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2020 LTS Keflavik news post draft: Difference between revisions
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2020 LTS Keflavik news post draft (view source)
Revision as of 14:59, 7 November 2020
, 7 November 2020→Space Shuttle
Legoboyvdlp (talk | contribs) (→A320) |
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Last Shutte Stable release was end of the year 2019, next one might be for the end of the present year. | Last Shutte Stable release was end of the year 2019, next one might be for the end of the present year. | ||
Meanwhile, [https://sourceforge.net/p/fgspaceshuttledev/code/ci/development/tree/ the dev branch] is fully usable and will be compatible with the 2020.3, with some really nice improvements. | Meanwhile, [https://sourceforge.net/p/fgspaceshuttledev/code/ci/development/tree/ the dev branch] is fully usable and will be compatible with the 2020.3, with some really nice improvements. | ||
Some of the new things are detailled below. | |||
For a more extensive review and explanations of the differents points below, you can have a look there: [https://forum.flightgear.org/viewtopic.php?f=87&t=36618 Space Shuttle-Release and Dev Change Log] | However, ''it does require already a good knowledge of how the Shuttle works in the stable branch'' as many features and troubleshooting procedures are not detailled yet in the [http://www.science-and-fiction.org/downloads/flight_manual_basic.pdf.gz FG Shuttle manual]. | ||
Some of the new things that you can find in that branch are detailled below. | |||
For a more extensive review and explanations of the differents points below, you can have a look there: '''''[https://forum.flightgear.org/viewtopic.php?f=87&t=36618 Space Shuttle-Release and Dev Change Log]''''' | |||
*Brand new Florida area thanks to Legoboyvdlp: [https://github.com/legoboyvdlp/Florida-fg-CustomScenery Florida CustomScenery] | *Brand new Florida area thanks to Legoboyvdlp: [https://github.com/legoboyvdlp/Florida-fg-CustomScenery Florida CustomScenery] | ||
The "official" launch area of the Shuttle had a really nice visual upgrade. When looking from an exterior point of view, immersion is greatly improved. | |||
[[http://wiki.flightgear.org/File:Sunrise_Cap_High_altitude.jpg Global view of the Cape at Sunrise]] | [[http://wiki.flightgear.org/File:Sunrise_Cap_High_altitude.jpg Global view of the Cape at Sunrise]] | ||
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*Hubble Rendez Vous // Payload Grapple and Retrieval | *Hubble Rendez Vous // Payload Grapple and Retrieval | ||
Until now, it was already possible to perform some rendez vous to [https://forum.flightgear.org/viewtopic.php?f=19&t=35535 ISS], following close to real procedures. It is now doable towards other objects, especially [https://forum.flightgear.org/viewtopic.php?f=87&t=36311 Hubble]. | |||
A very rewarding challenge, as it pushes the Shuttle operations to their limits propellant wise. | |||
Payload can be grappled again after being released from the payload bay, a game of patience which in real took hours with several detailled and time consuming procedures. | |||
[http://wiki.flightgear.org/File:Hubble_dev_1.jpg Hubble ] | [http://wiki.flightgear.org/File:Hubble_dev_1.jpg Hubble ] | ||
*Eileen (Famous Shuttle Commander) is here now to assist us in Station Keeping task while working on RMS operations or messing around | |||
*Eileen Copilot ([https://en.wikipedia.org/wiki/Eileen_Collins Famous Shuttle Commander]) | |||
Eileen is a kind of IA here now to assist us in Station Keeping task while working on RMS operations or messing around. She is particularly useful when working on a satelite to grapple. | |||
[[http://wiki.flightgear.org/File:Eileen_dev_1.jpg CoPilot Assistance for Station Keeping]] | [[http://wiki.flightgear.org/File:Eileen_dev_1.jpg CoPilot Assistance for Station Keeping]] | ||
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*Performance improvements on SSME and Launch Autopilot | *Performance improvements on SSME and Launch Autopilot | ||
Space Shuttle Main Engine thrust,[https://en.wikipedia.org/wiki/Specific_impulse ISP] , and consumption is now within a percent of the real datas. | |||
The mixture ratio in real was around 6, and it is what we observe in the sim (6 times more liquid Oxygen burnt than liquid Hydrogen). Hence, Main Engine Cut Off ( MECO) time is matching real one. Plus, the propellant remaining at MECO, called the Final Performance Reserve (FPR) is now within a percent ( 15000 pounds). It makes launch with high payload into a high inclination Orbit (towards ISS typically) really interesting and limitating performance wise, like in real. | |||
An interesting read about that FPR, written by a former Shuttle Flight Controller: [https://waynehale.wordpress.com/2014/10/08/understanding-sts-93-the-key-is-mixture-ratio/ Wayne Hale: The key is Mixture Ratio] | |||
You can find below some in sim datas compared to real one coming from the Shuttle Crew Operations Manual (SCOM). | |||
[[http://wiki.flightgear.org/File:Stage_1_in_sim.png Velocity Vs Time in Sim] [[http://wiki.flightgear.org/File:Stage_1_scom.jpg Velocity Vs Time in real]] | |||
[[http://wiki.flightgear.org/File: | [[http://wiki.flightgear.org/File:Stage_2_in_sim.png Altitude Vs Time in Sim]] [[http://wiki.flightgear.org/File:Stage_2_scom.jpg Altitude vs Time in Real]] | ||
