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