| 摘要 |
A glider formed from a multi-sided tube open at its ends is disclosed. The body and lifting surfaces of the glider comprise a multi-sided tube including a top wall of planar configuration; a pair of opposed upper side walls of planar configuration integral with the top wall extending downward and outward a distance; a pair of opposed vertical side walls of planar configuration integral with the upper side walls; a pair of opposed lower side walls of planar configuration integral with the side walls extending downward and inward to a point inward of a vertical extension of the top wall and upper side wall intersections; a bottom wall extending between lower end walls and integral therewith enclosing the structure. The bottom wall includes a pair of upward extending planar sections meeting at a midpoint between lower end walls to form a ridge. An upper cut-out symmetrical about a center line of the tube removes a substantial portion of the upper surfaces, and a lower cut-out symmetrical with the center line removes a smaller portion of the bottom wall and works in concert with the upper cut-out to produce maximum lift and stability. In a preferred embodiment the bottom wall is cambered longitudinally with a convex side facing downward to further improve the lift.
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