Methods and apparatuses for launching unmanned aircraft and other flight devices or projectiles are described. The body has an accommodating space. 2 ml30 minutes by adding about 0. Such a semiconductor may be part of a device, which may include any of a variety of devices and combinations thereof, and a variety assembling techniques may be used to fabricate devices from such a semiconductor. A barrier prevents the aerosol container from resupplying the accumulation chamber at a high rate during the spray phase, preferably due to a textured interface between the barrier and a passageway in which it is housed.