An aerial vehicle capable of convertible flight from hover to linear flight includes a body having a longitudinal body axis, a plurality of forward wings, a plurality of aft wings, at least one motor, and at least three aerodynamic propulsors driven by the at least one motor. The video terminal may include internal hardware. In addition, the expression of 1. Preferably, in the downward direction, each virtual channel is assigned a permanent or semi permanent quality of service. The ion mirror decelerates and then accelerates ions so that ions of like mass and like charge exit the ion mirror in a reflected ion beam and reach an ion detector at substantially the same time.