Rocket Propellant Settling

Rocket propellant settling is the small acceleration step used to move propellant back toward tank outlets before a critical engine relight. In 如何「兜住」一颗火箭？｜ S10E21, Jerry / 太空僧 describes it as a key return-stage hurdle for Long March 10B / 长征十号乙.

After separation and coast, propellant can float, slosh, or leave bubbles near the feed system. A settling maneuver gives the tanks enough acceleration for stable propellant supply before the return burn or terminal landing burn. In reusable launch, this detail matters because a late relight failure can erase a flight that otherwise completed ascent, separation, and much of descent successfully.

Connections

• Long March 10B / 长征十号乙, Zhuque-3 / 朱雀三号, and Long March 12A / 长征十二号甲 — source cases where terminal ignition and recovery reliability are central.
• Sea-Net Rocket Recovery — capture can only happen after the return burn and terminal descent remain stable.
• Electro-Hydrostatic Rocket Servo — another subsystem in the precise terminal-control chain.
• Reusable Rocket Economics — repeated reuse depends on making relight reliable, not heroic.