5 ms·

Something happened just before the fuel pump battery hot-swap on the second stage. Here's some visualisation of the acceleration drop-off scraped from the web s

Something happened just before the fuel pump battery hot-swap on the second stage. Here's some visualisation of the acceleration drop-off scraped from the web stream: https://twitter.com/DJSnM/status/1279583677890965504 https://twitter.com/DJSnM/status/1279583677890965504

mar77i 6y ago
Great Scott! Love his KSP content, where he discusses space trivia to no end...
SergeAx 6y ago
I am not a rocket scientist, but this looks like the hot swap never happened. Lower power on a pump, then it completely drained battery and just stopped, engine is off, end of story. It's a bit disappointing right because this hot-swap-and-then-ditch the battery maneuver is their key know-how, it helps to keep 2S engine simpler and cheaper.
rydre 6y ago
If the engines were shut down, the acceleration would be instantly negative. The decay happens faster, no shutdown until it hits zero.
- SergeAx 6y ago
  For negative acceleration the body needs a force applied in opposite direction. Atmosphere density @ 190 km is nine orders of magnitude less than at sea level, so the drag is negligible.
  - rydre 6y ago
    Gravity is the negative acceleration force.
    - SergeAx 6y ago
      Gravity vector was at the moment directed about 70-75 degrees relativе to speed. You may see the speed decreasing slightly while altitude still increasing, meaning vehicle gone ballistic.