I would like to know if exist some crossbow without the bow.
I ask because for me one of the disadvantages of using crossbows is the size of it (very wide).
The bow basically is a leaf spring, why not change it for a helical coil spring?
Some Aluminium Pipe (similar to this one: h t t p://image.made-in-china.com/2f0j00NMmaDlvFAfrp/Aluminium-Extrusion-Profile-Aluminium-Pipe-DSAL-04-DSFT090628B-.jpg ), inside one (or more) powerful helical coil spring, cables with or without pulley system and that's it.
This would be an compact system.