In this craft, i have a log that's outputting the magnitude of the velocity vector, and it's all over the place, even when not under engine thrust and outside of atmosphere.
It seems like it is just the payload side interstages causing jitter because of the wobbly nature of them acting as physic joints. In a frame, they may steal part of the momentum and then give it back in another if they just happen to synch the difference can be huge because of their large mass relative to the rest of the payload.
It seems like it is just the payload side interstages causing jitter because of the wobbly nature of them acting as physic joints. In a frame, they may steal part of the momentum and then give it back in another if they just happen to synch the difference can be huge because of their large mass relative to the rest of the payload.