Rubber band engineer: build slingshot-powered rockets, rubber band rifles, unconventional catapults, and more guerrilla gadgets from household hardware

Handheld shooters. Many-thing shooter ; PVC slingshot rifle ; Crossbow ; Bow and arrow

Mini siege engines. Pyramid catapult ; Enhanced mousetrap catapult ; Floating arm trebuchet ; Da Vinci catapult

Hydraulic + pneumatic power. Hydraulic and pneumatic systems: the basics ; Pneumatic magic box ; Extending grabber ; Robot arm ; Hydraulic fighting robots

Flight. Improvised darts ; Slingshot rocket ; Rubber band helicopter

Other gadgets + contraptions. Paper plane launcher ; Wire loop game ; Propeller-powered car.

Handheld shooters

Mini siege engines

Hydraulic + pneumatic power

Flight

Other gadgets + contraptions.