From: snidely.too@gmail.com   
      
   Friday, Snidely quipped:   
   > On Friday, Jeff Findley queried:   
   >> In article , jfmezei.spamnot@vaxination.ca   
   >> says...   
   >>>   
   >>> Watching a Scott Manley video on the end of the Atlas and Delta IV   
   >>> rockets.   
   >>>   
   >>> Apparently, Blue Origin is having some delays delivering first BE-4   
   >>> engines that ULE needs for the Vulcan rockets that is to replace the   
   >>> older ones.   
   >>>   
   >>>   
   >>> Out of curiosity, from a development project point of view, would   
   >>> comparing SpaceX Raptor to Blue Origin BE-4 be fair or is BE-4  in sucn   
   >>> a different lcass that it is normal it would take much longer to develop?   
   >>   
   >> BE-4 isn't a full flow staged combustion engine.   BE-4 is an oxygen-   
   >> rich staged combustion engine cycle.  So, bragging rights to Raptor.   
   >>   
   >>> Asking my buddy Mr Google, apparently BE-4 is only 10% more powerful   
   >>> than Raptor.  So woudln't that be considered to be in same class?   
   >>   
   >> If all other things were equal.   They're not.   
   >>   
   >>> SpaceX seems to have gotten Raptor off the ground (litterally) very fast   
   >>> compared to Blue Origin.   
   >>>   
   >>> Is the Blue Origin much more complex and taking longer to develop, or is   
   >>> this a case of working out all the bugs before delivering to Boeing/ULA   
   >>> whereas SpaceX started to launch before engine was finished and worked   
   >>> out the bugs with its iterative testing? (some of those busg were   
   >>> related to tanks/pressure for relighting during landing, so not quite   
   >>> engine related).   
   >>   
   >> BE-4 development was never hardware rich.  They are still reportedly   
   >> fighting turbopump issues.   
   >>   
   >>> Or is this a case of SPaceX having much mroe experience building engines   
   >>> with Merlin vs Blue Origin starting from scratch?  SpaceX is just about   
   >>> to unveil its version 2 of Raptor with a lot of design optimizations.   
   >>   
   >> You seem to have answered your own question.   
   >   
   > Count the Raptors (even if you limit yourself to ones not scattered across   
   > the beach).   
      
   Have there been 29 BE-4s made yet?  This may require leaked   
   information.   
      
   I have seen video shot at Blue Origin's Florida facility, likely as a   
   NASA TV item, and included in that was a test firing of a BE-3, which   
   is needed for the Blue Team's moon lander.   
      
   /dps   
      
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