Gravity assist is the method in which a celestial body's gravity to change trajectories, or increase/ decrease the speed of a craft. This an also be used in stock SFS.
So, if we set the trajectory such that when we enter the Celestial body's Sphere of Influence, the trajectory moves towards the direction of the planet's revolution, the speed of our craft increases and when our trajectory is against the motion of the body, the speed decreases. This is because while going with the planet's motion the gravity of the planet pulls us along with it, thus the speed increases, whereas, while going against the motion of the planet, the gravity pulls you in a way like firing retrograde, thus decreasing the speed.
Remember this-(Simplified for all) [Made not by any scientist]- Against motion (Direction of Movement meant here) of planet, our speed goes low, with motion of the planet, our speed goes high
Now here is how it works
1)The Spacecraft is in High Earth orbit.
2) A burn to get a moon Encounter (Note that we will be going opposite to the direction of moon's motion, thus, our speed would decrease
3) After entering Moon Sphere of Influence, the trajectory changes, and as our speed lowers, the orbit gets smaller even after firing once.
Final orbit
I will post more information soon
Till the time, Bye!
So, if we set the trajectory such that when we enter the Celestial body's Sphere of Influence, the trajectory moves towards the direction of the planet's revolution, the speed of our craft increases and when our trajectory is against the motion of the body, the speed decreases. This is because while going with the planet's motion the gravity of the planet pulls us along with it, thus the speed increases, whereas, while going against the motion of the planet, the gravity pulls you in a way like firing retrograde, thus decreasing the speed.
Remember this-(Simplified for all) [Made not by any scientist]- Against motion (Direction of Movement meant here) of planet, our speed goes low, with motion of the planet, our speed goes high
Now here is how it works
1)The Spacecraft is in High Earth orbit.
2) A burn to get a moon Encounter (Note that we will be going opposite to the direction of moon's motion, thus, our speed would decrease
3) After entering Moon Sphere of Influence, the trajectory changes, and as our speed lowers, the orbit gets smaller even after firing once.
Final orbit
I will post more information soon
Till the time, Bye!
