Mash together an electric drill, some thick rubber bands, and a quiver of arrows for a rapid-fire crossbow.
Joerg Sprave found the “missing link” to build a fully auto crossbow with rack and pinion design. The innovation comes as no surprise: His YouTube channel is a library of outlandish homemade launchers.
By attaching a battery-powered Mikita drill to a flywheel, Sprave managed to harness the tool’s rotational force to propel projectiles. That means arrows, lots of ’em.
With the mechanism dialed in, Sprave designed an exchangeable magazine for quick reloading. Check it out below.