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A comment on New Shepard's 8th test flight [video]. Parent comment

Re:New Shepard's 8th test flight [video] by greglindahl on Sunday April 29, 2018 @05:20PM (#16953979)
Worth noting that you're talking about what's going on after the SRBs finish firing. The solids produce a lot of visible exhaust.
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Re:New Shepard's 8th test flight [video] by exDM69 on Monday April 30, 2018 @05:27AM (#16957068)
The space shuttle main engines did fire at liftoff while the SRBs were firing. They may be a bit hard to see at launch but the exhaust mach diamonds are clearly visible e.g. in [0]. They were much more clearly visible in the 7-ish seconds before liftoff, after the SSMEs had been ignited but before the SRBs go off.

[0] https://upload.wikimedia.org/wikipedia/commons/d/d6/STS120La...

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Re:New Shepard's 8th test flight [video] by greglindahl on Monday April 30, 2018 @11:00AM (#16959083)
Sorry, I didn't mean to imply that the SSMEs were not firing at liftoff. Since they fire for a few seconds before the SRBs get lit, I suspect most people know what's going on with them.
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Re:New Shepard's 8th test flight [video] by saagarjha on Sunday April 29, 2018 @05:31PM (#16954018)
Yeah, ammonium perchlorate doesn't burn as cleanly as liquid hydrogen does.
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