Build your own working Lego ballista

Jason Allemann has come up with a design for Lego ballista that can launch a 2×4 brick 15 feet (which will let you hit almost any target in even the biggest dioramas). The best part is that he has posted step-by-step instructions for you to build your own. Time to get ready for battle!

Flying Elephant VS LEGO Ballista. Fight!