I'm trying to understand how much different parts of a rocket engine weigh. For example, according to Wikipedia, Merlin engine weighs 470 kg, of which 70 kg is the turbopump. How is the remaining 400 kg break out? I'm guessing the broad categories could be:

  1. Turbopump(s)
  2. Combustion chamber
  3. Nozzle
  4. Plumbing
  5. Thrust frame
  6. Swing assembly

Totally understand that this breakdown might vary greatly for different engines, but if someone knows directional numbers for different types of engines (turbopump vs. staged combustion vs. expander cycle, maybe on an example of real engines - e.g. Merlin, RL10 etc.), would appreciate the info!

  • $\begingroup$ Two more components: thrust frame (keeps the parts together and transfers load to the rocket) and swing assembly (hydraulic tilt mechanism for thrust vectoring). The RD-191 and RD-193 are interesting in that regard, as they differ only in the presence/absence of thrust vectoring. $\endgroup$ – Rainer P. Jan 30 '20 at 23:49
  • $\begingroup$ @RainerP. - thanks! Updated. $\endgroup$ – irakliy Jan 31 '20 at 1:01
  • $\begingroup$ btw, very interesting info on RD-191/193 - seems like the swing assembly weight was over 300kg or about 15% of the mass. $\endgroup$ – irakliy Jan 31 '20 at 1:09
  • $\begingroup$ @RainerP. surprised the swing assy is considered part of the engine. $\endgroup$ – ikrase Jan 31 '20 at 5:51
  • $\begingroup$ This link is full of fantastic design info, although no weight data: everydayastronaut.com/raptor-engine $\endgroup$ – Carl Witthoft Jan 31 '20 at 13:28

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