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Default WGS-4 atop Delta IV, January 19 2012
by IronRain 01-19-2012, 01:31 PM

After nearly five years of construction and testing, the U.S. military's next satellite with voluminous throughput to pump vital communications to battlefield forces awaits blastoff Thursday night from Cape Canaveral.

"The team is focused on mission success and getting this critical capability to the warfighter by launching the most advanced wideband satellite system in the world," said Dave Madden, director of the Military Satellite Communications Systems Directorate at the Air Force's Space and Missile Systems Center.

The Wideband Global SATCOM 4 spacecraft, built by The Boeing Company under a $464 million contract signed in 2006, will beam high-data-rate, large-volume communications such as voice, video conferencing, intelligence files and weather information to troops across the Middle East and Southwest Asia, plus supply the bandwidth for routing telemetry and data streams from unmanned aerial drones.

The WGS fleet is the Defense Department's highest capacity communications satellites, employing advanced technology to improve the the capability 10 times over the previous spacecraft constellation.
This will be the Air Force's first military communications satellite launch since its Advanced Extremely High Frequency 1 spacecraft was carried aloft in August 2010 only to experience a major problem when the main propulsion system failed to operate because of debris clogging the fuel lines.

The WGS 4 will be launched atop of a Delta IV M+ (5,4). This version of the Delta IV features a 5 meter diameter fairing and 4 solid rocket motors.




(Delta IV in de Medium+ configuration during the WGS 3 launch campaign)

Lift-off is scheduled for 7:38 (00:38 UTC) with a windows extending through 9:11 p.m. EST (02:11 UTC).

Calendar event: http://www.orbiter-forum.com/calenda...=2012-1-20&c=1 (thanks Orb)



Last edited by IronRain; 01-24-2012 at 09:20 AM.
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Old 01-19-2012, 02:05 PM   #3
SiberianTiger
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Will they cut the webcast after fairing sep, as with all recent classified launches?
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Old 01-19-2012, 02:51 PM   #4
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Quote:
Originally Posted by SiberianTiger View Post
 Will they cut the webcast after fairing sep, as with all recent classified launches?
Nope (this is not as classified as the NRO satellites, given that it's owned by the USAF). For the first three WGS launches, the webcast last all the way to S/C separation.
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Old 01-19-2012, 02:53 PM   #5
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Florida Today - The Flame Trench: Delta IV aims for launch tonight
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Old 01-19-2012, 02:57 PM   #6
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Quote:
Originally Posted by Galactic Penguin SST View Post
 Nope (this is not as classified as the NRO satellites, given that it's owned by the USAF). For the first three WGS launches, the webcast last all the way to S/C separation.
Probably, there's just nothing to fugure out by a standard box shape of the satellite or its ascent profile.
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Old 01-19-2012, 03:46 PM   #7
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Tower rollback is underway to reveal the 217-foot-tall Delta 4 rocket for flight.

Live stream: http://www.livestream.com/spaceflightnow
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Old 01-19-2012, 05:28 PM   #8
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The skies are clear and crisp as the weather looks perfect for launching the Delta 4 rocket tonight. The outlook for the liftoff time still predicts a 95 percent chance of acceptable conditions.

"Cold front moved through late yesterday. Surface high pressure will build in and settle across central Florida providing favorable conditions today. Winds this morning will be northwest at the 10-15 knots and will gradually decrease during the countdown while shifting to the east-northeast by this afternoon and evening," the Air Force weather team says.

"Ground winds will continue to be the only area of slight concern during the countdown and launch window. A few marine stratocumulus clouds could move onshore during the day but will not be a concern. Winds aloft will generally be westerly with maximum speeds approaching 100 knots with no areas of significant shear anticipated."

During this evening's window, the forecast calls for a few low clouds, east-northeasterly winds of 8 peaking to 12 knots and a temperature around 60 degrees F.

