上反角，机翼基准面与水线之间的夹角。
DIHEDRAL, the Angle between the wing reference plane and water line.
改变连翼机前翼上反角和后翼下反角对纵向气动特性影响不大，对横向气动特性有明显影响。
The changes in dihedral of front wing and cathedral of rear wing have little effect on longitudinal aerodynamic characteristics but large effect on lateral-directional characteristics.
通过理论计算，定量地研究了小型无副翼电动无人机的横航向操稳特性，对不同机翼上反角和垂尾面积进行了横航向模态特性计算与分析。
The lateral-direct aerodynamic data of a SUAV without any aileron with different dihedrals and vertical-tail areas were obtained through an aerodynamic estimation method.
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