Delta-V for Eeloo return mission?

[A35K]

So I'm planning a manned return mission to Eeloo, but I have checked several d-v maps but they all seem to give different figures (even excluding atmospheric do for getting into orbit on Kerbin). So how much delta v is required from LKO to LEO (low Eeloo orbit) and back? Is 10kdv enough? (This does not include the lander's dv, so the 10k would only be used from LKO to LEO and back. Edited November 19, 2015 by A35K

[Snark]

My favorite tool is this one:
[url]http://ksp.olex.biz[/url]

I'll assume that you're starting in LKO, and also that when you return home you can aerobrake and land so that you don't need any dV upon Kerbin arrival.

Step 1: Find ejection dV to go to Eeloo. Use the tool, with Kerbin as origin and Eeloo as destination.

Step 2: Find orbital-capture dV to arrive at Eeloo. Use the tool in reverse: tell it that Eeloo's your origin and Kerbin is your destination.

Step 3: dV to go from Eeloo orbit to the surface. For a low orbit, this will be about 75% of Eeloo escape velocity, which you can get from the info panel of the map view. Best to add some safety margin to allow for suboptimal descent profile.

Step 4: Ascent from Eeloo surface to orbit. This is the same value as step 3.

Step 5: Head home to Kerbin. This is the same value as step 2.

So take s1 + s2 + s3 + s4 + s5, and then add some buffer to deal with making a plane change during your transfer orbit (can't be bothered to figure that our right now, but 1000 m/s should be ample if it's done right).

[A35K]

Thanks! That tool is really helpful, I used it before but for some reason didn't remember of it. So 10k dv should be more than enough...

[Racescort666]

If you are interested in a mod that helps, transfer window planner is pretty awesome:[URL="http://forum.kerbalspaceprogram.com/threads/93115-1-0-x-Transfer-Window-Planner-v1-3-1-0-(July-19"] http://forum.kerbalspaceprogram.com/threads/93115-1-0-x-Transfer-Window-Planner-v1-3-1-0-(July-19[/URL]

[juanml82]

[quote name='Snark']My favorite tool is this one:
[url]http://ksp.olex.biz[/url]

I'll assume that you're starting in LKO, and also that when you return home you can aerobrake and land so that you don't need any dV upon Kerbin arrival.

Step 1: Find ejection dV to go to Eeloo. Use the tool, with Kerbin as origin and Eeloo as destination.

Step 2: Find orbital-capture dV to arrive at Eeloo. Use the tool in reverse: tell it that Eeloo's your origin and Kerbin is your destination.

Step 3: dV to go from Eeloo orbit to the surface. For a low orbit, this will be about 75% of Eeloo escape velocity, which you can get from the info panel of the map view. Best to add some safety margin to allow for suboptimal descent profile.

Step 4: Ascent from Eeloo surface to orbit. This is the same value as step 3.

Step 5: Head home to Kerbin. This is the same value as step 2.

So take s1 + s2 + s3 + s4 + s5, and then add some buffer to deal with making a plane change during your transfer orbit (can't be bothered to figure that our right now, but 1000 m/s should be ample if it's done right).[/QUOTE]

I wouldn't bet too much on aerocapturing at Kerbin. It's doable, depending on the ship design. But I'd try to save some 1,000 dV for that part of the journey just in case aerocapturing doesn't work

[More Boosters]

[quote name='juanml82']I wouldn't bet too much on aerocapturing at Kerbin. It's doable, depending on the ship design. But I'd try to save some 1,000 dV for that part of the journey just in case aerocapturing doesn't work[/QUOTE]

Well if your setting lets you "see if aero capture works", you can always launch a secondary rocket to catch the poor guys.