Delta-V to reach Moho orbit

[Red Iron Crown]

What mod gives those info displays next to your navball?

Vessel Orbital Information Display.

[Aethon]

- One burn exiting Kerbin SOI (must be 950m/s i think), no plan match, no orbit cross, just out of Kerbin SOI, backward kerbin move for inner planets, forward for outer

- Plan a manouevre at Dn or An, which permit to cross orbit, and match plan

- If u come too quick/slow, adapt ure speed when ure still in Kerbin SOI (on the still blue part of ure trajectory), and play wiz the An/Dn node for matching target, playing wiz these two spot permit too easily reach anything

Congrats. Having a ship that'll get to Moho means having a ship that'll work for almost anywhere.

Couple things I'll say. Leaving LKO on Mohos' AN/DN will save more dv. On or about Earth day 21, hour 17, Kerbin is already on Mohos' AN. This allows you to combine your inclination burn and your escape burn into one maneuver ( burn ). Here's an image of my Kerbin escape burn. Thanks to Improved Chase Cam. from my equatorial orbit you can see the down angle of my combined inclination/escape burn.

http://steamcommunity.com/sharedfiles/filedetails/?id=314517930

From map view. Inclination + escape

http://steamcommunity.com/sharedfiles/filedetails/?id=314532112

It's is more efficient and makes better use Kerbins' oberth effect to complete your transfer burn inside Kerbins' SOI, burning all the way down, so your solar periapse touches Moho's orbit ( which is also Moho's solar peri. ) If you just burn from LKO to solar orbit ( 1100/ms ) you're missing out on all the juicy oberth goodness.

http://steamcommunity.com/sharedfiles/filedetails/?id=314531932

Edited December 28, 2014 by Aethon

[merendel]

Last ship I designed for Moho had about 5200 dv between the transfer and deceleration stages. Left kerbin when it was at the AN/DN to get down to a moho crossing orbit and then a retrograde burn at solar PE to get a Moho intercept on the next orbit. Depending on which node I left at I'd either spend more leaving kerbin or more slowing down once at moho but they both had enough to achieve orbit with the same craft. Normaly ran out of fuel before geting compleatly low circular but got fairly close (10k by 100k or so) the lander/return stage had enough extra to finish the mission from there.

[TheNorthFace]

Your approach is almost correct, but it is optimal for a flyby, not capture. To get captured around Moho with the smallest amount of delta V you want to approach it at periapsis.

http://forum.kerbalspaceprogram.com/threads/61478-Oh-bugger-Injection-burn-at-Moho?p=835667#post835667

If you're really OCD about doing everything as efficiently as possible, like getting into a Kerbin orbit that will allow you to burn prograde into the correct ejection angle, you can probably save another 100 m/s or so.

Brilliant! I learned a lot from that answer you gave on the previous thread.

So it seems we've established that a very efficient Kerbin -> Moho orbit transfer should equal to about 4000dv. Any ideas on how much it takes for the trip back, and what would the proper techiniques be for that trip?

[PLAD]

A few months back Metaphor found a way to get from Kerbin's surface to Moho's surface for 7217m/s total. It's here. Since he used about 4400m/s to get to LKO from the surface, it was about 2850 from LKO to landed on Moho's surface. The trick was doing a flyby of Eve when Eve was in the plane of Moho's orbit- this means Eve both eliminates the plane-change expenditure and it lowers your transfer orbit apoapsis and thus arrival speed at Moho. He used some other hardcore tricks to lower the Moho capture to an astonishingly low value, but even without those you could do the whole surface-to-surface trip for under 8000m/s. Getting back could be done using Eve also, but I haven't seen anyone try that yet.

[juanml82]

A few months back Metaphor found a way to get from Kerbin's surface to Moho's surface for 7217m/s total. It's here. Since he used about 4400m/s to get to LKO from the surface, it was about 2850 from LKO to landed on Moho's surface. The trick was doing a flyby of Eve when Eve was in the plane of Moho's orbit- this means Eve both eliminates the plane-change expenditure and it lowers your transfer orbit apoapsis and thus arrival speed at Moho. He used some other hardcore tricks to lower the Moho capture to an astonishingly low value, but even without those you could do the whole surface-to-surface trip for under 8000m/s. Getting back could be done using Eve also, but I haven't seen anyone try that yet.

Maybe I'll try it...

because I got impatient with my Moho-Kerbin window and didn't have enough delta-v to reach Kerbin, so my Moho lander is returning to Eve instead of Kerbin. I'll see if I can get a gravity assist to Kerbin (My lander tanks are almost dry) or I'll stop there and refuel with the tankers I'm sending in my Kerbin-Eve flotilla

[merendel]

The trick was doing a flyby of Eve when Eve was in the plane of Moho's orbit

Ya Eve is amazing for gravity assists to cut down on dV requirements to prety much anywhere but duna. The downside is time. unfortunatly your looking at a year or two between launch windows to eve (kerbin years) and you can be waiting several windows for a convenient alignment for the AN/DN. I frequently dont have the patience to wait for that perfect slingshot alignment and just build a bigger ship. Takes less time to farm money for that than it does to wait for the launch window. Sunskimmers are about the only missions I regularly slingshot off eve and thats asumeing I dont use Jool instead (depends on if I'm aiming for low circular orbit or just wana zoom close.)