From: alain245@videotron.ca   
      
   On Mar/18/2021 at 16:12, JF Mezei wrote :   
   > I know SLS doesn't have much love.   
   >   
   > But watching the second test fire, prompts this question:   
   >   
   > Does the SLS core stage tank use the same foam as for the Shuttle's ET?   
   > Would all the post-Columbia research and refinements still be considered   
   > to be "current" or would much progress have been made since resulting in   
   > new significantly different foam formulation?   
   >   
   > In terms of the Shuttle ET, it was mostly smooth except for perhaps 1/5   
   > that had ridges on the surface. What was the purpose/reason for only   
   > that portion having ridges? SLS doesn't appear to have such a zone.   
      
   I don't know. I have never noticed those smooth part and part with   
   ridges. But I would guess that it has something to do with a big part of   
   the tank containing H2 and a much smaller part of the tank containing O2.   
      
      
   Alain Fournier   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)