Jool system delta V map?

[Captain Sierra]

I know there calculators and full kerbol system maps out there, but is there a good, accurate delta V map for the Jool moon system? ksp.olex.biz will give me the phase but not the ejection (It tells me NaN). Moreover, I want something to have on my desk. Anyone know of one out there?

[The Spacemonkey]

I searched it up on the internet, can't find anything.

[3_bit]

Let this thread serve as a proclamation: SOMEONE who is good at photoshop is needed to make a nice map for us all to see! It would probably get featured if it's nice enough.

[Captain Sierra]

Let this thread serve as a proclamation: SOMEONE who is good at photoshop is needed to make a nice map for us all to see! It would probably get featured if it's nice enough.

Yes please. I am semi-okay (by that I mean barely competent) with GIMP but I don't know the data.

[Superfluous J]

I never pay attention to the ejection angle. I just make my maneuver node with the correct Delta V and then drag the node around until my periapsis (for heading outward) or apoapsis (for heading inward) is near my starting body. Then I use that maneuver to make the burn.

[Moar Boosters]

The problem with making a Jool Delta V map is where is the starting point? It's not like you can measure from low Jool orbit, because setting yourself up in low jool orbit isn't an efficient way to transfer to the planets.

Technically the delta V required to intercept most of the planets is 0, as you can aerobrake into an intercept, but it's very hard to do perfectly and you're still going to use some delta V ajusting your periapsis to aerobrake at the right altitude. There is a nice guide made by alterbaron on aerobraking, so you can minimize the adjustments needed to get a decent intercept.

http://forum.kerbalspaceprogram.com/threads/30433-A-handy-chart-for-Aerocapture-at-Jool

[Specialist290]

I don't know about any Jool-specific delta-v maps, but alexmoon's Launch Window Planner does let you find the ideal launch windows for transit between Jool's moons, if that's what you're looking for.

[Captain Sierra]

The dV map is not for entry. The map is meant for once you are there. I have big plans but I'd like to be able to do better planning. Once I am in the system and bouncing around from my Lathe colony to my Pol kethane base and my Tylo orbital station, I need to know what kind of dV that will take.

[Superfluous J]

The problem is, that you can't make a "Jool Map" with any benefit. You need to make a "Laythe Map" and then a "Tylo Map" and then a "Vall Map."

This is for the same reason you can't use the "Kerbin Map" to get the DeltaV required to get from Duna to Eve.

[Specialist290]

The dV map is not for entry. The map is meant for once you are there. I have big plans but I'd like to be able to do better planning. Once I am in the system and bouncing around from my Lathe colony to my Pol kethane base and my Tylo orbital station, I need to know what kind of dV that will take.

I don't know about any Jool-specific delta-v maps, but alexmoon's Launch Window Planner does let you find the ideal launch windows for transit between Jool's moons, if that's what you're looking for.

Relevant words from my original post bolded for emphasis. I'm trying to tell you that alexmoon's calculator can plot the delta-v required to get from one moon to another and back, but perhaps I didn't word it clearly enough.

Edited October 10, 2013 by Specialist290

[Captain Sierra]

I KNOW. ksp.olex.biz will give that to me too. What I think would be good to have is all that data on a system map for operations within the jool system. Since it's so large, there's more than enough info for a full map.

[Specialist290]

Fair enough. I see what you're getting at now.

After playing around a bit with the calculator, I've noticed that the numbers for Laythe <-> Vall, Vall <-> Tylo, and Laythe <-> Tylo are more or less consistent, so I'll go ahead and post those here. Numbers are given by body, for leaving from one and capturing around the other:

Laythe 772 m/s <--> 344 m/s Vall (total: 1,117 m/s)

Laythe 826 m/s <--> 876 m/s Tylo (total: 1,703 m/s)

Vall 335 m/s <--> 843 m/s Tylo (total: 1,178 m/s)

Bop and Pol are going to take a bit of work, though, since their orbits are pretty significantly inclined.

[Captain Sierra]

Fair enough. I see what you're getting at now.

After playing around a bit with the calculator, I've noticed that the numbers for Laythe <-> Vall, Vall <-> Tylo, and Laythe <-> Tylo are more or less consistent, so I'll go ahead and post those here. Numbers are given by body, for leaving from one and capturing around the other:

Laythe 772 m/s <--> 344 m/s Vall (total: 1,117 m/s)

Laythe 826 m/s <--> 876 m/s Tylo (total: 1,703 m/s)

Vall 335 m/s <--> 843 m/s Tylo (total: 1,178 m/s)

Bop and Pol are going to take a bit of work, though, since their orbits are pretty significantly inclined.

Lots of testing will be in order. i think it's a safe bet that you'd be looking at 1500 one way minimum, especially for Bop. I'll do some experimentation with some NERVA probes to see. I might be using the tylo stations as pit stops for my outer moon deliveries.

[aeTIos]

If anyone gives me the data, I will make a map.

[Specialist290]

All the data you really need can be found from alexmoon's calculator. It's just that for Bop and Pol, since their orbits are inclined and eccentric, you'll have to run the calculator for several different launch windows per target body to get a decent average estimate.