4 ms·
I believe this is what the engines are doing during the majority of the ascent of the Starship SN8 test vehicle[0]. You can see the engines gimbaling very sligh
by zlsa 6y ago
I believe this is what the engines are doing during the majority of the ascent of the Starship SN8 test vehicle[0]. You can see the engines gimbaling very slightly in a circular pattern.
[0]: https://youtu.be/ap-BkkrRg-o?t=6516 https://youtu.be/ap-BkkrRg-o?t=6516
- aidenn0 6y agoAnything controlled by a PID can easily end up in a circular pattern, so it's not a given that this was to avoid stiction. [edit] 1 dimensional PIDs can end up in a sinusoidal dynamic equilibrium, and a 2 dimensional sine wave is an ellipse.
- HanyouHottie 6y agoIt's not an ellipse if the axes have different periods: https://www.wolframalpha.com/input/?i=x%3Dsin%28t%29%2C+y%3Dsin%283*%28t%2Bpi%2F2%29%29 https://www.wolframalpha.com/input/?i=x%3Dsin%28t%29%2C+y%3D... (Is there a name for this kind of curve?)