# yomahabaca

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1. ## Delta v of a trans-Mars injection (TMI)

It's true, I was wrong about that
2. ## Delta v of a trans-Mars injection (TMI)

So if this time I understood correctly, the more one is in a high energy orbit (apoastre and periapsis high) the easier it is to go up its apoastre (ignoring the Oberth effect). If we ignore the Oberth effect, an acceleration of 100 m/s at the periapsis of orbit A2 would increase the apoastre less than the same acceleration on orbit A1 because the orbital energy of orbit A2 is lower than that of the A1 orbit. The lower an orbit has its periapsis, the lower its orbital energy. (If the Oberth effect is taken into account, the A2 orbit would increase its apoastre more than the A1 orbit.) It is as if, the lower an orbit has its periapsis, the more it is held by gravity, which reduces the increase in apoastre for the same delta v applied to the periapsis.
3. ## Delta v of a trans-Mars injection (TMI)

If I understand correctly, the A1 orbit has less energy because it is less in the gravitational well of the Earth and therefore it is easier to exit (raised the apoastre) while the A3 orbit has its periapsis closer to Earth (deeper in the gravitational well) then its average orbital speed is higher and its orbital energy is higher so it is more difficult to raise the apoastre. The A3 orbit benefits more from the Oberth effect than the A1 orbit, but the effect is minor compared to the orbital energy, it becomes the majority for more eccentric orbits such as the A2 orbit.
4. ## Delta v of a trans-Mars injection (TMI)

Thanks a lot ! it really helps me : )
5. ## Delta v of a trans-Mars injection (TMI)

Thank you ! I have another question, is the Oberth effect responsible for the fact that an acceleration of 100m/s from the perigee of a 200km/300km orbit will increase the apogee less than an acceleration of 100 m/s applied to the perigee of an orbit of 200km/10000km?
6. ## Delta v of a trans-Mars injection (TMI)

But there is something that I don't understand, as Leganeski said, on the other side of the planetary orbit we move more slowly with respect to the Sun, so how can the Oberth effect work in this situation (trajectory to go to the inner planets)? isn't the Oberth effect supposed to be stronger the faster the satellite/vessel goes? but in this situation the satellite goes slower than the Earth around the Sun.
7. ## Delta v of a trans-Mars injection (TMI)

Thanks for the explanation ! : )
8. ## Delta v of a trans-Mars injection (TMI)

Hello, I play Ksp Rss and I was wondering why does it only take about 600 m/s more than Earth's escape velocity to have an encounter with Mars while it takes much more Delta v (about 3 km/s) from a solar orbit (same as Earth orbit) to have an encounter with Mars? What explains this difference? Is it the Oberth effect or something else that explains this? Thank you !
9. ## Flyby Finder for Ksp Rss

Hello, in the Flyby Finder mod, I was wondering what the Start Vz parameter means? Thank you !
10. ## [WIP][1.8.1, 1.9.1, 1.10.1, 1.11.0–2, 1.12.2–4] Principia—version Ἱπποκράτης, released 2022-11-23—n-Body and Extended Body Gravitation

So the equatorial bulge in addition to being able to cause nodal precession it can also slightly accelerate and decelerate a satellite in orbit. I didn't know that, thanks ! Incredible, the detail and the realism of this mod ! Are you sure there are stable geostationary orbit positions? I believed that no position in geostationary orbit was truly stable and required all stationkeeping due to the influence of the Moon.
11. ## [WIP][1.8.1, 1.9.1, 1.10.1, 1.11.0–2, 1.12.2–4] Principia—version Ἱπποκράτης, released 2022-11-23—n-Body and Extended Body Gravitation

Hello, I use the pricipia mod on Ksp rss ro and I noticed that if I was in the most perfect possible low polar circular orbit around the Earth the geocentric speed of my ship always slows down when it passes above poles and reaccelerates when it passes over the equator. Is this normal? A ship in a perfectly circular orbit would be supposed to always stay at the same geocentric speed, wouldn't it? Thank you !
12. ## [1.12] Real Solar System

Thanks for the explanation ! I understood why in my previous version of KSP RSS RO Jupiter had the correct axial tilt, it is because I used the principia mod, this mod also positions each planet with the correct axial tilt.
13. ## [1.12] Real Solar System

Hello, I installed the real solar system and realism overhaul mods with ckan and I noticed that the axis of rotation of Jupiter is not at all at the right inclination, what is causing this problem? Is there a way to fix this? (previously I always installed real solar system and realism overhaul with ckan and I never had a problem like that) Thank you !
14. ## Delta v inclination change

What formula did you use to arrive at the second result of your image?
15. ## Delta v inclination change

Hello I noticed in ksp rss ro principia that when I make a 90 degree tilt change around the earth it takes me a delta v of 12100m / s as shown in this picture on the other hand when I calculate the delta v necessary for the maneuver it gives me = 10 930 m / s why are the results different?
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