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ArexX1 SRB to orbit

a guest Nov 26th, 2015 114 Never
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  1. http://www.astronautix.com/lvs/ares.htm :
  2.  
  3. masses:
  4. 625000 s1
  5. 787700 s2
  6. 172000 s3
  7.  
  8. Original launch:
  9. 1584700 s1+s2+s3
  10. 959700 s2+s3
  11.  
  12. Modified launch:
  13. 1422000 s1+s1+s3
  14. 797000 s1+s3
  15.  
  16. https://www.nasa.gov/pdf/354470main_aresIX_fs_may09.pdf :
  17. Peak speed = dv = Mach 4.7 = 1.6km/s
  18. (actually higher, due to losses, but let's run with it; better to underestimate than overestimate.)
  19.  
  20. Plugging standard launch into http://www.quantumg.net/rocketeq.html
  21. s1+s2+s3 -> s2+s3 @ 1.6km/s
  22. ISp = 325.4 s
  23.  
  24. Plugging modified launch:
  25. s1+s1+s3 -> s1+s3 @ 325.4
  26. dv = 184
  27. s1+s3 -> s3 @ 325.4
  28. dv = 4.9
  29. s1 -> 50 tons @  @ 325.4
  30. dv = 3.9
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