Based on the principle of flight of fan wing aircraft, realizing methods of VTOL are preposed by changing the Angle of attack and increasing chord length of the tail.
This paper analyses the traditional automatic control method and mechanism of nc cold frame bender. The basic principle of control method for measuring chord length is described.
分析了传统的数控肋骨冷弯机控制方法与机构,阐述了弦线测量控制法的基本原理。
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In this paper, the existence theorem of midpoint chord of quadratic curve, as well as its proof, is given via methods of projective geometry and polarity principle.