From: sylvia@email.invalid   
      
   On 04-Sep-20 3:12 pm, Sylvia Else wrote:   
   > How does this actually help?   
   >   
   > The aerodynamic forces on the craft are a function of its speed and air   
   > density. There's not much one can do about the speed, given that the   
   > craft is accelerating.   
   >   
   > If the craft accelerates more slowly overall, for each speed it will be   
   > traversing less dense air than it would do otherwise. But in that case,   
   > is there a benefit from high initial acceleration and then reducing   
   > acceleration on the approach to max-q?   
   >   
   > Is it really about reducing vibration loads during max-q?   
   >   
   > Sylvia.   
      
   The thing is, it's not as if the rocket thrust and aerodynamic forces   
   are adding together to squeeze the vehicle from both ends. The   
   longitudinal component of the aerodynamic force is transferred from the   
   exterior to the internals of the vehicle, and acts to reduce the   
   acceleration imparted by the rocket. This transferred force is not a   
   function of rocket thrust. For some parts of the internals of the   
   vehicle, it reduces, not increases, the loads.   
      
   I'm not suggesting that the throttle down is not required, but the   
   rationale for it doesn't appear as straight forward as it might seem at   
   first sight.   
      
   Sylvia.   
      
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