I didnt understand what's the radiator for(at the DG, too). can you exlplain?
it keeps the spacecraft cool by radiating thermal/IR radiation into space.
Remember that there is no air in space, that could cool the spacecraft. For preventing that the sunlight cooks the crew (and computers), all spacecraft are isolated and reflect most radiation from the sun away. Now, astronauts and all electrical systems also produce heat, that has to be transported away. The only long-term way to do that in space is by radiation, and that is what the radiators do.
On the Shuttle, the radiators are deployed with the payload bay doors, but if you need more cooling, you can deploy the forward radiators by rotating them away from the doors again and let them use both upper and lower side of them for cooling.
you didnt explain clearly, how exactly control the doors? it isnt connect with the radiator or the antena, right?
All mechanical systems in the Shuttle (= which are operated by a strong AC electromotor) use essentially the same procedure for operating them.
First, you activate power to the motor control assembly (MCA, each a large black box with many large and small relays) for example by the mechanical system switch. Then you decide in which direction the motor should turn (Open/Close). This switch sends a small logic signal to the motor control assembly, which then configures AC relays and connects power from an AC bus to the motor. There are about 20 MCAs in the Space Shuttle, each controlling multiple actuators (the "muscles" in the Space shuttle). Most of them are invisible inside the shuttle, operating valves. Only a small number is visible.
Every mechanical actuator in the Shuttle has two motors that work together on a common gear box. Each motor gets its electricity from a different AC bus and gets controlled by a different MCA. Once the payload bay doors are fully opened, small switches at the mechanics are closed and send a signal back to the MCAs, which then remove power from the motors again, stopping the motion before you accidentally overheat the motors.
On the real shuttle, you would also first have to unlatch the doors (they are locked close by many hooks so they are not ripped off during launch and landing), but the default Atlantis and Shuttle Fleet are simplified there, only SSU handles it currently.
Once the doors are opened, you can unlatch the forward radiators and deploy them if needed.
Also, you can deploy the Ku Band antenna. The Ku Band antenna could also be deployed when the doors are closed on the real Shuttle... bad bad bad idea, this can cause a small explosion and fire near the crew cabin. Always check that the doors are correctly opened before operating the Ku Band deploy motors or activating the antenna gimbals.
So, what do you do now?
First you check that all switches are in the position that they should have had before launch. Short: All disabled, all stopped, all indications are closed.
Then you activate power for the payload bay door mechanic systems (PL BAY DOOR SYS1 & SYS2 - ENABLE).
Now you check if the door indicators are still showing "CL" or closed. If not, call mama (mission control)
Then you flip the switch for the payload bay door actuators to open (PL BAY DOOR - OPEN) and keep it there until all indications are fine and the doors have opened. This should take you about 2x20 seconds for the center line latches, 30 seconds for the forward and aft latches and 63 seconds for each door to open. (The default Atlantis only simulates the 63 seconds for the doors) A lot of time to pass, use a timer there for not missing it.
If all has opened or more twice the expected time has passed, flip the PL BAY DOOR switch to STOP again. If door not open, call mama.
For deploying radiators and Ku band antenna, you need to activate the PL BAY MECH PWR, this is for mechanism inside the payload bay, that can only be used once the doors are opened.
For the radiators, first unlatch them (hold switch in position) then deploy them. Reverse for stowing the radiators: First stow the radiator, then latch it.
Ku band antenna is simply "DEPLOY" until deployed and back to GND.
DIRECT STOW is used in emergencies, when the normal stow operation malfunctions. This uses a bit more convincing force and does not try to rotate the antenna into the orientation for stowing first. (You need to do an EVA first to rotate the antenna back into place, should it be impossible to stow it that way)
(Source:
http://www.nasa.gov/centers/johnson/pdf/567074main_PI_135_F.pdf )
& I still dont know how to get the shuttle to orbit. I need the apoapsis in front of me, but how? the flight vector still keep to go downward, until it pass the horizon line & thats it, im lost & I really disappointed NASA... help please
First of all: Don't launch too steep. The Shuttle needs horizontal velocity and vertical velocity in a very narrow corridor, when the SRBs separate.
Next: Watch the launch replay first to learn how it should be done (approximatly).
The real shuttle does actually drop a few kilometers during ascent after SRB separation again before it becomes fast enough to gain altitude again. That is not automatically bad. It should just not be too much, stay above 95 km altitude if possible.
The Shuttle has only VERY little tolerance for errors, even the Orbiter default one, that has a lot of performance margin more than the real one. You not only have to be able to fly into orbit with a DG to pilot this one, you have to be very efficient. No guessing, but a feeling of what the spacecraft really needs as input to fly you into space.
Try to get a Shuttle Fleet copy from somebody, who still has decentral backup, if you need an reliable autopilot and don't want to learn how to install SSU and use it. SSU is not for beginners and the learning curve is not just steep - it is hyperbolic.