Are water balloon launchers practical?
Not in their current forms. Current water balloon launchers use either air pressure or slingshots to propel water balloons. While range is increase dramatically, so is danger, and reload time. Most water balloon launchers take 30 seconds or more to reload and repressurize. Being able to use the range of several hundred feet is also a problem because aiming at those distances is difficult. These two factors make current water balloon launchers not practical by any means.