why does the Delta IV rocket engine have a smokeless exhaust?

  • 1 Replies
  • 394 Views

0 Members and 1 Guest are viewing this topic.

*

Offline Shaheen Mongam

  • First timers
  • *
  • 1
    • View Profile
United Launch Alliance (ULA) has launched the world's heaviest rocket of all the time last week. I observed that its having an almost smokeless exhaust compared to other rockets. Why is it so
« Last Edit: 15/06/2016 11:38:41 by Colin2B »

*

Offline chiralSPO

  • Global Moderator
  • Neilep Level Member
  • *****
  • 1913
    • View Profile
I believe (and wikipedia confirms: https://en.wikipedia.org/wiki/Delta_IV#Delta_IV_first_stage) that the first stage of a Delta IV rocket uses liquid hydrogen and liquid oxygen as propellants. This combination will only result in gaseous water (no smoke), which is also very hot, so it may have time to dissipate before condensing into vapors, which might be visible.