With a nod to the public domain, I'd like to introduce Jörg Sprave & his Slingshot channel to Steemit
The Slingshot Channel
The presenter, Jörg Sprave, has a passion for rubber powered projectile launching devices - many of which he builds. But he doesn't stop there - compressed air is also a favourite of his. He recently demonstrated an air powered device that delivered well in excess of 1000 joules of energy to the projectile - it went through four archery mats, a car door and then lodged in a riot shield.
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