From: klammerj@NOSPAM.a1.net   
      
   On 08/27/2021 09:36 PM, JF Mezei wrote:   
   > 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?   
   >   
   > 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?   
   >   
   >   
   > 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).   
   >   
   >   
   > 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.   
   >   
   Have they(BE-4) ever even specified an Isp.   
   Last time I looked I couldn't find anything.   
   From that alone it doesn't really look like a serious operation.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)