August 28, 2010
News - Enginursday: RockON!
about 2 years ago
I dont see why you would put “(impossible)” in your last line here. As stated by DonQ above, not only does the force provided by the rocket motor increase gradually, but the weight of the complex as a whole decreases. This results in a fairly consistent acceleration, which was done by design when these launch vehicles were developed (operation BumbleBee) so that their payload sensors would survive, while minimizing launch-to-intercept times. (note: I am certain EXACTLY 40g is unlikely, but an average of ~38g is quite possible)
Another point to others in this thread, the author did place the two words “ and separates” within that sentence, an action that occurs a good 1 to 3 seconds after burnout has completed (which the video shows first stage burn to be a bit longer than 2 seconds, just counting in my head). So since we are now talking about the distance traveled during the burn as well as the distance traveled while coasting, I do not think the author was too far off in their statement.
Not posting aggressively, always happy to see people fact checking. I do believe the author should have put that the first stage lasts about 5 seconds.
EDIT: As I know for a fact that a terrier booster was used (at least in the video), the facts about the terrier booster here: SOURCE. should be applicable.
6 second burn
3.1km burnout altitude
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