Created by formatc, this custom-built LEGO trebucht “works by first raising a (heavy) counterweight on an arm, therefore storing energy. The projectile lies in a sling attached to the other end of the arm. When the trigger is pulled, the counterweight arm falls down and the throwing arm goes up. The sling accelerates and its pouch releases the projectile at high speed.” Video after the jump.

Created by formatc, this custom-built LEGO trebucht “works by first raising a (heavy) counterweight on an arm, therefore storing energy. The projectile lies in a sling attached to the other end of the arm. When the trigger is pulled, the counterweight arm falls down and the throwing arm goes up. The sling accelerates and its pouch releases the projectile at high speed.” Video after the jump.