Watch as a playlist: https://www.youtube.com/watch?v=GaGgLGDbEq4&list=PLyV774-3p835n5XZFz4JMvF-Griy_uOdV&index=5
Signal R2 Kit: https://bps.space/signal
Build Signal R2: https://bps.space/build-signal-r2
Piston Ejection System 3D Parts: https://www.thingiverse.com/thing:3032857
Duncan/Uni Knot: https://www.animatedknots.com/duncan/
Making custom ejection charges: http://www.perfectflite.com/Downloads/Ejection.pdf
For more info:
https://twitter.com/joebarnard
http://www.bps.space