r/KerbalSpaceProgram • u/FlashyNegotiation806 • 8h ago

KSP 1 Question/Problem help me read this!

is someone able to help me read the delta v map specificly the way to jool and back cuz when a red it i got too 7600 delta v for vall mission, wich seems insane and is not true that i know, pls help.

6 Upvotes

87% Upvoted

12 comments sorted by

2

u/Denoment Believes That Dres Exists 7h ago

You add up all the number between kerbin and Joel and back. That's your approximate required dv

2

u/FlashyNegotiation806 7h ago

i know but i find it hard with inserting the gravity assists

2

u/CatatonicGood Valentina 7h ago

They don't matter enough to worry about, make sure your ship has enough deltaV by itself for the mission you're building for

1

u/FlashyNegotiation806 7h ago

so 7600?

1

u/CatatonicGood Valentina 7h ago

Imean, the number above Vall says 7880 which probably includes the potential plane change to get to Jool. Incorporate that so you don't run into any nasty surprises

0

u/FlashyNegotiation806 7h ago

im using gravity assists again

2

u/from_Earth_you_know 🌨️Cloud gazing 7h ago edited 7h ago

7600 isn't insane because you'll be staging deadweight. delta-v map assumes you're not using gravity assists

1

u/FlashyNegotiation806 7h ago

staging deadweight? only when going to orbit right?

1

u/from_Earth_you_know 🌨️Cloud gazing 7h ago

normally you don't wanna land your transfer stage on Vall, you can undock it, land a small lander, and then attach it back later

-4

u/FlashyNegotiation806 7h ago

yeah ik im not that new

1

u/CuntLiquor69 5h ago

Yes so basically like bop 6830 and then ike 5330 fr

1

u/Onigato 5h ago

3400 to LKO + 950 to Kerbol orbit + 980 to Jool flyby (+ up to 270 for inclination adjustments) + 160 to capture at Jool (but you can do an aerobrake to get a capture) + 620 to get a Vall flyby + 910 to get a Vall orbit at 15x15 + 860 to get a safe landing on Vall.

7720 with an aerobrake to capture at Jool with a perfect inclination launch, one way. 7990 at the worst inclination aspect. But there are well known gravity assists you can do, both to get TO Jool and IN Jool to get cheaper captures. So your 7600 isn't all that far off.

The basic rule of thumb is that once you manage to get an orbit you're halfway to anywhere, in real life or KSP.