Podcast Atlas

如何「兜住」一颗火箭？｜ S10E21

source Episode summary Updated 2026-07-17 Tags: Podcast, Aerospace, Reusable-Rockets, China, Engineering

Summary

This [[WhatsNextKejiZaozhidao|What’s Next｜科技早知道]] episode has [[JerryTaikongSeng|Jerry / 太空僧]] explain how [[LongMarch10B|长征十号乙]] returned its first stage to a sea-based tension net on the [[LinghangzheRecoveryShip|领航者号]] recovery ship. The source treats [[SeaNetRocketRecovery|sea-net rocket recovery]] as a distinct route beside [[Falcon9|Falcon 9]] landing legs and Starship tower catch: it shifts weight and complexity off the rocket, but demands precise ship control, communication, net damping, and post-recovery inspection. Its main contribution is to expand Reusable Rocket Economics from “land the booster” to a full chain of return ignition, guidance, capture, transport, refurbishment, and repeat flight.

Key Claims

  • The episode says Long March 10B / 长征十号乙 used a two-stage, no-booster configuration: a liquid-oxygen/kerosene first stage related to Long March 10A / 长征十号甲 and a liquid-oxygen/methane second stage, which shortened development while testing a reusable first-stage route.
  • The return sequence depends on more than final capture. The first stage separates at high speed, uses grid fins and engine burns for energy management, performs Rocket Propellant Settling, relights for terminal deceleration, and then deploys hooks for the net.
  • Sea-Net Rocket Recovery uses an H-shaped or cross-shaped flexible tension-net frame instead of landing legs. The rocket enters the opening, hooks engage the net, and the net sinks and damps the vehicle before fixing it in place.
  • The recovery shifts mass and shock-absorption burden away from the rocket body, potentially preserving payload capacity, but it transfers difficulty to the ship, net, cables, dampers, communications, and marine operations.
  • 领航者号 Recovery Ship is presented as a large sea platform with a roughly 54 m by 54 m net frame, a DP2 dynamic positioning system, and millisecond-scale ship-rocket communication for position, attitude, and velocity exchange.
  • The source frames the route as an industrial-systems result. Rocket engines, grid fins, [[ElectroHydrostaticRocketServo|electro-hydrostatic servo actuation]], shipbuilding, offshore engineering, arresting-cable experience, and control software all have to work together.
  • Compared with Falcon 9, sea-net capture can tolerate larger final position error and avoids rocket-borne landing legs, but it has higher recovery-platform and transport complexity.
  • Compared with Starship tower catch, the net route is less aimed at immediate tower-side reflying and more at reducing rocket-side hardware while accepting ship logistics and later transfer.
  • The episode uses Zhuque-3 / 朱雀三号 and Long March 12A / 长征十二号甲 as comparison cases where the early flight phases performed well but final landing or recovery failed, emphasizing that failed tests can still produce valuable flight data.
  • Reusable Rocket Turnaround remains the unresolved economic test. A recovered booster still needs external inspection, structure checks, engine and control-system tests, corrosion evaluation, consumable replacement, data review, and recertification before reuse.

Key Quotes

“像把铅笔从十层楼高处扔进地上的笔筒” — the episode’s accessibility analogy for terminal guidance difficulty.

“鬼门关” — Jerry’s phrase for the critical return-stage relight period.

“回收成功” is not yet the same as “高频低成本复用” — the source’s practical distinction between first recovery and mature economics.

Connections

Contradictions

  • No direct contradiction found. The source reinforces the existing Reusable Rocket Economics claim that recovery alone is not enough; it narrows the wiki’s SpaceX-heavy reusable-rocket branch by showing a China-specific sea-net route with different mass, infrastructure, risk, and turnaround tradeoffs.