From: robertaw@drizzle.com   
      
   In article <10kuaec$3e1ub$1@dont-email.me>,   
    Lawrence D’Oliveiro  wrote:   
      
   > On Thu, 22 Jan 2026 16:48:19 -0500, Cryptoengineer wrote:   
   >   
   > > However, I have questions as to whether Mach 25 is achievable in a glide   
   > > vehicle - LEO orbital velocity is about Mach 18. How are you going   
   > > to make the vehicle go down?   
   >   
   > Mach 25 is about LEO orbital speed.   
      
   LEO orbital speed is about 25 thousand feet/sec, while the speed of   
   sound down where we live is about 1100 feet/sec, elsewhere it is   
   different. For example, see this chart   
   (https://en.wikipedia.org/wiki/U.S._Standard_Atmosphere#/media/File:Compa   
   rison_US_standard_atmosphere_1962.svg) of the atmosphere from sea level   
   to Karman line at 100 Kilometers. There is significant variation of the   
   speed of sound.   
      
   --   
   "We have advanced to new and surprising levels of bafflement."   
   Imperial Auditor Miles Vorkosigan describes progress in _Komarr_.   
   —-----------------------------------------------------   
   Robert Woodward robertaw@drizzle.com   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)