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Found 22 results

  1. I made a series of illustrated tutorials for orbital rendezvous & docking. There are 4 techniques. For a link to all the images in a single imgur album, click here. Hohmann Transfer Rendezvous: Orbit Phasing Rendezvous (easy radial-burn version): Orbit Phasing Rendezvous (more efficient prograde-burn version): Parallel Orbit Rendezvous: Changes: v7 - Adjusted phrasing in one chart and updated drawing of spacecraft in all 4 charts. v6 - Fixed a typo in the Hohmann transfer's step 6. v5 - Added 2 techniques (for a total of 4). v4 - Spelling error corrected. v3 - Refined instructions for final approach, docking indicators now also includes Navball Docking Alignment Indicator, more notes on how to be efficient. v2 - Split into 2 versions: efficient & easy. v1 - Original version.
  2. Hi, I'm trying to complete the "Explore Kerbin" mission, where I need to rendezvous two vessels close to each other and remove all relative velocity. I did that, so I don't know why the mission doesn't complete. What am I doing wrong? Thank you in advance. Screenshot
  3. OK so i have been looking for a way to mathematically figure out how to rendezvous with anther spacecraft with out using the map as a challenge and i have been reading on Wikipedia on orbital rendezvous, and i think i have come to an partial understanding of it but i am not sure. so here is what i know that i have to do. first i have to go either higher or lower than the target, phasing orbits, and then at a certain moment i have to speed up to catch up with the target when in a matching intersection, and then after the burn i have to point retrograde on target mode on navball and fire at closest approach when i get to the separation distance. now here is the article that i have been reading and i partially understand it except for the ARC-TAN, SINE, TAN. so its just the arc tan, sine and tan that get me off cause i have no idea what they are
  4. If I launch a single rocket with a command module and lander into orbit of the Mun, let's say, I know that if I immediately decouple the vessels and then dock them together, it won't fulfill the contract because it came from the same launch. But when I land the lander on the surface and then meet up with the command module again in orbit the second time, will that satisfy the contract? I'd like to not have to build additional rockets just for the purpose of the docking and see if I can knock it out instead during another contract mission. Thanks!
  5. In honor of love lost Place (or have) a space station in orbit of Kerbin in range of 100x100 to 120x130 with at least two docking ports Place a female kerbal in the space station. The method of doing so is expected to use up one of the docking ports. Send as a male kerbal to to the space station at high speed. In particular: * Have a TWR of at least 2.5 on the pad. * Get shock heating during ascent * Get a space station intercept within 2.5km while still suborbital (PE below 70km); use the velocity matching burn also as your orbital insertion burn * Dock with the space station within one orbit after launch. Hard mode: * Intercept space station with PE still below the ground * Exceed 5 TWR at some point during flight. * Dock within half an orbit * Do not rotate the space station Insane mode: Do it in RSS (adjust space station height to something reasonable) I have done easy mode entirely by accident in my career save, and hard mode on purpose. My entry (hard mode): I got to intercept and matching velocities within 6 minute of launch. I managed to fail to record the time to dock, but from this point it was without time acceleration and couldn't have been more than 5 more minutes. Balanced mods welcome. If you really want to keep score, probably the best way in keeping with the spirit of the challenge is minimum time to dock. Yeah that leads to radical risky docking maneuvers but that's the Kerbal Way.
  6. Okay, I have a weird problem, but one that is very annoying. When I try to do a rendezvous I get an encounter, usually <1 km, but when I go out of map mode and look around for it I can't see it, it usually tells me the distance between our ships, but it didn't, I used the navball to point at it, and lined my camera up with it I couldn't see it, I tried getting closer the retrograde vector to slow down then burning towards it, so I got my encounter down to .1 km, but when I finally was able to see it it still wouldn't show me the distance. I only have MechJeb installed, so I tried uninstalling it but it still wouldn't work. It worked up until I installed MechJeb. I'm worried that it overwrote some file that gives me the distance, but I don't want to reinstall it and lose all my saves, although I could just copy the save file, but that might be the corrupted part. I haven't been able to do any rendezvous and dock. Please Help.
