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occar

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Everything posted by occar

  1. I added some wheels for Ojimak 760 m/s!
  2. I also have slightly faster versions that I made after the first post
  3. However, if separatrons are your thing... Here's the fastest so far at 743 m/s. I made a video as proof that this thing actually stays on the ground. Wheels are just dead weight. There's probably room for improvement, but I just stopped as soon as I passed the previous best.
  4. I didn't want to do separatrons, so I did this..... (somewhere around 350 m/s, jeb style)
  5. That's what's killing you. If the weight is too much for lifting at all. Did you try leaving the extra fuel on board and just allowing it to burn off until you could liftoff (this would let you take off with max fuel that you can lift)? Or did the extra fuselage weight itself cause the issue? Once you're getting aerodynamic lift off the control surfaces (even just rocket fins), the weight is less of an issue.
  6. How fast did you get in atmosphere with your jet engine? If you didn't get upwards of 2km/s velocity with it, you're losing a massive amount of potential delta V due to inefficient launching. Jet launching is much, much different than rocket launching. You need to stay in the low 30's of km altitude until you get your jet's top speed, then start climbing again, slowly, as long as you can while avoiding flameout and eventually firing the rocket once you are as high and as fast as you can go. Keep in mind that a good jet can actually get in to an orbit (though air braking will cause it to not actually work). My best on a jet is an apoapsis of 250km and a periapsis of 40km with a speed of around 2300 m/s at the periapsis. We're talking only providing like .5kN of thrust with the jet engine in such thin atmosphere, but you can slowly work your way up, and just barely provide thrust that you eventually reach an equilibrium, but it's a hassle to fly like that. (Jet + Ion drives makes for a really easy orbiter with no oxidizer).
  7. This challenge appears hard at first glance, but it's surprising how easy it is to leave Kerbin orbit just with 1 jet and 1 small SRB. I didn't land anywhere, but even my first attempt put me intercepting with Duna's orbit without even trying. Of course, that's with only a sputnik probe on top, but the jets are so efficient, you could put a lot more up there and build up ~2km/s in atmosphere no problem, then have the SRB, then whatever you want to put on top.
  8. Sure, but that first stage has to be one SRB and only one SRB according to the challenger. As I understand it, that's means that your ship must be light enough that the lone SRB can lift it any amount. After that, anything is fair game.
  9. How in the world would one accomplish this? Hitting debris is *hard* to do on purpose, and if you "fragment Into at least 12 pieces" that suggests that you have imparted some relative velocity to those parts so they will just keep getting farther apart. *Please* read the guidelines and attempt your challenges first. You would have seen that this is unreasonable.
  10. This one actually has the smaller SRB burning with the 4 outer asparagus engines. So the process is as follows (it doesn't match the layout). 1. Light large SRB [lift-off] 2. Large SRB burns out 3. Dump large SRB, light small SRB *and* 4 outer engines (this is 2 stages technically, I need to restage the thing so it is one action by combining stage 5 and 6) 4. Small SRB burns out (before any side engines run out) 5. Dump small SRB and light inner engine 6.... Normal asparagus staging from here until the nuclear stage. I haven't really seen any designs do this, and am not sure how much (if any) it gains me over putting another liquid engine down there, but I wanted something that would empty before the first pair of side engines needed dumped. It is on the bleeding edge of what the first SRB can lift off though, right before it empties, so the only other option is another FLT-200 and a LV T-30 to still take off. I think the SRB makes more sense in that weight restriction. The small SRB is 250 kN for 30 seconds, and a tiny liquid pair would be 215kN for only ~16 seconds weighing less wet 1.375ish T but .875T more when dry. I don't see how that liquid would be better.
  11. k, here we go.... (should have put lights on it, woops) On the pad: "lift off" with 6 seconds of SRB burn left orbit at 72km, 2530 m/s delta v left 1670m/s delta v left after mun burn hello mun! landed woops, can't get home!
  12. I made one that can land on mun with about 385 m/s delta v left that doesn't do any jet or xenon trickery. Is it worth documenting with screenshots? It's nothing special. Just the SRB (which gets it about 1 or 2 m/s of speed before burning out), then a small SRB and a 4 engine asparagus stage with a 5th engine that joins in when the small SRB burns out. I don't really like the 70km apoapsis part of the thing because a 70km apoapsis is very difficult to pull off with the nuclear rocket (even via mech jeb) because of the lower TWR. I did a 90 when I did this one. Let me know if I should go back and document.
  13. Your design let me make my first survived touch down on the moon. I blew the lander up, but they did survive. I've never managed that before.
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