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Version 1.82
Sortie initiale November 18, 2020
Dernière mise à jour March 05, 2021
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#Real-Life Exclusive

Asobo Cessna Citation Model 700 Longitude Performance and Flight Dynamics Modifications Project Version 1.82
Featuring Optional OnAir Virtual Airline Compatible Installation Package

Please check out the chatter and follow the progress of this project on the offical MSFS 2020 Forum:
https://forums.flightsimulator.com/t/cessna-citation-longitude-flight-dynamics-modification-project

Version 1.82 Changes:

  • Fixes an Asobo bug in the panel configuration files borrowed from the Aviator's Livery (used to address the gear warning and to implement the altitude call-outs) that was causing users of version 1.81b, who after having reinstalled the default Longitude and installing 1.81b, to no longer be able to see the external / tail registration number for the Longitude, or for any Longitude third party Liveries. If you are not having issues with your prior version of the Longitude mod, through version 1.81, you don't need this update, but this fix will be carried forward into future updates to ensure stability and to avoid this bug recurring.

Version 1.81b Changes:

  • Should resolve the issue for those who have had problems with installation of 1.81 with the Longitude no longer showing up in the aircraft selection menu. There are no changes other than updating the layout.json file. If you have not experienced issues with this, there is no need to download and install this version. If you have problems seeing the Longitude or have CTD issues after installing 1.81b, try removing the mod, then delete the default Longitude from within the sim using the content manager, then reinstall the default longitude using the content manager, then reinstall the mod as instructed. 

Version 1.81 Changes:

  •  Reverts flaps lift coefficient back to prior values in response to Asobo's March 02, 2021 hotfix correcting Asobo's UK update error. This update will restore proper take-off, approach, and landing speeds after the Asobo hotfix.


Version 1.80 Changes:

  • Significant changes to engine parameters to achieve improved, "on the numbers", climb performance at various aircraft weights. Aircraft should follow Cessna spec climb profiles (300 IAS to intercept Mach 0.8 - 457 to 460 KIAS for high speed climb, for example). The aircraft should be able to intercept M0.8 and hold this speed for a climb of approx. 23 minutes to FL430 at MTOW and 16 minutes to FL430 at a takeoff weight of 33k lbs. Climb profile used in Cessna's testing for high speed climb is 290 KIAS to 10k feet (unrestricted climb), 300 KIAS to intercept with M0.8 (at approx. FL300) and hold M0.8 to cruise altitude.   
  • Adjusted engine thrust output as a function of N1 to bring this much closer to real world published N1 / performance results. The range of N1 values needed to maintain specific airspeeds, in particular at cruise, is quite narrow. This update improves performance to replicate this more narrow band of N1 vs thrust performance. 
  • Adjusted PID values for autothrottle to improve speed capture and hold speeds in general and with narrower N1 / thrust banding. There will be more/faster throttle lever movements and adjustments, especially at lower altitudes and airspeeds. This is somewhat experimental at this time.   
  • Adjusted aircraft lift paramaters to bring aircraft closer to real world V-speeds.
  • Further adjustments to stall speed boundaries and aoa limits. However, achieving realistic stall performance at the manufacturer tested speeds has not been possible without disrupting other significant aspects of aicraft performance - the sim doesn't read all values in the lift coeffiecient aoa table entries which makes this effort somewhat limited.
  • Slightly increased elevator authority to increase pitch control, especially at lower speeds like during takeoff and approach. 
  • Corrected flaps lift coefficient after Asobo update from Feb. 16, 2021. 
  • Corrected missing altitude alert callouts in OnAir version.


Please see version notes in the included install_readme file for a list of all changes made since project inception and a list of open items / known issues.

Installation:

  • Download the .zip file and extract to desktop or other location of choice.
  • Please read and follow the installation instructions in the included Install_ReadmeV1.81.txt file carefully.


Installation Note:
To confirm correct installation, when in the livery selection menu for the Longitude in MSFS2020, the default Asobo Longitude livery will display the following in the variant area "FDE Fix V1.82" or "FDE Fix V1.82 OnAir" depending on the install version you choose. This will help you quickly identify whether installation of the package was successful and identify package version - this will only affect the default Asobo livery listing and not other liveries, however the performance modifications will be applied to all livery versions.


