As described above, the autonomous delivery vehicle uses a significantly more efficient flight path of multiple gravity assists around Venus and Mercury, only downside is it takes a very long time to reach its intended destination.
4] The vehicle departs for Venus.
5] First Venus gravity assist.
6] Second Venus gravity assist.
7] Third Venus gravity assist.
8] Fourth Venus gravity assist.
9] Fifth Venus gravity assist.
10] Sixth Venus gravity assist. On the sixth flyby however, the transfer vehicle fires its engine to bring down its perihelion to Mercury's orbital trajectory, since it helps speed things up, and it has the delta velocity for it.
11] First Mercury gravity assist.
12] Second Mercury gravity assist.
13] Third Mercury gravity assist, at this point, the perihelion has dipped too low of Mercury's trajectory, and the vehicle must perform a realignment burn to ensure a proper capture burn.
14] Fourth Mercury gravity assist,
15] Fifth Mercury gravity assist, second realignment burn is executed.