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Found 12 results

  1. I'm trying to plan a mission to Moho. While I have MechJeb's Delta-V gauge to tell me if I can or cannot fly directly to Moho - fleet construction and organization is another problem - it does not tell me if I have enough Delta-V to do an Eve Gravity Assist to Moho. Here's the story. While planning transfer orbits for my Eve Fleet two months ago, I saw that the planned maneuver would have taken me in an escape trajectory out of Eve and into a somewhat low circular orbit around Kerbol - I forgot the specifics of the orbit, but it would have enabled me to put the crafts in some designated path for a contract. Now it got me thinking "Hey, maybe I can do that for a trip to Moho." If that's the case, here's my plan for a Eve gravity assist to Moho: Wait until the next Kerbin->Eve transfer window to escape Kerbin's sphere of influence (I have Kerbal Alarm Clock) As soon as I reach Eve's SOI, set my periapsis to 100-125 km and (possibly, it's been months since I was last at Eve) get in an escape trajectory out of Eve. Low periapsis requires less delta-V. Anything lower than 90 km will be dangerous (atmospheric burn-up, aerobraking messing up my escape trajectory, etc.) After leaving Eve's SOI (and in solar orbit), set up a Hohmann Transfer to Moho. On one hand, I get to do a really cool physics-based maneuver and (possibly) save delta-V (I don't say "fuel" since it's not the only factor used in MechJeb's Delta-V gauge) on my way to Moho. On the other hand, here are some numbers that may convince me that flying directly to Moho is just as good as using an Eve gravity assist. DIRECT FLIGHT LKO to Moho's Surface = 5490 m/s LKO to Low Moho Orbit = 4530 m/s EVE GRAVITY ASSIST TO SURFACE LKO to Eve Intercept = 1140 m/s Eve Intercept to Moho's Surface = 4350 m/s 1140+4350 = 5490 m/s TO LOW MOHO ORBIT LKO to Eve Intercept = 1140 m/s Eve Intercept to Low Moho Orbit = 3390 m/s 1140+3390 = 4530 m/s NO DIFFERENCE, IS THERE What do you think I should do to save Delta-V? Should I just stick with direct flights to Moho, or do you recommend I use the Eve Gravity Assist? If the direct flight is the best bet, fine. If the Eve assist is the best bet, then: How do I time it right to have the most efficient flight? Remember: I have Kerbal Alarm Clock. Any instructions for such a flight, or does my plan sound solid? Either way, off to the drawing board (I mean V.A.B.) for me. Your input is greatly appreciated. Thank you.
  2. So I am trying to get to duna with as little delta v usage as possible. Is there an efficiënt and doable way to use gravity assists to get to duna? I know of the oberth effect (sorry if I misspelled it). I just need to know how i can do an efficiënt gravity assist to duna. thx Edit: thanks for the comments so far. But to clarify, I do not want to refuel. An idea: would it in theory be possible to get myself in a 10% slower orbit than kerbin and then use a kerbin gravity assist. And would this even be feasable .
  3. Hello! I’ve been playing KSP for a while now and have become quite confident in my abilities. Although, I’m still having trouble with gravity assists. Is there an equation of some sort that I can use to calculate my speed after the slingshot/brake? Ex. Before assist craft is going x m/s, after the assist the craft is going y m/s I also would like to know if there is an equation I can use that will tell me the orbital velocity at a certain altitude above a body. Ex. At h meters with d degrees of inclination, the craft must be going x m/s to maintain a circular orbit If you have any other useful equations that would be nice, thanks!
  4. or does i can do this with mechjeb? How i can use Duna to reach Jool?
  5. I'm planing a manned Jool mission for my career save. The focus will be on extracting as much sweet, sweet science as possible from the Jool system before returning home to Kerbin. I'm going to use a NERV powered main mothership with 3 daughter landers to cover all the moons. (The Tylo lander will be an unmanned one-way trip!) Since this will be my first visit to Jool, I'm not sure what to expect for dV requirements after I capture into the Jool SOI. For a conservative estimate, I could simply add up all the numbers from the KSP delta-V map to get intercepts with each moon including the plane change amounts. This assumes (1) that the parent body will be Jool every time (2) no gravity assists from the other moons and (3) no daughter vehicles. With this in mind, do people have a ballpark number for the delta-v requirements to encounter all Joolian moons? I'm looking for rough estimates as a gut-check for my planning purposes, preferably from those who have done similar missions. I should also mention that I'm not planning to do any resource extraction, but I might need to if the dV requirements are too high.