  7. So, I managed to get a Kerbal stranded in a nasty orbit. I burned out of a moon mission with bingo fuel and chose too high a periapse; it was just within Kerbin's atmosphere but it was high enough that after a few successive orbits my apoapse was still inside the Mun's SOI. I was warping aggressively and ended up accidentally getting a Munar slingshot that put me in a highly inclined, highly eccentric orbit without enough monopropellant or bipropellant to get back to an aerobraking trajectory. Worst of all, it was a powered lander, so I didn't even have a chute to use even if I'd been able to EVA-push the ship into an aerobraking trajectory. Of course, I could have just terminated the vessel, but I didn't really want to. So I needed a rescue mission. At this point, I'd never done even a single orbital rendezvous (not with another spacecraft, that is), let alone a highly inclined, highly eccentric orbit with a dead target. This was tricky. I couldn't really find any specific set of instructions, so I figured it out as I went along, and figured that someone else might also be interested in them. Step 0: dV for days You're going to need a lot of fuel to pull this off, so for the love of Kraken use a large launch vehicle with a hefty amount of bipropellant for orbital maneuvers. There are ways of doing this that are slightly more efficient, but they aren't nearly as straightforward, so just plan for extra Step 1: Match inclination It's really dV-costly to change inclination once you're already in orbit, so wait until KSC passes directly under the orbital path of your target and then launch either North or South, depending on the angle of your target. Go to map view and set your target as target so that you know the inclination of the descending and ascending nodes, and vary your launch direction in order to keep this value to a minimum. Once you're in orbit, use a normal or antinormal burn at the ascending or descending node to zero out inclination difference. Step 3: Circular intercept To have any chance of intercepting your target, you need to be in a circular orbit that touches the orbit of your target. The most efficient way to do this is to touch the orbit at your target's nearest approach to Kerbin, its periapse. So write down that altitude, then burn prograde to raise your apoapse to that altitude. At your apoapse, burn prograde again to circularize to exactly that altitude, so you end up with something like this: Technically, it is more efficient if you are in an eccentric orbit where your apoapse matches the periapse of your target, but this is more difficult to achieve and makes your timing a lot less forgiving. Step 4: Timing the Rendezvous This is the part that confused me, and it took me forever to figure it out. It does no good to match the orbit of your target before the rendezvous. Don't do it. Instead, set up a rendezvous as close as possible to the periapse of your target. Here's the magic. When you are next at the interception point, your target will still be some distance away, with a certain time (2 hours, for example) separating it from that point. You need to burn at that interception point until the total period of your new orbit exactly matches the time separating the target vessel from your current location. This will ensure that you complete your new orbit just in time to meet up with your target at its periapse. Voila! Thankfully, this isn't the 1970s, so you don't have to calculate these periods using Kepler's Laws. You can simply place a maneuvering node at the interception point and drag it prograde until the "closest approach" markers line up at the interception point. Make this as precise a match as possible, then go ahead and do your burn when you reach the node. It's a good idea to burn about 90% of the maneuvering node and then delete it and complete the burn manually, since your screen will be less cluttered and you can see the closest approach markers more clearly. You should aim to be within a few kilometers of your target. Step 5: Catching up Once you reach your rendezvous point, switch to targeting mode on your navball, point retrograde (which, in this case, is a relative retrograde), and burn to reduce relative velocity to zero at your nearest approach to your target. You want to be lined up along a radial vector with as little prograde-direction misalignment as possible. You'll probably want to split this into a few burns. Once you've zeroed out relative velocity, you can proceed to approach and dock (or EVA, or whatever) normally; there are plenty of good tutorials for that.
  8. I want to do an Apollo-style mission, with one difference: the Lunar Module launches first, unmanned, and enters Munar orbit. Then, the Command Module launches and docks with the Lunar Module in Munar orbit. The astronauts transfer to the Lunar Module and proceed as in Apollo, with the LM being used for descent and ascent and then being discarded. My question is this: where should the two spacecraft rendezvous for greatest overall efficiency? Should they aim for a high orbit or a low one? A low orbit takes advantage of the Oberth effect, but a higher orbit means it will be easier for the Command Module to return. If such a mission was carried out in real life, would it be better to use a place like L1 or L2 for the rendezvous?
