berkekrkn

Is there a delta V chart for real solar system mod ?

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I have one:

WGOy3qT.png

It is not actually for KSP RSS but for the actual real solar system, but the delta-V is meant to be the same :P

It is very complete, but you'll have to sum things up for further destinations.

 

Edit: got another one closer to the usual style of KSP dV maps:

AAGJvD1.png

Edited by Gaarst

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Keep in mind all of those values are for direct Hohmann transfers.  If you get creative with gravity slingshots you can significantly reduce requirements.  Reference the MESSENGER mission in regards to the brutal delta-V requirements for getting to Mercury (one pass by Earth, two by Venus, and three by Mercury before capture).

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12 minutes ago, NathanKell said:

Note: Transfer Window Planner assumes equatorial orbits. That's...not a good assumption in RSS.

No, but TWP gives you a good idea of when a transfer window exists and how much delta-V you'll need.  As always, launch into the plane of your target and go from there.

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6 hours ago, NathanKell said:

Note: Transfer Window Planner assumes equatorial orbits. That's...not a good assumption in RSS.

I am not sure if it has some approximations which are inaccurate at high inclinations needed in RSS but at least it takes small inclinations of stock solar system into account.

Why both of dv maps above say that it takes 7600 m/s from low Titan orbit to surface? Titan have approximately same mass and size than Ganymedes, which have less than 2000 m/s. Orbits are different (100 km vs. 1000 km) but 7 km/s is far more than escape velocity. Does that mean ascent and try to take drag losses into account?

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25 minutes ago, Hannu2 said:

Why both of dv maps above say that it takes 7600 m/s from low Titan orbit to surface? Titan have approximately same mass and size than Ganymedes, which have less than 2000 m/s. Orbits are different (100 km vs. 1000 km) but 7 km/s is far more than escape velocity. Does that mean ascent and try to take drag losses into account?

Yes. Titan has lower gravity but a higher surface pressure than Earth, so much more drag. Just look at the dV for ascent from the surface of Venus.... 27km/s!

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6 hours ago, UnusualAttitude said:

Yes. Titan has lower gravity but a higher surface pressure than Earth, so much more drag. Just look at the dV for ascent from the surface of Venus.... 27km/s!

However, the pressure of it's atmosphere is only about 1.5 atm. ; which doesn't explain by itself the huge difference.

The main explanation is the altitude of the orbits considered by the map : 100 km for Ganymede, 1000 km for Titan. There's a factor 10 here.

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8 minutes ago, Tatonf said:

However, the pressure of it's atmosphere is only about 1.5 atm. ; which doesn't explain by itself the huge difference.

The main explanation is the altitude of the orbits considered by the map : 100 km for Ganymede, 1000 km for Titan. There's a factor 10 here.

Escape velocity from 100 km Ganymedes orbit is only 790 m/s. It can not explain 7 km/s difference. Drag sounds reasonable. Titan's atmosphere is much thicker than Earth's.

 

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20 hours ago, NathanKell said:

Note: Transfer Window Planner assumes equatorial orbits. That's...not a good assumption in RSS.

I assume you mean equatorial origin and destination orbits, it definitely takes eccentricity and inclination of the celestial bodies into account.

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@Red Iron Crown yep. I find MJ's porkchop plotter much more useful. I keep a satellite in the plane of the Moon (close enough to the ecliptic and easy enough to match planes with) for plotting transfers, then pop them over to KAC.

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