The NASA Student Launch was held in Huntsville last weekend April 15 and the video from the NASA TV live stream is now available here:
2023 NASA Student Launch: Launch Day
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University of Massachusetts, Amherst Launch is at:
1:37:28
When the rocket was initially descending under the drogue, there was a bunch of smoke trailing the booster. Is that just the after effects of an 'L' motor burn, or something else?
There is a smoke grain that comes with a 75mm CTI motor, similar to the delay grain on smaller motors that burns before the ejection charge, which allows you to track the rocket visually after motor burnout.