  9. Hey guys, so I am looking for some tips on how to efficiently rendezvous with asteroids in interplanetary space, as I've heard that it would be more fuel efficient in the end, when dealing with bigger asteroids (starting of with C-Class and then going bigger). I want it to be fuel efficient too, as I am planning on mining them in my career mode. Rendezvous with them, when they are in Kerbin's sphere of influence, I've got pretty much nailed down, as all that need is some "basic" rendezvous. I did do a few quick searches, but they didn't help me out much, so sorry if there if there is a topic with it (link then maybe?) All tips help, as it is always good to refresh some old knowledge too (been playing it for almost 4 years I think)
  10. Until 1.2 whenever I was piloting anything in the regular view (not map mode), I could see a green box indicating anything within several km long before I could actually see the vessel. This box also included a little bit of text telling you your distance from this nearby object. Not sure how far away it would start to pick stuff up, but it was significant, at least 10-20km. Since I installed 1.2, I never see the little green target box indicator at any distance. This makes rendezvous in orbit a lot more difficult for me, since I usually guide myself to the encounter for about the last km with at least a little help from visuals. In orbit, however, especially in the dark, you can't see anything small (say just a basic capsule on a rescue-from-lko mission) until you're something like 25m from it. So you have this impossible task of flipping back and forth between map mode to check distances and back to the piloting screen so you can control the craft. I've been looking for a setting somewhere that turns this off and on but haven't found anything. So then I wondered if it might have something to do with the new com stuff? or maybe it has to do with something in career mode that I haven't upgraded/researched yet? Anyone else had this problem?
  11. Hello I am having some real problems with doing this "rescue contract" I got. I have to save Irra Kerman from Low Kerbin orbit, and bring him/her back. I launched my vessel, and adjusted the orbit so it's the same as Irra's, but... There's always a 1,750KM difference (a lot), and for every turn it changes half a kilometer or so (I have limited Electric charge). I know there are a LOT of tutorials in rendezvousing (I think thats how you say it?) but No one seems to help me fix this problem, either that or im doing it wrong. Every time I change my orbit I fall into Kerbin, or it just doesn't change at all We have the EXACT SAME orbit, just different locations. Any help? The tutorials didn't help me at all That's the only reason im bothering with this newbie question in the first place (Sorry) Thanks, DONUTS
  12. So I've launched my first-for-this-career (second-ever) space station. I have a contract to park it over Minmus and I would like it to live there anyway because I want to use it as a refueling stop for interplanetary journeys. (I figure I'll rectify the orbit's angle prior to departure.) The station has very low TWR because it's not intended to move around much. Even with an inter-orbital tug attached it'll still need perikicking to make it to minmus. My usual method won't work here. Usually I click on the orbit, add some prograde burn, wait for the conics to go all screwy, make minor tweaks until I like my arrival characteristics, time warp to maneuver node, make the burn. The problem is, by the time I'm done orbiting a couple of times, Minmus will have gone along on its merry way. Is there a guide to knowing where in a circular parking orbit you need to begin kicking for a Kerbin->Minmus transfer? I can time it for an AN/DN intercept if that helps, or I can match alignments in my parking orbit first.
  13. I would like to put a ship into orbit around minmus with a minimum of fussing around. I've heard that a 'direct launch' is the lowest dV way to get where you're going. Basically, skip the parking orbit and just go for what you want. Okay. Fair enough. What I want is a rendezvous orbit around Minmus with this here tanker, so that it can refuel an on-station lander. This means that in addition to burning directly into my minmus rendezvous, I also want to have inclination. I'm assuming, since I have zero control over where the KSC is that flying directly into the minmus encounter's no good. But how do I know which way to point my navball to get the properly 6-degrees-inclined orbit after I circularize into LKO? (I'm aiming for an 80km parking orbit to go for my rendezvous burn from.)
