Abstract: A toy projectile launching assembly for safely permitting the projectile to be launched only in predetermined directions and only under at predetermined pressure levels through the use of redundant safety mechanisms and pressure relief systems. The launching assembly has a fluid system enabling multiple launches without the need for replacing a fluid such as water in the launch assembly. The launch assembly provides water and pressurized air for a projectile such as a rocket to launch from a self-contained, portable launching assembly, which is easy to operate.

Abstract: Within a piston cylinder of a pneumatic engine, the system includes a piston proportioned for complemental travel within a piston cylinder, the piston having a radial compression surface and elements for effecting the axial reciprocation of the piston within the piston housing. The system further includes a piston seal including an element for securement to the compression surface of the piston and an integrally dependent resilient annular skirt normally biased inwardly toward a longitudinal system axis, the skirt, in combination with the securement elements, defining a radius of less than that from the system axis to interior walls of the cylinder during low pressure (return stroke) phases of a work cycle of the pneumatic engine and, during high pressure/compression stroke phases, defining a radius greater than that from the system axis to the inner wall of the cylinder.