Abastro

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Everything posted by Abastro

  1. That's more right. The fuel-pumping could be explained with the root part being the reference point of the craft, but gravity should be applied to the individual part for the ground rover simulation to work right. Besides I don't think tidal force will affect the orbit, when the rotation of the parent body is neglected with the gravity calculation. EDIT: ^ as Gluttony said, what I said happens while warping/not in focus!
  2. Let's suppose that it's possible, and one built a ring around Gilly. Then the CoM of the craft should be very close to the center of Gilly. As far as I know, KSP gravity is always proportional to the inverse square of the distance between CoM and planetary center. Thus gravitation will get mad immediately after the build. This means that the game should be broken in a minute. Contradiction
  3. NSEP - Firefox does it as well. I forgot if it drops 'forum' or not.
  4. @tsgaerospace, My Terrance ll2 can launch 1.8~1.9t payload to LKO in 6000. Call me if you get interested and change your mind!
  5. Yeah. Actually I think the ablator is purely cosmetic (with bunch of mass) It has freaking 3300K of heat tolerance, which is more than enough for most cases! Also it will still shield the reentry heat. What ablator does is just preventing conduction of a tiny bit of heat (from the heatshield to the adjacent part). Provided you don't put any heat-vulnerable part(near 1000K) right next to the heatshield, it won't burn up.
  6. So the heatshield got blown up? Interesting, it has the highest heat tolerance of 3300K..
  7. You're right there. Ablator will burn off in relatively low temperature, so longer reentry definitely means it runs out. But the craft won't explode without any ablator remaining in this case - Is this what you mean?
  8. It's because heatshields are so aerodynamic that the craft don't want to bleed off enough speed with high Pe. So it ends up with longer reentry, where ablator runs out and heat conducts to the shielded parts causing overheating. Besides, parachutes have great heat tolerance - you can, basically, use (radial) parachutes as heatshield. I think it's why the craft sometimes can reenter nose-first. (Probably the craft is more draggy in this way, or there's heat-vulnerable parts at the back)
  9. I recommend composing root part and root sections with heaviest ones. So the root part could be fuel tanks which is rarely drained, or with heaviest dry mass like.. mk1-2 command pod(sigh). And the root section containing the root part would be central section as well with refinin/science facilities. It could help you with wiggling problem, and help even more with Autostrut: Root Part.
  10. Dang, you're right, it explodes. Crew cabin is weaker than I thought.. So it seems that couple of elevon 1 saved my crews' lives. I didn't know this..; EDIT: It also allows control of my craft, so I was happily using it with aerodynamic rockets. Besides, I've been actually putting a radial parachute in front of the ml16 one. Which helps heating problem even more.
  11. Then I need to test with 38km, where it decelerates well while not heating up too fast.
  12. Hmm, it could be the case. I think mk1 pod + crew cabin topped by a parachute won't have heating problem, though.
  13. Let me test again. Probably I recall it wrong.. Will post the result in a day.
  14. That can happen if the craft has bad glide ratio. Reentry has changed recently(1.2), probably you were playing on 1.0.5 or 1.1 back then?
  15. Usually there's no need of headshield on the top of typical command pod, because those parachutes have great heat tolerance.
  16. Strap 2 'Elevon 1' on the craft in mirror symmetry. Deploy them before reentry, and you won't hit the ground before parachute gets deployed. They are basically early-game heat-tolerant airbrakes. Also, it might be better to set parachutes to deploy when risky.
  17. I couldn't find appropriate thread for this, so posting it here. Please post some challenging questions for round Earth 'theory', and the explanations. Mine is not quite challenging, but still I found this interesting: Did you know that kerbal aircraft gets automatically pitched up while in flight? With SSTOs or long-range planes, it's quite noticeable and is sometimes annoying. Though, we can't get the similar effect IRL. No pilot says that they actually felt like their aircraft is pitching up, and any cruising aircraft doesn't seem to pitch up as well. So the question is: Why? If the Earth is round, how can't we get any amount of pitch-up?
  18. Besides, if you unlocked aerodynamics, 2 deployed eleven 1 works really well with reentry issues. It lets the craft decelerate quite fast, and prevent it from getting in streamlined attitude.
  19. I found that Pe of 38km~42km generally works well. Provides enough deceleration while not giving too much heat burning up. Heat tolerant parts(2000K) can definitely handle the reentry even when they are placed directly to the airstream. Also entering parachute-first is helpful as the parachute have excellent heat tolerance. (2600K, it's next to the best) Besides, does it slow down well under 10km? If it don't want to decelerate on transonic speed, then you're definitely in trouble. The spaceship won't land safely, if you don't have drogue parachutes. (i.e. try drogue parachutes if this is the case)
  20. Calculating optimal first stage? I'm looking forward to it!
  21. It's atmospheric ISP of Reliant, which means it only applies on surface level. Isp of the engine will increase quite fast during the ascent, so the final altitude will be higher. Also drag is relatively small effect for an aerodynamic rocket.
  22. I tried to find the optimum for the general case, but I got kinda lost with what kind of restriction I should put on. Should I restrict engines by mass? Also should I optimize mass ratio for dv, or dv for mass ratio? What kind of conditions users would need? This is hard..
  23. This one is old for now, but anyway: I made electricprop-rocket spaceplane SSTO. Developed this rocket while trying to design even SSTO. No single airbreathers included! With better propeller engines out there nowadays, propeller-nuke SSTO is quite feasible. Though Eve sea-level SSTO is definitely out of reach.
  24. EVT is trivial as Well, given that one know relevant concepts pretty well. I think understanding these concepts is hard. I posted the theorem without thinking. Btw, local non-global maxima sounds like 'a local maximum which is not global maximum'.
  25. It's one of the fundamental theorem in real analysis. https://en.m.wikipedia.org/wiki/Extreme_value_theorem The generalized version. This is actually quite hard to prove...