XPost: sci.astro, sci.physics, sci.space.policy   
   From: jfindley@cinci.nospam.rr.com   
      
   In article ,   
   jfmezei.spamnot@vaxination.ca says...   
   >   
   > On 2018-06-12 19:00, Jeff Findley wrote:   
   >   
   > > Bullshit.  SpaceX is not demonstrating any new technologies.   
   >   
   > Is friction fit welding for the tanks a first for rockets?   
   >   
   > I know it isn't "new" since it was used by Airbus and others, but   
   > wondering if it was first use in rockets/tanks.   
      
   Doesn't matter if it's a "first for rockets", it's been done before in   
   other industries (aerospace at that).  So, it's absolutely existing   
   tech.  Again, SpaceX hasn't invented any new technologies here.   
      
   > Since SpaceX is developping composite tanks for BFR, was there any   
   > though of puttting composite tanks for Block 5  Falcon 9?  Just   
   > wondering if there would be a big payback in weight or if the difference   
   > not worth the trouble of developping/testing/certifying such a tank.   
      
   Composite structures/tanks are also not new.  Composites are heavily   
   used in aerospace.  For space specifically, the X-33 program designed   
   and built cryogenic composite tanks.  They failed during testing more   
   due to their complex geometry than anything else.  So no new tech there.   
      
   BFR/BFS avoids the complex geometry problem and goes back to a more   
   "delta clipper" sort of design.  Also not new, at least in concept.   
      
   Jeff   
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