  14. So here I am taking a new ship for a spin. I try a targeted launch with MechJeb, it takes me within 2.7 km of an old 1.1.2 station that hasn't been given me crap yet; map says closest approach at 1.4 km. I timewarp to the sunlit side, and halfway through to the closest approach, I spot the station at 870 m. I dump the rest of the launcher, and fire up the Rendezvous Autopilot. The approach burn is executed flawlessly, but the final relative velocity kill burn doesn't happen; I try again, same thing. As I find out after turning the autopilot off, the controls, including throttle, RCS and orientation, freeze up within about 300 m of the station, and then upon reaching a certain distance. I took a look at the debug console, and there's a ton of errors. Possibly related to Log:!AmlSZuL0ax7C0BW8DlfPVp5D2WuB Mod list courtesy of AVC:
  15. So imagine two spacecraft orbiting kerbin have the same periapsis at the exact same point. One of the craft has a circular orbit. The second craft has an elliptical one. Is there a way to calculate the change in angle between the two crafts relative positions at each passing using only the second crafts apoapsis in contrast to the first crafts(since their periapsis are the same)??
  16. Somehow, I can no longer see the position and range cue for my rendezvous target, even at close range. I have still been able to rendezvous by using the nav ball cues and the range tip in orbit view, but it is a little clumsy to go back and forth between the two views. I used to have the cue at ranges less than about 25k, and I don't know what happened to make it go away. I am using (Mac), with Kerbal Engineer, Precise Node, and Alarm Clock. My tracking station and launch pad are fully upgraded, and VAB and R&D are at Level 2. I'd like to get the rendezvous aiming cue back.
  17. How-to: Docking and Rendezvous

    The basics of getting those two annoying ships together, painlessly.
  18. So I've been trying to tackle docking recently, and I'm starting to get the hang of it, but I thought of a question that interests me. At some point, you obviously have to be going at a different velocity than the ship you're trying to dock with. But this difference in speed would cause the trajectory, and therefore the orbit, of your ship to be slightly different than that of the ship you're trying to dock with. But it seems to still work nevertheless. So what's going on?
  19. Hello! Following tutorials and YouTube videos, I have succeeded in managing a number of rendezvous in orbit. (Yay!) I have watched my targeted item come into view and go out of view, and have approached withing a few meters. However, in all of these tutorials and videos that I see, the targeted object (in Staging) shows a yellow readout of its name and its distance. For example, see here at the time-tick 04:54 in this Scott Manley tutorial: But the objects that I target, and with which I rendezvous, do not show this yellow display! To check my distance while approaching, I keep having to switch to Orbit Map and mouse over the targeted object. I have indeed set the object as a target ("Set Target"). Any ideas? I am using version 1.x on Mac (Yosemite). Let me know if I can add any information. Thanks very much! Brooke
  20. Tips for Rendezvous?

    I'm a beginner at KSP (<100 hours) and I've only ever done rendezvous once, and that is with rescuing another kerbal (personally I think I just got lucky.) Now I have to learn how to dock. I've watched videos on it, specifically Scott Manley, but I just can't manage the skill to get the inclination right, nor get the spaceship in the exact same position as the target vessel. Any tips on how to make rendezvous easier? No mods please (except maybe those that don't affect gameplay). Thanks guys
  21. I'm doing a rescue mission without patched conics. I got my rescue ship within about 19 km of the stranded Kerbal, but I still couldn't target the stranded ship, even though I could see its pink "target" crosshair in the main map. How close do I have to get to target it so that I can enter target mode and complete the orbital rendez-vous? To be clear, I'm not asking for a tutorial on how to do an orbital rendez-vous; I've done countless rescues and docking operations in the past. But I've always had the benefit of patched conics, and this time I don't, so I can't click on the target or its orbit and enter target mode. (That is, the mode with the target in pink on the navball.) Thanks in advance.
  22. Yes I know, I probably spent Sateillite wrong in this post but we shall move on. I just wonder how you guys do it? How do you get a space station to fit together, what's its purpose, how do you dock ships and get them on the same orbit and all that? Seriously getting frustrated. is it even possible without mods?