[[http://wiki.flightgear.org/File: | |||
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''Helium Subsytem for the Space Shuttle Main Engines'' | ''Helium Subsytem for the Space Shuttle Main Engines'' | ||
[https:// | The Space Shuttle is composed of a tremendous amount of valves and feedlines, going from the External Tank (ET) to the SSME to bring the liquid propellant into the Main Propulsion System (MPS). A lot of those valves are pneumatically actuated, by an inactive gas, Helium. | ||
It allows also to create some inert vacuum in some areas where liquid Hydrogen and liquid Oxygen could be in contact, in the [https://en.wikipedia.org/wiki/RS-25#Oxidizer_system Oxidizer part] of each Engines. | |||
Finally, it is used post MECO to purge the feedlines with remaining propellants ( 5000 pounds ! ). | |||
That system is highly complicated and interesting, with some capacities of Helium crossfeed between engines in case of leak. | |||
More informations there:[https://science.ksc.nasa.gov/shuttle/technology/sts-newsref/sts-mps.html Main Propulsion System Helium Subsystem] | |||
''Caution and Warning | |||
''Caution and Warning System (CWS) improvements'' | |||
[[http://wiki.flightgear.org/File:CW_dev_3.jpg CWS Diagram summary]] | [[http://wiki.flightgear.org/File:CW_dev_3.jpg CWS Diagram summary]] | ||
[https://spaceshuttleguide.com/system/caution_and_warning_system.htm Caution and Warning System guide] | The most visible improvement here is a closer to real fault message logic, announced when a parameter is going high or low. A good example is the electrical buses, with low/high voltage somewhere due to a short circuit. CWS is quite complex in the Shuttle. A lof of different kinds of alarms, depending of the seriousness of the failure. Plus it depends which software is loaded in the computer, the primary one or the fascinating [https://spaceflight.nasa.gov/shuttle/reference/shutref/orbiter/avionics/dps/bfs.html Backup Flight Controller], ie. last level of redundance in case of major computer bug. | ||
A good but dense guide about that system might be found either in the SCOM or there: [https://spaceshuttleguide.com/system/caution_and_warning_system.htm Caution and Warning System guide] | |||
The main fault display page | |||
[http://wiki.flightgear.org/File:Fault_dev_3.jpg Fault summary display] | [http://wiki.flightgear.org/File:Fault_dev_3.jpg Fault summary display] | ||
A quick glance on how it can look with a "simple" shortcut in one of the AC buses. It triggers quite some alarms and messed up a bit everything. Better have a good knowledge of what everyhing mean for a good troubleshooting | |||
[[File:Elec_shortcut_fault_message_v_2.0.jpg Electric short circuit fault messages ]] | |||
*Better Plasma during Entry | *Better Plasma during Entry | ||
While hitting the atmosphere at Mach 25, a orange-ish Plasma glow can be observed around the Shuttle, causing black out and long minutes of sweating. | |||
Hard to observe in real, we can have a look on it [https://www.youtube.com/watch?v=j1vmVJKqUFE here] and [https://www.youtube.com/watch?v=hK1RxQKCmCE there]. | |||
Plasma during the hottest part of the entry, when the Shuttle dives into the atmosphere at Mach 24 and 250 kfeetish. Thermal constraint is there the hard boundary to stay away from. | |||
[http://wiki.flightgear.org/File:Plasma_dev_1.jpg Plasma during entry with Aurora in the background] | [http://wiki.flightgear.org/File:Plasma_dev_1.jpg Plasma during entry with Aurora in the background] | ||
Later in the entry ( below Mach 15), the glow starts to vanish but the belly shield is still under heavy thermal stress; Dark Maul style. | |||
[http://wiki.flightgear.org/File:Entry_Moon_Plasma.jpg Hot shield and Moon] | [http://wiki.flightgear.org/File:Entry_Moon_Plasma.jpg Hot shield and Moon] | ||
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Most of the work is sum up here: [https://forum.flightgear.org/viewtopic.php?f=87&t=37429 Space Shuttle-Display adjustments (PFD,HUD,MEDS,DPS...)]. | Most of the work is sum up here: [https://forum.flightgear.org/viewtopic.php?f=87&t=37429 Space Shuttle-Display adjustments (PFD,HUD,MEDS,DPS...)]. | ||
Already a lot of those are available on the Space Shuttle dev Branch | Already a lot of those are available on the Space Shuttle dev Branch. | ||
By the end of the year, a new layer of immersion should be available with the completion of that interior display rework | The main thing here is to iron the visible part of the iceberg by fine tunning the display realism visual wise. As with the other parts of the Shuttle, it is based on real documentations, mainly the [https://www.nasa.gov/centers/johnson/pdf/359895main_DPS_G_K_7.pdf Data Processing System Dictionnary]. | ||
By the end of the year, a new layer of immersion should be available with the completion of that interior display rework. | |||
Shuttle Cockpit ready for a night launch. | |||
[[http://wiki.flightgear.org/File:Shuttle_Interior_Night_Launch_new_dps.jpg Night Launch Cockpit view]] | [[http://wiki.flightgear.org/File:Shuttle_Interior_Night_Launch_new_dps.jpg Night Launch Cockpit view]] | ||
[[http://wiki.flightgear.org/File:On_Orbit_DPS_overhaul. | |||
Orbit reached, time for another batch of softwares and to raise the Perigee | |||
[[http://wiki.flightgear.org/File:On_Orbit_DPS_overhaul.jpg On Orbit Cockpit View]] | |||
====A320==== | ====A320==== | ||