuel for the outbound trip. 180 days outbound ~2 year stay and 180 days back.
  6. Nefrums
    I have actually ben trying to do a mission like this, but trying to make it as realistic as possible. RSS, Life support, fuel boil-of, using the same launcher for everything etc. It is turning out to be really really hard to design a realistic mars mission.
  7. Nefrums
    You might want to disallow using tweak scale to make crewed parts smaller.
  8. Nefrums
    https://www.theregister.co.uk/2017/09/05/hurricane_irma_imperils_spacex_launching_its_first_space_shuttle/
  9. Nefrums
    So they have time to repair the pad and build a new VAB after the old one blew away? Edit: Seriously thou, Irma has the potential to cause serous damage to KSC. Lets hope it does not as that could be very bad for spaceX
  10. Nefrums
    The question here is how much fuel can you add before twr gets so low that you get no benefit of adding more fuel. As dry mass ratios of fuel tanks is very different irl and in game and the cost of adding more fuel is very low. This tends to end up with a liftoff twr around 1,2 irl. The main thing that is optimized irl is payload/cost. Amount of dV spent to get to orbit is irelevant.
  11. Nefrums
    This sounded fun! Here is my attempt: 10 parts, 5,91 tons, 6m tall and 5428
  12. Nefrums
    Yes those two are very different....
  13. Nefrums
    Yes. It would be great if ESA could get the same budget share as NASA does, and even that is not that large nowadays. While the GDP of US is ~10% larger than EU, NASA's budget is about 200% larger than ESAs.
  14. Nefrums
    This! Elon has himself said that spaceX will start hiring non americans as soon as the US law allows them to do so. (Q&A section of the ITS presentation, if my memory serves me right) It was something to do with that rocket science counts as weapons research in the US. Tesla on the other hand has no problems with hiring foreign workers.
  15. Nefrums
    This is exactly the reason that i believe that they will try to make the second stage of falcon reusable. To be able to develop and test the technology on "free" launches. It will cut into the payload, so it will not be used on all missions, just like the first stage is not reusable for all missions. I also believe that they will use the vacuum optimized engine for the landings, the ISP will not be good, but the twr on a almost empty second stage should not be a problem.
  16. Nefrums
    A single engine gets a twr of ~4 when dry, (no fuel left). Looking at the videos the first stage appears to be in the transonic region when the landing burn starts. And as the landing burn lasts for about 30s, so it appear to be about twr 2. It would not be a good idea to make the landing burn shorter as the first stage needs to change course. Before the landing burn starts it is on a ballistic trajectory into the sea. So it won't do damage in case of engine faliure.
  17. Nefrums
    Earth is 10 times bigger than Kerbin. (radius) and is 100 times heavier. (You would think that the mass of Earth would be 1000 larger as the volume, but apparently Kerbin is made up of something twice as heavy as the heaviest material IRL ) If we do like in the game approximate the gravity to all be in a point at the center of the planet Earth have a 100 times greater gravity then Kerbin. The surface gravity is the same as the Earths surface is 10 times farther from the center then Kerbins surface. (gravity decreases with r^2)
  18. Nefrums
    From their vids it looks like they are making the combustion chamber of the engine out of fiberglass...
  19. Nefrums
    It is a bit strange that they plan to do a scaled down suborbital launch next month. And from what I can tell that is before any ground tests of the engine.
  20. Nefrums
    What types of payloads that are possible depend heavily on the prize tag. When the launch cost have dropped an order of magnitude, space tourism will kick off for real. Probably ~10-20 years from now. Tourism is a trillion $ industry. When the launch cost drop anoder order of magnitude space mining becomes viable, etc.
  21. Nefrums
    ok, (is there a RSS leader board? ) 3-man Mission +10- 2-man Lander +10- 2-stage Lander (leave the decent-engine on the Mun) +20- Launch escape system in place? +10- Lander stored behind the CM during ascent +20- Lander tucked away behind some kind of fairing? +5- Flawless landing (no parts broke off, Neil Armstrong is watching you!) +10- After succesfull Mun landing dock CM and MM in munar orbit (no swapping ships without docking them first) +10- Plant flag on the Mun (no cumulative, i.e. two flags don't get you 6 points) +3- Spashing down on Kerbin (land on water) +5 103p.
  22. Nefrums
    Here is my recreation of Apollo 11 in RSS:
  23. Nefrums
    I couldn't resist recreating this mission as close as i could to the real thing:
  24. Nefrums
    Orion flew to 5800km above earth. As kerbin is 1/10th scale of Earth. It would be closer to scale if the target was 580km above kerbin.
  25. Nefrums
    I highly doubt that it would be possible to reenter the second stage top first. All the mass is at the bottom. It would be very aerodynamically unstable. It would require huge fins, mounted behind CoM, And CoM for an empty stage is probably not that far above the engine.
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