Difference between revisions of "Tutorial: Sputnik 1/zh-cn"

Revision as of 08:30, 31 May 2013

欢迎来到本教程的第一课，我们将在这里重现地球太空飞行历史上的一系列重要任务。在阅读本指南之前，你最好能先完成游戏自带的教程，以掌握基本的操作。

我们的第一个任务是“斯普特尼克”的发射，这是第一个进入环绕地球轨道的人造物体。1957 年，苏联成功的发射了“斯普特尼克”，并震惊了整个世界。当美国各军事机构的航天计划能给人留下印象的还是发射场的爆炸“非计划性航天器解体事件”，没有人能够料到苏联人已经在火箭科学中遥遥领先。“斯普特尼克”在太空中发出的“哔哔”声，全世界的业余电台都能接受到这一信号，对于西方航天界而言，它无疑是振聋发聩的巨响，他们从此意识到应该严肃面对太空飞行了。现在，我们就来在 KSP 中重现这一任务。

我们要向太空发射一颗卫星，并让它进入稳定的轨道。就此而言，太空的定义是从 100 km 高度开始的，因为这里的大气层已经稀薄到不至于影响飞行器的地步，因此，飞行器可以于此长久的保持在轨状态。

运载火箭设计

在这个任务中，我们会重新制造苏联的 R7 型火箭。它的第一级由四台发动机组成，第二级为单发动机，卫星是末级负载。

我们的火箭

• 负载端
  • 1x Stayputnik Mk. 2
  • 1x Z-500 充电电池组
• 第二级
  • 1x TR-18A 型级间分离环
  • 1x FL-R25 型 RCS 燃料舱段
  • 4x RV-105 型 RCS 喷嘴单元 (对称形径向安装)
  • 1x FL-T800 型燃料舱段
  • 1x LV-T30 型液体燃料火箭发动机
• 第一级
  • 4x TT-38K 型径向分离机构
  • 4x FL-T400 型燃料舱段
  • 4x 流线形鼻锥
  • 4x LV-T30 型液体燃料火箭发动机

我们在负载级安装了电池组，因为 Stayputnik 组件需要外部能源来运作。在上升段，发动机可以产生电源，但入轨后它就需要自身的电源装置来保持运行。它本身的电源容量为 5 单位，大概只能维持其运行 2 分钟，然后它就是废铁一块了。而 Z-500 可以提供 500 单位的能量，足够在几个完整的轨道周期维持其运转。或许 Z-100 的重量相对更合适，但不幸的是在我们这儿它无法在火箭上正常安装。

When you want your satellite to look more like the real Sputnik, you could also add four radially-mounted Communotron 16 antennas to the round part of the Stayputnik so that they face backwards in a 45° angle. But keep in mind that they don't do anything but making the mission more difficult by adding additional mass and drag to your rocket.

Note that the aerodynamic nose cones are technically just for show, because the current version of KSP (0.18.4) doesn't model atmospheric drag correctly. Any part you add to your rocket will make the drag worse, there is no way to reduce drag by adding more parts. Feel free to omit them when you don't care about aesthetics.

Mission phases

Lift-Off

Before you start your flight, switch on RCS and SAS so you have better control over your rocket. Also, switch your nav-ball from surface-mode to orbit-mode by clicking on the dial above it (it should read "Orbit 174.5m/s").

This phase is about getting out of the atmosphere as quickly as possible. The thick atmosphere around the ground creates drag which costs you fuel, so we will head straight up to get out of it. When you are ready, hold shift to set your throttle to maximum, and ignite your first stage by pressing space. Watch the nav-ball and keep your rocket pointed at the center for a perfectly vertical ascent. When the first stage burnt all its fuel, drop it and ignite the second stage using space (don't press space too often, or you drop your payload).

Gravity-Turn

When you've reached an altitude of 10km (should be shortly after igniting the 2nd stage), air resistance becomes much less. Now we start to build up vertical speed so we get fast enough to get into a stable orbit. Do this by tipping your rocket into the direction of the yellow direction marker on the nav-ball (90° eastwards). While your rocket faces the direction marker, the marker will slowly fall towards the horizon. This is good. Keep your rocket pointed at the direction marker, so it slowly tips towards the horizontal plane.

Getting into a circular orbit

While you perform your gravity turn, switch to the map view so you can see your flight path and you apoapsis. You can switch on the nav-ball in orbital view by pressing the comma-key on the num-pad. Do this so you don't get off-course. Your goal now is to get your apoapsis to about 100km. We need some additional height because we aren't out of the atmosphere yet, so we will keep losing some height due to atmospheric drag.

When you reached your apoapsis, perform a prograde boost - orient your rocket horizontal in eastern direction and burn your remaining fuel to get into a circular orbit. Should you run out of fuel, remember that you likely still have plenty of monopropellant left from the ascend. Press H to use it to accelerate forward. It doesn't do much, but it can be enough to give you the crucial last few m/s to get into a stable orbit.

Dropping the payload

After you are in orbit, drop your payload using space. Thanks to the powerful separator it will be blasted forward while the engine stage drifts behind. Congratulation, you just made space history. Go into time-warp and watch your satellite orbit Kerbin gracefully.

What next?

A scientific satellite in orbit

Unfortunately the satellite still has a limited lifetime due to energy use. To extend its life further it needs some kind of energy source in form of photovoltaic panels or a Radioisotope generator. When you have a sustainable energy supply, you can also add some scientific payload like accelerometer, barometer, thermometer or gravimeter. Note that all of this will increase weight and atmospheric drag, so you will need to add some more tanks to your rocket.

When unmanned satellites become boring, it's time to get to the next stage of space exploration: your first manned mission.