This paper addresses the flight dynamics modelling, trim, and dynamic analysis of an intermeshing-rotor helicopter, indicated as synchropter. This configuration has gained a great interest for its suitability within heavy load lifting and transportation in extreme high temperature and altitude, and other harsh environments. The paper presents some relevant features related to synchropter's flight dynamics modelling of the interference between its two tilted main rotors. Trim results show the advantage of the synchropter in forward flight where the yawing moment is naturally balanced at almost all speeds and no lateral-directional compensation is needed. The synchropter's dynamic stability shows similarity to a conventional helicopter in the longitudinal phugoid. However, in the lateral phugoid, the synchropter is unstable at all flying speeds and therefore its vertical fin needs to be carefully designed.

中文翻译：

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同步飞行器的建模和动力学分析


本文讨论了啮合旋翼直升机（表示为同步飞行器）的飞行动力学建模、配平和动力学分析。这种配置因其适用于极端高温和高海拔以及其他恶劣环境中的重物起重和运输而受到极大的关注。该论文介绍了与同步翼飞行器对其两个倾斜主旋翼之间干扰的飞行动力学建模相关的一些相关特征。配平结果显示了同步器在向前飞行中的优势，其中偏航力矩在几乎所有速度下都是自然平衡的，不需要横向补偿。同步飞行器的动态稳定性显示出与传统直升机的纵向 phugoid 相似之处。然而，在横向 phugoid 中，同步翼在所有飞行速度下都不稳定，因此需要仔细设计其垂直鳍。