I"ve been looking at pneumatic launchers.   i dont see how the launch carriage is propelled.   once the air tank is triggered, how do the mechanics of launch work?

New to DIY Drones.  Beginning the self build exploration phase.I'd like to build an H HexacipterFor the H Hexacopter and  X Hexacopter layout   would the flight controller be the same for these ?   Or are flight controllers designed based on…