 Self-regulation of the sport and widespread European availability of single use 'cartridge' motors seemed to ensure a future, but in recent years the cartridges (known as "Rapier" units) have become difficult to obtain, due to a reclassification from "smoke producing devices" to "fireworks".They are still produced in the Czech Republic, but importing/exporting them is problematic at the present time (2014).In electric-powered models, the powerplant is a battery-powered electric motor.