Abstract: A method and a device for the launching of a projectile is disclosed. A front and aft plate are coupled to an expansion vessel having an axis so that when the volume of the expansion vessel increases the pistons move in opposing directions along the axis. A projectile is so disposed that it is launched in a desired direction by the motion of the front plate. The motion of the plates along the axis is limited in that the two plates are connected to each other by an extendible coupling structure.

Abstract: A method for providing a pilot with information associated with at least one region of a field of view visible to the pilot from within a cockpit without requiring a visual display. The method includes the steps of determining an eye gaze direction relative to a given frame of reference for at least one eye of the pilot, determining a reference direction relative to the given frame of reference, comparing the eye gaze direction with the reference direction, and if the eye gaze direction and the reference direction are equal to within a given degree of accuracy, generating audio output audible to the pilot and indicative of information associated with the reference direction.