3 HN users recommended this explainer3 months2019score 3.5
Years with an HN recommendation, 2007–2026
Recommended whenever rocket engine cycles or turbopumps come up, as a clear introduction from a trusted explainer.
Scott Manley explains the plumbing of rocket engines, including pressure-fed, gas generator, expander and staged combustion cycles. He shows why more complex designs exist and what they gain.
“Scott Manley has a fantastic video explaining all of this” (HN, 2019)
Scott Manley has a fantastic video explaining all of this: [this video] In terms of efficiency, it's worth mentioning that even tiny gains have big impacts because of the rocket equation. Having a 1% boost the entire time the rocket is running can have an enormous impact in the overall velocity, or reduce the overall amount of fuel needed for the same targets.
Calling Raptor "really complex" still manages to undersell it a bit, in my opinion. It's pushing the state of the art in rocket engine design pretty significantly. It's the first full flow closed cycle engine to fly. For folks who are interested in learning more about rocket engines, Scott Manley is a great resource: [this video]
Video list and Hacker News comment labels from HackerTube (prompted by @karpathy), released under ODC-By 1.0, built on the open-index/hacker-news archive. Hacker News data is provided by Y Combinator; comments remain the work of their authors. Video titles, channel names and thumbnails belong to their creators and are shown via YouTube. HackerTube Watch is an unofficial edition. Data export of 2026-10-31.
Plays via YouTube's privacy-enhanced embed
3 Hacker News comments
From the HN archive; up to 20 kept per video, favoring different commenters. Recommendations first.