英语翻译However,there is an undesirable result from this flappin

英语翻译
However,there is an undesirable result from this flapping action which can be overcome through use of the cyclic pitch control.As the advancing blade flaps upward it reaches its highest flapped position directly in front,one-quarter of a revolution from the point where the increased lift began to take effect.Conversely,the retreating blade reaches its lowest flapped position directly to the rear,over the tail of the helicopter.Therefore the tendency of the aircraft to roll,eliminated by the flapping of the blades,is now changed to a tendency for the rotor disc to pitch to the rear and thus for the helicopter to climb as it goes into forward flight.This might seem to call for still more complications in the control system,but fortunately this is not the case.To start the ship moving forward initially,the pilot had pushed his cyclic stick forward.To overcome the climbing tendency he simply pushes the stick still farther forward,responding naturally to the nose-up position,and the rotor disc remains in the desired attitude.
One of the important characteristics of lift dissymmetry is that it becomes much worse as the helicopter speeds up and flies faster.Since the lift on the blades on the advancing side cannot be permitted to exceed the lift on the retreating side,this factor tends to limit the top speed at which the fastest helicopters (with conventional rotor systems) can fly; for even the largest and most powerfully-engined of helicopters,at speeds just above 200 miles per hour the lifting and propelling characteristics of the rotor are affected,and a phenomenon termed "blade stall" is encountered.*
With these primary controls pedals for steering,the collective pitch stick (with the twist throttle),and the cyclic stick the pilot can move his ship in any direction,turning it around on the axis of the main rotor,moving it up,down,forward,to the rear,and sideways.Obviously,a helicopter pilot can be very busy indeed.Each hand and both feet may be at work at the same time,and the pilot's left hand will have two jobs to do simultaneously,pulling up on the pitch stick while feeding in power with the throttle.Added to this is the fact that most copters do not possess the inherent stability found in airplanes,being in this respect more comparable to an automobile than an airplane; you can't let go of the controls for more than a few seconds at a time.But these seemingly complicated motions are easily absorbed,and a natural pattern of action and reaction is quickly established by most student pilots.

However, there is an undesirable result from this flapping action which can be overcome
然而,由拍打动作产生一个不希望看到的结果,这可以通过采用控制旋转斜度来克服
through use of the cyclic pitch control. As the advancing blade flaps upward it reaches its
当推进叶片向上摆动并达到
highest flapped position directly in front, one-quarter of a revolution from the point where the
前方最高摆动位置时,从此点转动四分之一的位置,增加的升力开始产生作用
increased lift began to take effect. Conversely, the retreating blade reaches its lowest flapped
相反地,下摆的叶片达到后面直升机尾部上方最低的摆动位置.
position directly to the rear, over the tail of the helicopter. Therefore the tendency of the
因此,飞行器翻滚的倾向,
aircraft to roll, eliminated by the flapping of the blades, is now changed to a tendency for the
被叶片的拍打消除掉,现在变成一种旋转盘向后倾斜的倾向
rotor disc to pitch to the rear and thus for the helicopter to climb as it goes into forward flight.
从而使直升机爬升,就像向前飞行.
This might seem to call for still more complications in the control system, but fortunately this is
这似乎看起来还要求控制系统内更加复杂,但幸运地是,这不是这种情况.
not the case. To start the ship moving forward initially, the pilot had pushed his cyclic stick
为了使机身开始向前运动,飞行员向前推动转动操作杆.
forward. To overcome the climbing tendency he simply pushes the stick still farther forward,
为克服爬升倾向,他只需要继续向前推操作杆,
responding naturally to the nose-up position, and the rotor disc remains in the desired attitude.
自然而然地达到相应的爬升位置,旋转盘保持着期望的态势.
One of the important characteristics of lift dissymmetry is that it becomes much worse as the
爬升不对称的重要的特征之一就是当直升机加速并飞的更快时,这种不对称会变得更差.
helicopter speeds up and flies faster. Since the lift on the blades on the advancing side cannot
由于向前的一侧的叶片上的爬升力不允许超过相反一侧的爬升力,
be permitted to exceed the lift on the retreating side, this factor tends to limit the top speed at
此因素导致能飞的嘴快的直升机的最高速度受到限制；
which the fastest helicopters (with conventional rotor systems) can fly; for even the largest and
即使对于装备了最大最强发动机的直升机来说,
most powerfully-engined of helicopters, at speeds just above 200 miles per hour the lifting and
在速度刚刚超过每小时200英里时,旋转体的爬升及推进特征会受到影响,
propelling characteristics of the rotor are affected, and a phenomenon termed "blade stall" is encountered.*
并且会碰到一种术语上叫做“叶片停转”的现象.
With these primary controls pedals for steering, the collective pitch stick (with the twist
装备这些主要的操纵控制踏板,集成斜度操纵杆（带有转动调节）,
throttle), and the cyclic stick the pilot can move his ship in any direction, turning it around on
轮盘式操纵杆,飞行员可以使他的飞机在任意方向移动,绕主旋转体的轴心转动,
the axis of the main rotor, moving it up, down, forward, to the rear, and sideways. Obviously, a
向上,向下,前进,后退,侧移.很明显,
helicopter pilot can be very busy indeed. Each hand and both feet may be at work at the same
直升机飞行员会非常忙碌.每只手机双脚可能同时工作,
time, and the pilot's left hand will have two jobs to do simultaneously, pulling up on the pitch
飞行员的左手将同时有两种工作要做,拉起倾斜操纵杆,同时用调节器来增加动力.
stick while feeding in power with the throttle. Added to this is the fact that most copters do not
增加此动作,事实上多数的直升机并不具有飞机的固有稳定性,
possess the inherent stability found in airplanes, being in this respect more comparable to an
在此方面汽车比飞机更具有可比性；
automobile than an airplane; you can't let go of the controls for more than a few seconds at a
你对飞机释放控制一次不能超过几秒钟.
time. But these seemingly complicated motions are easily absorbed, and a natural pattern of
但这些表面上看起来复杂的动作很容易的操作,
action and reaction is quickly established by most student pilots.
并且动作及反应的较为自然的模式会被多数的飞行学员很快的接受.