上反角

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 .

在一定范围内，改变上反角对横向和航向稳定性的影响与张开比的作用相反。

Within a certain range , the variation of the dihedral angle plays an inverse role on the lateral as well as the directional stability as that of the slackness ratio .

联结翼布局飞机可以被定义为由上反角的后掠前翼和下反角的前掠后翼联结在一起形成菱形框架结构的飞机。

The Joined-wing aircraft maybe defined as an aircraft that incorporates tandem wings to form diamond shapes , in which forewing is aft swept with positive-dihedral angle and rear-wing is forward swept with negative-dihedral angle .

在实验中改变的因素包括伞翼后缘形状，翼面上的肋条，伞翼顶角，边条小翼，外翼弦长，龙骨形状，伞翼的张开比和上反角。

The rib-strips , the apex angles , the strakes , the chord of the outer part of the wing , the shape of the keel , the slackness ratio , and the dihedral ange .