Eddy119

Thanks for this guys... I forgot about this thread

I just made a separate post for this question but I'm wondering if it's possible for someone to find a semi regular list of launch windows for the KEKKJ/KEEKJ/other gravity assist ways to go to Jool under 1200m/s? Can't get the online finders to give me proper trajectories...

Hi, I am wondering if someone can make a list of KEKKJ/KEEKJ gravity assist launch windows (other than year 2 day 160) to Jool. I can't get the gravity assist calculators (like KSPTOT or https://kerbal-transfer-illustrator.netlify.app/Flyby) to work (or please tell me ways to calculate this). I want to know if it is possible to do this at a regular (ish) interval in time. I guess any multi flyby that is <1200m/s is also nice. I've been wondering about this for years... I think in general Jool has to be opposite to Kerbin at launch (or you miss Jool even if you can get it to intersect Jool orbit) but I'm not sure about the specifics? Thanks...

If you match the inclination at launch you save even more delta v. Here is Year 2 Day 218 for 2393m/s. (I just tried to do the year 2 window and I ended up using 3600m/s probably because I screwed up.)

Hi, @theAstrogoth's tool works well for low Moho orbital insertion from low Kerbin orbit via 2 Eve gravity assists, with an average of 3200m/s for each year. I have calculated every year up to year 21 for a Kerbin-Eve-Eve-Moho route. This can be done by inputting 71000 for Kerbin orbit, 10000 for Moho orbit, adding 1 Deep Space Maneuver for the Eve-Eve leg, and unchecking the no insertion burn box at mission settings. Basically, you do an Eve transfer for ~1500m/s a bit later than when you're supposed to when doing a normal Eve transfer. You want to meet Eve when it is at the ascending/descending node of Moho orbit (which coincidentally happens to be Moho's aphelion/perihelion) so you can tilt your orbit to match Moho's inclination. You want to also meet Eve at the same place 1 Eve orbit/year later. Then the next time you meet Eve you reduce your perihelion to meet Moho near its perihelion. Year 2 Day 222 2707m/s Year 13 Day 192 2597m/s All of each year's windows up till year 21: https://docs.google.com/document/d/1gQ5Rqj28xz9VmWYp02KwDkiTwwKr8COoaGOh8hgsh7M/edit?usp=sharing Combined with self-gravity assists of Moho, (aka vinf leveraging maneuver) by intersecting Moho's orbit at its tangent (perihelion) bending radial in/out for your orbit to intersect Moho's orbit and at aphelion of your orbit burning prograde to meet Moho's orbit at its tangent (perihelion) after a few Moho orbits again, you can save even more fuel. This is what MESSENGER did and BepiColombo is doing now. Here is the source of that: https://forum.kerbalspaceprogram.com/index.php?/topic/208730-messenger-style-mission-to-moho/#comment-4150697 I want to make something like this for KEKKJ Kerbin-Eve-K-K-Jool but I can't make it work. I also added a graph of the delta v required (not including Moho self assists) for each year and 3 windows that only require 1 eve assist on year 7 day 175 year 10 day 202 year 18 day 197 etc... that only takes 3000m/s (2600m/s for year 18) in the Google Doc. Edit: Average mission duration of Ke-Ev-Ev-Mo is 1 year 200 days Edit 2: Oh, and also you probably even more (a lot of? idk) delta v if you burn to an inclined orbit instead of equatorial. A significant amount of the departure burn involves radial burn.

Hi, I'm wondering if it's possible/if there's a difference between this and launching inwards closer to the sun for a 3:2 orbit (3 probe orbits every 2 Kerbin years) against Kerbin? I don't know how to calculate it...

Just leaving another thing here, self-flybys are called vinf leveraging manuevers. Examples are using Moho flybys to get nearer to Moho's orbital speed or using Kerbin-Kerbin flyby to Jool (Juno style). There are a couple of papers that describe it but not in an informal Kerbal way. I'm not sure how conservation of energy works in this aspect... https://engineering.purdue.edu/people/james.m.longuski.1/JournalArticles/1997/V_infinityLeveragingforInterplantaryMissions_Multiple-RevolutionOrbitTechniques.pdf https://dataverse.jpl.nasa.gov/api/access/datafile/36027?gbrecs=true

Maybe one way is to use Eve as the last flyby before Jool... I got 1500m/s for KEEJ or KEEEJ... not sure how to make it <1100m/s for ~6 years though...

Hi, I don't really know where to ask this so I'll ask here. So KEKKJ works when Jool is on the left side of kerbin (across the sun, near conjunction) at launch in general. If it's near opposition (on kerbin's side) then it seems like we need some other way to do it if not waiting years for Jool to be on the right side again... Anybody have any flybys that take a similar amount of fuel and time to get to Jool in these cases? Anyway it seems like the calculator can calculate Ke-Eve-Eve-Moho reasonably at about 4000m/s of delta v including circularization... Although some direct transfers also take about that much fuel (depending on if Moho is near periapsis)

Do I leave the box checked for normal purposes? (Sorry for another question)

So does it mean if I uncheck it there is no departure burn from Kerbin?

Hi, what does departure excess hyp. velocity mean in Flyby finder? I'm so confused by it...

theAstrogoth's tool gives me 1700m/s. Ugh.

That sounds pretty good (for me). Can you tell me your input? Thanks

Video above shows 1100m/s I think the Ke-Ev-Ev-Mo works well though? (Similar to KSPTOT) I'm not sure what departure vinf is on KSPTOT is though... Yours is easier to read overall

I think it's supposed to take less than 1100m/s depending on the time (year 2-3)... I'll elaborate later after my exams

Hi, it seems like Ke-Ev-Ke-Ke-Jo (KEKKJ) doesn't work too well on your website?

Heh, I'm enjoying real solar system with this mod... Tried to recreate mariner 10 gravity assist to Mercury (and failed today)... What's the rescaled diameter of the 0.625,1.25,1.875,2.5,3.75,5m tanks?

quick question: which module causes kerbals to have to rest before another mission and how do i disable it? I found retirement in the difficulty but there isn't a setting for inactive/recovering/rest/what do you call it

Hi, the FASA Apollo CSM engine doesn't recognize the CSM as being pressurized despite it being a pressurized part. I also just posted it on GitHub (edit: the RO GitHub)... Sorry it's getting on my nerves and I'm too busy to figure it out on my own... Thanks...

Update: it bugs out when I load an existing file, new builds are fine

Sorry, I was busy... here's a list of my mods, I'll send screenshots later...

Is it just me or do the parts (FASA, even some stock parts) attachment nodes overlap at the wrong place? Anyway, I realized that I can turn off engine ignition limitations off in the RealFuels config (which is why I came here in the first place) so I'll try to do that... @.@

heh, the camera is (still looks like) the science jr

Where did the seismometer (accelerometer?) go? How do I disable part replacements? And enable alarm clock support? update: heh, the camera is (still looks like) the science jr