The paraglider, a flexible flying vehicle, consists of a parafoil with flexible wings, suspension lines, and a suspended payload. At this time, the suspension lines have several parameters to be designed. Above all, a parameter called Rigging Angle (RA) is sensitive to the aerodynamic characteristics of a paraglider during flight. In this study, the effect of RA is clarified using the two-dimensional stability analysis and a wind tunnel test. The mechanisms about the parafoil-type vehicle stability are clarified through the experimental and analytical approaches as follows. The RA has an allowable range for a stable flight. When the RA is set out of the range, the parafoil cannot fly stably. Furthermore, the behavior of the parafoil wing in the case of lower RA than the allowable range is different from the case of higher RA. The parafoil collapses from the leading edge of the canopy and cannot glide in the case of lower RA.

中文翻译：

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索具角度对翼型车辆纵向方向运动的影响：基本稳定性分析和风洞试验

滑翔伞是一种灵活的飞行器，由具有机翼，悬挂线和悬挂有效载荷的副翼组成。此时，悬挂线有几个要设计的参数。最重要的是，一个称为“索具角度”（RA）的参数对滑翔伞在飞行过程中的空气动力学特性很敏感。在这项研究中，使用二维稳定性分析和风洞试验来阐明RA的作用。通过以下实验和分析方法阐明了翼型型车辆稳定性的机理。RA具有稳定飞行的允许范围。当RA超出范围时，机翼无法稳定飞行。此外，在RA低于允许范围的情况下，翼型机翼的行为与RA较高的情况不同。