Starship Hot Staging: More Complex Than You Think!
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In this episode we will examine the critical design considerations that had to be addressed to allow Starship to execute its hot stage maneuver without destroying both vehicles in the process! At the end you will hopefully gain an appreciation for the amount of work that went into being able to pull this off in a ridiculously short timeline.
After covering the upgrades that needed to be made for this to be successful, we will get deeper into the physics of hot staging. This isn’t a unique mode of stage separation but the way it is executed is unlike any other rocket that has done this.
Lastly, we will address all of the speculative explanations about what caused Booster 9 to explode shortly after stage separation. The goal is not to come to a definite conclusion, but get a visual understanding of each theory, and then determine which ones actually seem feasible to the real cause of failure.
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CSI Starbase Production : Geoff Allan
The Ring Watchers - Super Heavy Propellant Distribution Article
Huge thanks to the following photographers and content creators who make all of this possible!
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LabPadre - 24/7 Starbase Livestreams
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Cosmic Perspective w/ Audio from Andrew Keating
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Timestamps
00:00 - Elon Starship Presentation
01:17 - Introduction
07:04 - HSR Design - Overpressure Prevention
10:05 - HSR Design - Max Q Durability
14:00 - HSR Structural Verification Testing
19:14 - HSR Design - Ignition Survivability
24:17 - S25 Aft Heat Shield Explained
29:40 - S27’s Sudden Death
31:40 - S25 Aft Heat Shield Upgrade
33:47 - S27 Resurrection / Heat Shield Testing
37:00 - Falcon 9 v Starship Stage Separation
40:33 - Brilliant Sponsor Segment
42:00 - RVac Differential Thrust At Stage Sep
45:16 - Grid Fin Rotation During Hot Staging
49:30 - Raptor Relight Performance Issues?
51:50 - Booster Engine Plumbing - CH4
54:46 - CH4 Downcomer Collapse?
57:05 - Booster Engine Plumbing - LOX
58:04 - Fuel Slosh Intro
60:47 - RHS Fuel Slosh Simulation Explained
67:08 - Catastrophic Engine Cavitation Damage?
70:20 - B10 Upgraded Slosh Baffles
71:18 - Engine Plumbing Damage?
76:28 - Lessons Learned
77:08 - Outro
Music Credits
2:30 “Do You Remember“ prod. by kochetkovv
7:03
11:08
14:21
19:28
20:52
24:51
30:19 Collapse - Spaceflight Memories
31:40 Electric TVC - Spaceflight Memories
33:53
37:47
40:33
41:53
46:07 Saving Starship - Spaceflight Memories
53:04
57:00
67:04
73:31
74:57
79:14 Beat from “The Last Song Produced by Ghost“
Last but not least I want to give HUGE SHOUTOUT to the entire CSI Starbase team on discord. This dedicated team of 200 agents with specialties ranging all across the board, has been crucial in getting the most accurate info for these episodes. Couldn’t do it without yal!
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