From: alain245@videotron.ca   
      
   On Aug/28/2021 at 02:55, Johann Klammer wrote :   
   > 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.   
      
   Secretive operations can be very serious.   
      
      
   Alain Fournier   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)