Invented by the Alliance as they explored Kalimdor, the scout balloon is a backpack containing a balloon inflated with hot air produced by a tiny phlogiston engine. A small propeller on the pack allows the pilot limited maneuverability, but scout balloons are usually tethered to a tree and used simply for an elevated view of the surrounding territory. Cheap and simple to operate, scout balloons are becoming increasingly popular. It moves at 10 miles per hour and has a crew of 1.