在排球扣球时，佯扣短平快，突然向前冲跳，“飞”到二传手前扣半高球。前飞的助跑路线与网夹角很小（有时可顺网助跑），击球时利用向左转体和收胸动作带动手臂挥动击球。 单脚起跳进行前飞扣球时，助跑的最后一步跨出左腿，步幅不宜过大，左脚蹬地的同时，右腿和双臂配合向前上方摆动，使身体向前上方冲跳。击球时，上体向左转动带动手臂挥动击球。击球后，双脚同时落地，以缓冲下落力量。
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The results show that it is stable in the given forward flight. But the instability arises with the decrease of the bending and torsion stiffness of the shaft.
对某新型直升机的气动/机械稳定性进行了分析，结果发现对于给定的前飞状态是稳定的，但是随着传动轴弯曲和扭转刚度的降低出现不稳定现象。
参考来源 - 直升机旋翼/机身耦合系统气动/机械稳定性分析新方法 A NEW AEROMECHANICAL STABILITY ANALYSIS METHODOLOGY FOR COUPLED ROTOR/FUSELAGE SYSTEM OF HELICOPTERS·2,447,543篇论文数据，部分数据来源于NoteExpress
为了模拟前飞桨叶间的相对运动，网格布局采用了运动嵌套网格方法。
The moving overset grid method is employed to account the relative motion among the blades which are rotating, cyclic pitching and cyclic flapping.
这可以持续反对前飞诱导阻力，在没有重大损失摆脱垂直放在支持飞机的重量。
That can be sustained against the induced drag of forward flight without significant loss in to vertical lift out puts to support the weight of the aircraft.
然后依据通用结构模型，利用飞行实测数据，得到悬停和前飞状态下的辨识模型。
According to the generic structural model, specific parameterized models in hover and forward flight are obtained by using the flight test data.
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