BTW that is an outdated design for the CZ-9. Here is the latest version:
Replying to: First 220 ton class YF-90 full engine test successfully conducted -- motif	Post Reply Forum

Canis Majoris

12/20/2024, 08:08:50

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The latest version uses the YF-90 on the second stage, until it presumably gets replaced by a smaller engine as reusability gets designed into the second stage as well.

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