Good power output.
No knock required on arrows.
Longer draw than a standard bow.
So very! light.
Simple to build.
Cheap - cost £2.50 for proper catapult rubber preferred by the Chinese apparently (big following of catapults).
Pimp this up and she would be awesome - I kinda like her dirty and visceral though.
Easily shoot 20 meters.
Would work well for short range hunting of small game or fish.
Ammo carried on the frame.
Step 1: Materials and tools
saw to cut the bike rim - scissors - Snips or some way to remove the spokes from the wheel - file to tidy cuts - pliers to bend.
Materials for the basic build -
Bike wheel - eyelets of some description - inner tube from wheel - catapult rubber (or you can use cut down inner tube but it is not as powerful) - retainers for the threaded end of the eyelets (plasterboard expanding grommets in this case) - a spoke for the sight