在这种情况下，拍击，像鸟儿一样飞可能比螺旋桨推进飞行要好些。
Under these conditions, flapping, birdlike flight might well have some benefits over propeller-driven or helicopter flight.
目前POD推进器已成为国外螺旋桨推进技术的最新发展趋势。
At present, POD propeller has already become the newest development trend of propelling technology in foreign countries.
以螺旋桨推进为例，介绍“船-桨-机”匹配的目的、思路、步骤和方法。
A Marine propeller propulsion system was first analyzed to describe the objective, clew, and procedure for hull-propeller-engine matching.
当要起飞时只需要将各组件组装一起后将飞机扔向空中，它通过携带的电动螺旋桨推进器升上天空。
Launching it is just a matter of snapping the parts together and throwing it into the air, whence it is carried aloft by an electric propeller.
只需按一个按钮，15秒钟的时间，翅膀就会自动地折叠起来，动力就会从螺旋桨推进器切换到后轮。
At the touch of a button it takes just 15 seconds for the wings to fold up automatically and the power to be re-routed from the propeller to the rear wheels.
气垫船动力系统增加了为气垫供气用的垫升风机，同时采用空气螺旋桨推进，整个动力系统设计复杂。
With lift fans for air supply and aerial propellers in propulsion simultaneity, the whole power system of Air-Cushion Vehicle becomes more complicated.
它们使用的操纵和控制系统大多是由多个螺旋桨推进器组成的，这样的系统体积大、重量大、能耗高、综合效率低，并有较大的噪音和尾涡。
Their maneuvering and control systems are made up of several propellers. This system has many disadvantages such as big volume, high consuming of energy, low total efficiency , high noise and vortex.
立方直升机的这种配置让他可以像直升机一样盘旋，但在向前飞行时，主旋翼的转速可以将下来，让两侧的机翼提供升力，在此情况下，两台螺旋桨推进器就能发挥大作用了。
This means it can hover like a helicopter, but when flying forwards can reduce the speed of the main rotor and let the wings provide part of the lift. Its propellers give the extra oomph.
在中国船舶科学研究中心拖曳水池中，通过滑行艇模型自航试验，研究了艇底气层对滑行艇推进性能的影响，结果表明：气层对采用水螺旋桨推进的滑行艇推进性能的影响不大。
The effect of bubbly layer on propulsion performance of planing craft is investigated by means of self-propelled model experiment in the towing tank of China Ship Scientific Research Center.
推进器是由火箭发动机提供的，而不是螺旋桨和方向舵，这使得转向变得困难。
Propulsion is provided by a rocket engine, rather than a propeller and rudder, which makes steering difficult.
美国西科斯基公司的X2拥有一部安装在后方的推进螺旋桨，这使它获得高速的前飞速度。
The Sikorsky X2 has a pusher propeller mounted at the rear to obtain its high forward speed.
大多数使用电力驱动的螺旋桨和推进器进行操纵。
Most use electrically driven propellers or thrusters to manoeuvre.
它使用一个安装在后面的推进式螺旋桨并有一对一上一下反向旋转的主旋翼。
The X2 uses a pusher propeller mounted at the rear and has a pair of contra-rotating main rotors, one positioned above the other.
双螺旋桨在向前推进时向内旋还是外旋？
认为以满足螺旋桨额定推力为目的，推进电动机只需要低速输出额定转矩来实现，即输出功率较低。
In order to satisfy the operation requirement of the rated thrust of the propeller, the propulsion motor performs only in rated torque on the low speed, so the motor power is low.
本船推进系统由1 台位于艉部机舱内的低速柴油机和一个定距螺旋桨以及轴系组成。
The vessel is to be single fixed pitch propeller propulsion with one (1) low speed diesel engine located aft.
这些坦克车下截设有不透水帆布围裙，以便漂浮，并特设螺旋桨，以便向海滩推进，登陆之后即可照正常操作。
Equipped to float with impermeable canvas skirts, these tanks were to propel themselves to the beach with an AD hoc propellor and then resume normal operation.
因此研究螺旋桨负载特性对于深入认识电力推进装置的特点有很重要的意义。
So there is much important significance to deeply understanding the characteristic of electric propulsion device by studying the performance of a propeller load.
文中亦对特殊船尾的推进性能与螺旋桨设计作了初步分析。
The propulsive performance and design of propeller for the special stern shapes are discussed in this paper.
建议在多工况船的螺旋桨设计中采用二档变转速推进方式。
Therefore, it is recommended to adopt the two-step change-speed propeller in the tug design.
人们很容易适应斯特林发动机船，但推进力是低于螺旋桨。
It is easy to adapt to the Stirling engine boat, but the propulsive force is lower than that of the screw propeller.
空气螺旋桨是把航空发动机的动力转化为飞行器推进力的工具。
Air propeller is the tool which transforms the power of aerial engine to the thrust of aircraft.
船用螺旋桨是一类典型的自由曲面零件，它的设计和制造精度直接决定了其推进效率。
Marine propeller is a type of free form surface part. Its design and manufacture precision decide ship's thrust efficiency directly.
根据我国航道条件就现有浅水拖输艏艉线型形状进行了探讨，从阻力和推进观点出发对满载水线、横剖面形状、半进水角和各种坠洞以及它们对螺旋桨的影响等加以分析、比较。
In view of the resistance and propulsion, the load water line, shape of sections, half Angle of entrance, forms of tunnel and their effect on propeller were analysed and compared.
通过WVIS -ME45隔振器的轴向弹性变形来传递螺旋桨的推力，有效地控制了船舶推进系统的振动和噪声。
It is efficient to control the vibration and noise of the propulsion system since the thrust is transmitted by axial elastic deformation of WVIS-ME45 vibration isolator.
螺旋桨作为推进器在电力推进系统中占有重要地位。
The propeller takes much important place in the electric propulsion system.
用面元法对吊舱螺旋桨的水动力性能进行了计算，得到了吊舱推进器的敞水曲线和轴承力。
The hydrodynamic performance of podded propeller is calculated, including the open water characteristics and bearing force.
ZT J系列螺旋桨是推进器用于制浆造纸工业作为卧式浆池的循环搅拌装置。以使纤维保持悬浮状态，保持纸浆的组成部分在浆料中均匀分布。
ZTJ series of Screw Propeller are used as cycle stirring devices for lying pulp and paper making industry to keep fiber in suspension and also well-distributed.
ZT J系列螺旋桨是推进器用于制浆造纸工业作为卧式浆池的循环搅拌装置。以使纤维保持悬浮状态，保持纸浆的组成部分在浆料中均匀分布。
ZTJ series of Screw Propeller are used as cycle stirring devices for lying pulp and paper making industry to keep fiber in suspension and also well-distributed.
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