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Is 2300m/s delta-v enough to get back from Vall to kerbin?


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On 9/1/2024 at 11:46 AM, Joshua0514 said:

https://imgur.com/a/WiDrCfC

Still can't post photo's for some reason.

Landed on Vall, not sure if i can get back. I do have the funds to build a rescue mission if needed, the orginal plan is to areobrake at Kerbin by the heatshield.

2300 m/s on vall surface, or on vall orbit?

in both cases, the answer is yes. if you are already in vall orbit, it should be easy enough. if you are on the surface, you may need a gravity assist from tylo.
in fact, using gravity assists, you should be able to return to kerbin with no more than 500 m/s from vall orbit.

On 9/1/2024 at 3:30 PM, modus said:

You can always check a delta V map, like the one here:

 

2300 is pretty tight:)

the deltaV map has its perks, but to move between the moons of jool, it's completely useless. it tells you how much you'd need to reach the moon from a low circular orbit around jool... why would you want to enter a low circular orbit around jool in the first place? that's an awfully inefficient way to get to a moon.

also, this should not go in mission reports, but in questions

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4 hours ago, king of nowhere said:

2300 m/s on vall surface, or on vall orbit?

in both cases, the answer is yes. if you are already in vall orbit, it should be easy enough. if you are on the surface, you may need a gravity assist from tylo.
in fact, using gravity assists, you should be able to return to kerbin with no more than 500 m/s from vall orbit.

the deltaV map has its perks, but to move between the moons of jool, it's completely useless. it tells you how much you'd need to reach the moon from a low circular orbit around jool... why would you want to enter a low circular orbit around jool in the first place? that's an awfully inefficient way to get to a moon.

also, this should not go in mission reports, but in questions

They said landed ;)

But you're right, I didn't take gravity assists into account.

Big fan of your missions, btw :cool:

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On 9/3/2024 at 9:11 PM, king of nowhere said:

2300 m/s on vall surface, or on vall orbit?

in both cases, the answer is yes. if you are already in vall orbit, it should be easy enough. if you are on the surface, you may need a gravity assist from tylo.
in fact, using gravity assists, you should be able to return to kerbin with no more than 500 m/s from vall orbit.

the deltaV map has its perks, but to move between the moons of jool, it's completely useless. it tells you how much you'd need to reach the moon from a low circular orbit around jool... why would you want to enter a low circular orbit around jool in the first place? that's an awfully inefficient way to get to a moon.

also, this should not go in mission reports, but in questions

i some how didn't do any gravity assist even only with 2300m/s dv on surface lol,forgot to bring parachute tho XD

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3 hours ago, Joshua0514 said:

i some how didn't do any gravity assist even only with 2300m/s dv on surface lol,forgot to bring parachute tho XD

makes sense, if you can aerobrake on kerbin. i kinda forget that most people just return from jool in a reentry pod, without trying to keep a functioning mothership.

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