What that is, is the fastest speed that you can fly, have full deflection of your control surfaces, and not structurally damage the aircraft.

那是你能飞行的最快速度，控制面完全偏转的同时不会损坏飞机的结构。

Also, because it's a control surface, it's more likely to have markings, maybe maintenance markings or serial numbers that can tie it to the plane.

另外，由于这是块控制面，所以上面很可能有记号，可能有可以确定飞机信息的维修记号或是编号。

They began by building a wind tunnel in their workshop in Dayton, which allowed them to test the aerodynamics of different wing designs and control surfaces.

他们首先在代顿的车间建造了一个风洞，这使他们能够测试不同机翼设计和控制面的空气动力学特性。

Although four-engine operation would be more efficient, upgrading the airframe to run with only four engines would necessitate further alterations to the aircraft's systems and control surfaces especially the rudder, extending the project's duration, cost, and complexity.

尽管四引擎运行效率更高，但将机身升级为仅使用四引擎运行将需要对飞机的系统和控制面（尤其是方向舵）进行进一步改造，从而延长了项目的持续时间、成本和复杂性。