Germany has some pretty strict rules about how powerful bottle rockets can be and when you can shoot them off, but you can be sure that petty rules won't slow down Joerg Sprave over at The Slingshot Channel. He prepared for the 48 hour window when Germany's strict fireworks rules are loosened by building a giant launching tower to lift his rockets skyward.

His idea was that by timing things carefully, you could launch a rocket high into the sky while the fuse was still burning, then the black powder would take over propulsion once the rocket reached the peak of its slingshot lift.