Firefly DREAM Mission更新

由于字数过于长，动态放不下，所以就放专栏了。

Firefly在6号凌晨放出了一段视频，但该视频很快被删除，该视频被网友很快下载了下来并重新上传。同时该视频的描述附上了有关这次任务失败的更多细节。

UP现已更新至P3:

（更新：Firefly已上传完整视频，现已更新到1P，后面的顺延）

新视频显示了有一台发动机在火箭升空后不久即关闭，随后多次尝试重启失败，从而导致火箭在MAX-Q附近姿态出现异常，激活了FTS，发生爆炸。并表示发动机没有发生故障，只是推进剂阀门关闭。（推测可能是软件问题或连接到发动机的阀门出现故障）。

以下是视频描述内容：

Firefly conducted the first flight test of our Alpha vehicle on September 2, 2021. Although the vehicle did not make it to orbit, the day marked a major advancement for the Firefly team, as we demonstrated that we "arrived" as a company capable of building and launching rockets. We also acquired a wealth of flight data that will greatly enhance the likelihood of Alpha achieving orbit during its second flight. In short, we had a very successful first flight.

Here are a few specific notes about the flight:

The vehicle released and cleared the pad correctly. The various connections and moving mechanisms connected to the rocket all worked correctly. The vehicle controlled itself perfectly off the pad, with thrust vectoring eliminating all tipping or rotation, and the vehicle increased in speed at the exact rate that was predicted in modelling.

About 15 seconds into the flight, engine 2 (there are four Reaver engines on the first stage) shut down. It was an uneventful shutdown – the engine didn't fail -- the propellant main valves on the engine simply closed and thrust terminated from engine 2.

The vehicle continued to climb and maintain control for a total of about 145 seconds, whereas nominal first stage burn duration is about 165 seconds. However, due to missing the thrust of 1 of 4 engines the climb rate was slow, and the vehicle was challenged to maintain control without the thrust vectoring of engine 2. Alpha was able to compensate at subsonic speeds, but as it moved through transonic and into supersonic flight, where control is most challenging, the three engine thrust vector control was insufficient and the vehicle tumbled out of control. The range terminated the flight using the explosive Flight Termination System (FTS). The rocket did not explode on its own.

Firefly has commenced a thorough anomaly investigation to gain understanding of why engine 2 shutdown early, and uncover any other relevant unexpected events during flight. We will report root cause of the anomaly at the end of this investigation. In collaboration with the FAA and our partners at Space Launch Delta 30, we will return to conduct the second Alpha flight as soon as possible.

This video montage shows the entire mission from a variety of camera angles. Enjoy.

翻译（Google机翻）：

Firefly 于 2021 年 9 月 2 日对我们的 Alpha 飞行器进行了首次飞行测试。尽管飞行器没有进入轨道，但这一天标志着 Firefly 团队取得了重大进展，正如我们所展示的 我们“到达”是一家能够制造和发射火箭的公司。 我们还获得了大量的飞行数据，这将大大提高阿尔法在第二次飞行中进入轨道的可能性。 简而言之，我们的首飞非常成功。

以下是有关飞行的一些具体说明：

车辆正确释放并清除了垫子。 连接到火箭的各种连接和移动机构都正常工作。 车辆完全脱离垫板进行自我控制，推力矢量消除了所有倾斜或旋转，并且车辆以建模中预测的准确速率增加了速度。 飞行大约 15 秒后，2 号发动机（第一级有四个 Reaver 发动机）关闭。 这是一次平稳的停机——发动机没有发生故障——发动机上的推进剂主阀只是关闭，推力从发动机 2 终止。

车辆继续爬升并保持控制总共约 145 秒，而标称的第一阶段燃烧持续时间约为 165 秒。 然而，由于缺少 4 个发动机中的 1 个的推力，爬升率很慢，并且在没有发动机 2 的推力矢量的情况下，飞行器面临着保持控制的挑战。Alpha 能够以亚音速进行补偿，但是当它通过跨音速和 进入超音速飞行，控制是最困难的，三引擎推力矢量控制不足，飞行器失控翻滚。 该范围使用爆炸性飞行终止系统（FTS）终止飞行。 火箭并没有自行爆炸。 

Firefly 已开始彻底的异常调查，以了解发动机 2 提前关闭的原因，并发现飞行过程中的任何其他相关意外事件。 我们将在调查结束时报告异常的根本原因。 与 FAA 和我们在 Space Launch Delta 30 的合作伙伴合作，我们将尽快返回进行第二次 Alpha 飞行。

该视频蒙太奇从各种摄像机角度展示了整个任务。 享受。