XPost: sci.astro, sci.physics, sci.space.policy   
   From: fjmccall@gmail.com   
      
   JF Mezei  wrote on Wed, 13 Jun 2018   
   02:15:38 -0400:   
      
   >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.   
   >   
      
   I suspect it was used for wheels on rail cars and other similar things   
   long before it was used on aircraft (and frankly it seems a poor fit   
   for aircraft use).   
      
   >   
   >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.   
   >   
      
   I doubt it.  They were more interested in fixing the existing COPV   
   design than grounding waiting for a whole new technology.   
      
      
   --   
   "The reasonable man adapts himself to the world; the unreasonable   
    man persists in trying to adapt the world to himself. Therefore,   
    all progress depends on the unreasonable man."   
                                         --George Bernard Shaw   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)