  6. So I was watching this car jump from Minmus and noticed that a pass in front of the Mun tightened the resulting orbit considerably. Then I send my Iktomi explorer to Duna, and managed to pass in front of Ike, or rather, I crossed Ike's orbit just ahead of it. The insertion resulted in a wildly elliptical orbit, but it only cost me about 280 m/s. Then I take a look at what I can do out at the new apoapsis, and found that passing in front of Ike again would tighten the resulting orbit a lot, with the new apoapsis matching Ike's altitude, and only for a cost of 5 to 10 m/s. I imagine I could then tighten the orbit further for only a few m/s more at Duna periapsis, but didn't get a chance to investigate that yet. I want to understand what I'm seeing. I've read about and watched a lot of gravity assist examples on YouTube, but that car jump video had a very clear and beneficial example that I was then able to replicate. I remember that the assists are really directional changes at the body you're doing the assist at, but the new direction would instead represent some delta-v difference relevant to the parent body. But I'm wondering if a comparably simple rule would help me, something like, "pass ahead of a moon to slow down, pass behind it to speed up." At least in the two dimensions the typical orbital plane is in. --
  7. as the title says, it would be really nice if we could have a helper with gravity assists, like KER (is that going to be updated for 1.2? if ever?) but for gravity assists, so you could do gravity assists and missions like voyager, so you didn't have to have that much Delta-V on your rocket, so you can have more for the mission and moving around to adjust your orbit so you could make a mission like Cassini, resulting in more science, and more places you said you went to
  8. With the current excitement around the Juno mission approaching Jupiter after its earth-gravity-assist journey there'll be a lot of people playing around in KSP with similar goals. One thing that always holds me back in my interplanetary craft design is an efficient transfer as I always feel it is something akin to blind luck whether a planned assist will actually be useful or not since it is very difficult to set-up with options we have. Before launch we can use an orbital satellite say to set-up a practice node, and we can even edit the set-up files to show a couple more SOI changes in the patched conics but how do we set-up an encounter with Kerbin from within the Kerbin SOI? For reference this is the Juno gravity assist & an awesome video filmed from Juno of the earth fly-by Two years after launching and heading out beyond the orbit of Mars Juno returns to encounter earth again giving it the extra Kinetic Energy required to reach Jupiter. I know that there are a lot of complexities in achieving this, and KSP is just a game after-all, but so much has already been achieved with the 'Map' screen in making previously impossible concepts easily visualized and achievable that I wonder if there is some way I don't know. I've seen some videos of people setting up elaborate gravity assists that take 10's of years and minimal burns using precise node and Mechjeb ... but what can we do in stock (or near-stock)? Are there any tricks I don't know about? Improbable 34 stage wobbling skyscraper rockets screaming their way obnoxiously through atmosphere are fun and all ... but a trim efficient design can be much more satisfying.
  9. Hi everyone. This isn't a first for me. I tend to sling mission together with little regard for tolerances, especially when I am headed somewhere for the first time. So my situation is this: Orbiting Dres (first time visiting Dres yay!) with about 1067m/s Delta V left in the tanks and a requirement to Kerbin from Dres of around 1.3 km/s. I'm a little short as they say! The mission has gone perfectly up to now with a successful landing, and planned canyon skydive being completed, as well as a rove. I don't really want to get out and push as while possible, I did that the first time I went to Moho and want to try something different. I'm thinking Gravity assist would be the best way. I can get to Jool for around 700m/s by the looks of it so what do I do from there? Do I swing round Tylo (I've heard you can get a free ride home from there under the right circumstances) or has someone got a better solution to get me home within the 1km/s budget? Answers muchly muchly appreciated - I've never really got into Gravity assists so I'm a little out of my depth! EDIT: @Zhetaan wow that's some superb information there so thanks for pretty much dropping an education on my sorry mission to Dres! I will explore this in depth this weekend and report back for you. @PLAD thanks also for your input SM
  10. Hello! I'm trying to get a gravity assist to get into Jool orbit. I've never done this before, and I'd be happy to hear any tips! Here's what it looks like: These are my primary questions: How can I see whether I will be in orbit after I've exited Tylo's SOI, before I've entered it? How can I figure out where I need to enter Tylo's SOI, and at what angle, to be captured into orbit? I can easily provide more info if it's needed. Thanks a lot!
  11. Interplanet Janet

    DEAD THREAD

    PLEASE DELETE
  12. The challenge: Once in low-Kerbin orbit and you've matched planes with Minmus, position a maneuver-node to allow you, with only one burn, to put your spacecraft on a free-return trajectory around minmus, BUT! also get an encounter with the Mün between escaping from Minmus and Kerbin periapsis. Bonus points if you can have the Mün encounter slingshot you in a way that allows even more gravitational assist maneuvers. Basically, start in low Kerbin orbit matched with Minmus' orbital plane. From that plane-matched low-Kerbin orbit, perform ONE engine-burn with as many gravitational encounters/escapes as possible without any extra engine-burns.