To the level of a pilot capable of performing the beyond the basics of Inverted Flight.
第四级属于高级程度，使操控者有能力执行基础的倒飞动作。
All aerobatic figures start and end from horizontal lines in either upright or inverted flight.
所有的特技飞行动作无论是正飞还是倒飞都由水平方向开始和结束。
You push forward and fly the second half of an outside loop till you are in horizontal inverted flight.
你先向前飞，在后半部分做一个外侧筋斗，直到你进入水平倒飞。
The team used simulation tools to show it was possible to achieve over-land flight by dramatically lowering the level of sonic booms through the use of an "inverted-V" engine-under wing configuration.
这个团队在其所设计的飞机模型中在引擎上方使用了一个“倒V字型”的结构，他们通过模拟工具展示了通过这个结构可戏剧性地减少音爆导致的噪声成为一种可能。
Starting from an altitude of no less than twenty (20) meters and on a heading parallel to the flight line, with the helicopter inverted and to the pilot right, start your Autorotation.
机头保持与航道平行，且高度不得低于20公尺，直升机保持倒飞姿态，向操控者的右侧开始执行熄火降落。
So the researching on the inverted pendulum is of important practice meaning to the high technology such as the rocket flight and the controlling of the robot.
因此，倒立摆的研究对于火箭飞行以及机器人的控制等现代高新技术的研究具有重要的实践意义。
The helicopter, rocket flight, man-made satellite running, robot's weight lifting, doing gymnastics and hoofing are all similar to the stable controlling of the inverted pendulum system.
直升飞机、火箭飞行、人造卫星的运行、机器人的举重、做体操、及机器人的行走都存在有类似于倒立摆系统稳定控制相似问题。
The aerodynamic characteristics of a tethered balloon with inverted "Y" fins were estimated by the traditional aerodynamic estimation from the flight dynamics analysis viewpoint.
从飞行力学分析的角度 ，用传统的气动力估算方式对具有倒“Y”型尾翼的系缆气球的气动力特性进行估算 。
The aerodynamic characteristics of a tethered balloon with inverted "Y" fins were estimated by the traditional aerodynamic estimation from the flight dynamics analysis viewpoint.
从飞行力学分析的角度 ，用传统的气动力估算方式对具有倒“Y”型尾翼的系缆气球的气动力特性进行估算 。
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