In the event of a 24-hour delay to Friday, the odds of good weather are 90 percent favorable, then 80 percent "go" on Saturday.
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Old 01-19-2012, 07:03 PM   #9
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Apparently, WGS is a Boeing 702 and is included in this pack by istochnikov:
Commercial Satellites: Part One: The BOEING 702


If you used Artlav's SC3 to dll converter:
http://www.orbithangar.com/search_qu...x=0&submit.y=0

you could make it into a payload (albeit lacking its ion propulsion) for use on the latest Delta IV Launch Vehicles 3.0, which came out just in time:
Delta IV Launch Vehicles 3.0


so that one could simulate this mission in Orbiter in real time
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Old 01-19-2012, 07:14 PM   #10
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You don't need the converter, you just need to creat a *.cfg that points to the spacecraft 3 file. Give me a couple of minutes..
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Old 01-19-2012, 07:38 PM   #11
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See the attached files.

Place the Delta IV M 5.4 - WGS-4.scn in your scenario's folder
Place the WGS.txt in your config>vessel folder and change the extension to .cfg

You need the
Delta IV Launch Vehicles 3.0
and
Commercial Satellites: Part One: The BOEING 702
add-ons
Attached Files
File Type: scn Delta IV M 5.4 - WGS-4.scn (1.4 KB, 30 views)
File Type: txt WGS.txt (86 Bytes, 47 views)
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Old 01-19-2012, 08:00 PM   #12
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Thanks.
I've always had difficulty with SC3 and either velcro rockets or Delta IV, so I'll take a look at this later.

Looking at the mission literature, despite my comments in the Delta IV 3.0 thread, since they expect an inclination of 24 degrees at SECO, it looks like they DO incorporate a little plane change into the launch...
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Old 01-19-2012, 10:10 PM   #13
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Florida Today - The Flame Trench: Delta IV being fueled for 7:38 p.m. liftoff

Spaceflight Now:
Quote:
2201 GMT (5:01 p.m. EST)
A status check of the fueling activities shows the fast-fill loading to the upper stage liquid hydrogen tank just ended. The launch team continues to load the liquid oxygen supply to the stage.


2149 GMT (4:49 p.m. EST)
Post-filling tests on the first stage liquid oxygen system are complete and the tank is being put into a stable topping mode.


2145 GMT (4:45 p.m. EST)
The upper stage conditioning on the liquid oxygen side has finished, so loading of the tank with 4,500 gallons is starting. This is the last of the rocket's four cryogenic supplies to be filled in today's countdown to launch.


2140 GMT (4:40 p.m. EST)
The launch team is actively loading the upper stage's liquid hydrogen tank with 10,000 gallons of propellant for the RL10 engine.
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Old 01-19-2012, 11:30 PM   #14
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NASASpaceflight: LIVE: ULA set to launch Delta IV with the fourth WGS spacecraft


Spaceflight Now:
Quote:
2327 GMT (6:27 p.m. EST)
With the safety system testing conducted satisfactorily, the radio frequency link checks between the rocket and ground now are beginning as the next portion of countdown operations progresses.


2320 GMT (6:20 p.m. EST)
Engineers are conducting the standard evaluation of the Delta 4 rocket's thermal insulation following the loading of supercold propellants into the vehicle.


2316 GMT (6:16 p.m. EST)
Proper flight conditioning of the first stage liquid hydrogen supply has been achieved.


2315 GMT (6:15 p.m. EST)
Pre-launch checks of the Delta 4 rocket's safety system are being performed at this point in the countdown.


2312 GMT (6:12 p.m. EST)
Upper stage liquid oxygen topping has commenced. That puts all four cryogenic fuel tanks aboard the Delta 4 rocket in topping mode.
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Old 01-20-2012, 12:19 AM   #15
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Live coverage has started:
http://www.ulalaunch.com/site/pages/Webcast.shtml
http://www.ulalaunch.com/site/pages/Mobile.shtml
http://www.livestream.com/spaceflightnow
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