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About Nefrums

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    Spacecraft Engineer

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  • Location Sweden
  1. 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.
  2. 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)
  3. From their vids it looks like they are making the combustion chamber of the engine out of fiberglass...
  4. 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.
  5. 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.
  6. 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.
  7. Here is my recreation of Apollo 11 in RSS:
  8. I couldn't resist recreating this mission as close as i could to the real thing:
  9. 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.
  10. 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.
  11. I highly recommend the time control mod for long flights. I made mine at x20 time warp, with 100% physics accuracy. But the speed you get is highly dependant on CPU and part count
  12. nice one! the trust chart for the juno on the wiki looks to be very outdated. But how did you manage to get that far when you had only 5 units of fuel left after passing ksc? I had 25 units left and I did not get as far as you did.
  13. I tried to make a long range plane, I hade som initial promising results with a plane flew above Mach5, while using less than 0.04 fuel/s but it took two thirds of the fuel to get up to speed, so it only got 2500km. After several attempts I made a very light wight plane that flew slightly above Mach2 with a fuel consumption below 0.014 with drag of less than 7kN, That actually got 4500km before failing to land...
  14. Landing required? like this: I hope there is no rule against engines exploding on landing..