A method, system and program product implementing storage of a mesh plane file using a multiple line shape, possibly with the storage of lines also, to reduce file size. The heating resistor has first and second set temperatures CH and CL. During each turn of the driving shaft, four propulsion strokes are exerted consecutively. The wing surface extends between the central section and the side wing sections to provide a lightweight wing structure that provides sufficient lift for the device when being towed to enable the device to hover above the surface for long distances. A central area of the base is designed at the penetration area and the reinforcement area is arranged around the penetration area.