The Cessna Citation Model 700 Longitude Performance and Flight Dynamics Modifications Project:
After reading user comments on the forums regarding the Cessna Citation Longitude model from Asobo concerning major autopilot problems, inaccurate weights, fuel load, fuel consumption, handling, etc... and due to my own poor experience and frustration with Asobo's starting efforts, I started work on revising a wide variety of parameters in the configuration files borrowed from the Cessna CJ4 model to match the specifications for the Longitude. I modified the default layout.json file for the Longitude to bypass the encrypted configuration files and point to copied versions of non-encrypted files from the CJ4. These files have all been heavily modified and with a fair amount of guesswork I've been able to produce a working version of the Longitude that is more docile in handling and produces performance numbers that much more closely match the real-world specs. I'm not a Longitude pilot, so my modifications are based on comments on forum topics from those who fly the type, and generous contributions of real world C700 aircraft performance charts, flight manuals, and checklists from fellow flight-sim enthusiasts who also fly IRL for a living. Input from type-rated pilots with knowledge of the aircraft handling and envelope will always be greatly valued.

NOTE: My adjustments are generally focused on performance and handling. Any issues with the G5000 suite and avionics in general are not the subject of this modification. If Asobo chooses to decrypt the xml files associated with the type, a motivated person could presumably start modifying and improving the avionics suite much like has been done with the CJ4 and other un-encrypted aircraft.

I have modified a great many variables and parameters in the available configuration files. I would greatly appreciate feedback on handling, control sensitivies, or other performance related parameters from knowledgable sources so I can continue to improve and update these modifications. If I missed something or you find a performance "glitch" please let me know.

Contribution credit and acknowledgements can be found in the Install_ReadmeVX.XX file included. 


Pretty empty over here.


Pretty empty over here.

  • Version 1.82 March 05, 2021

    Fix restoring tail registration graphic for users who installed 1.81b after reinstalling the default Longitude. Should represent a stable version going forward and avoid this bug appearing in subsequent modification package updates.

  • Version 1.81b March 03, 2021

    fix for users who were having problems with vanishing Longitude or CTD with version 1.81

  • Version 1.81 March 02, 2021

    Reverts Flaps lift coefficient in the flight model to previous values to resolve Asobo Hotfix change to flaps lift coefficient to value prior to UK update.

  • Version 1.80 February 21, 2021

    -Significant changes to engine parameters to achieve improved, "on the numbers", climb performance at various aircraft weights. Aircraft should follow Cessna spec climb profiles (300 IAS to intercept Mach 0.8 - 457 to 460 KIAS for high speed climb, for example). The aircraft should be able to intercept M0.8 and hold this speed for a climb of approx. 23 minutes to FL430 at MTOW and 16 minutes to FL430 at a takeoff weight of 33k lbs. Climb profile used in Cessna's testing for high speed climb is 290 KIAS to 10k feet (unrestricted climb), 300 KIAS to intercept with M0.8 (at approx. FL300) and hold M0.8 to cruise altitude.

    -Adjusted engine thrust output as a function of N1 to bring this much closer to real world published N1 / performance results. The range of N1 values needed to maintain specific airspeeds, in particular at cruise, is quite narrow. This update improves performance to replicate this more narrow band of N1 vs thrust performance.

    -Adjusted PID values for autothrottle to improve speed capture and hold speeds in general and with narrower N1 / thrust banding. There will be more/faster throttle lever movements and adjustments, especially at lower altitudes and airspeeds. This is somewhat experimental at this time.

    -Adjusted aircraft lift paramaters to bring aircraft closer to real world V-speeds.

    -Further adjustments to stall speed boundaries and aoa limits. However, achieving realistic stall performance at the manufacturer tested speeds has not been possible without disrupting other significant aspects of aicraft performance - the sim doesn't read all values in the lift coeffiecient aoa table entries which makes this effort somewhat limited.

    -Slightly increased elevator authority to increase pitch control, especially at lower speeds like during takeoff and approach.

    -Corrected flaps lift coefficient after Asobo update from Feb. 16, 2021.

    -Corrected missing altitude alert callouts in OnAir version.



Title Subject Last Updated Answers
Longitude Flight Dynamics Modifications Project
Support
December 06, 2020
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help
Support
December 06, 2020
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619 Commentaires
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    @dakfly incredible work, patience, and humility!

    Please KNOW another appreciates your work immensely!!

    Thank you and please thank those who sacrifice their time with you to allow you to spend time with us!!!

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    MadMaxx
    March 06, 2021

    After following each steps of the installation the aircraft don't show up in my hangar. When I delete everything the plane is back to the basic one. After multiple attempts no success :(

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    dakfly0219 replied Author
    March 06, 2021
    Try removing and reinstalling the default Longitude in the content manager and then reinstall the mod as instructed.
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    Registration number is back on his place, everything is working fine. Thanks for your work!

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    Dillon
    March 05, 2021

    v1.82 won't display in my sim. It's back to v1.80 for me since v1.81 is unavailable for download.

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    dakfly0219 replied Author
    March 05, 2021
    You may be best served reinstalling the default longitude and installing 1.82. This will probably bring you up to the current stable version of both Longitude and mod. If you try this and it doesn't work, please PM me.
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    Dillon replied
    March 05, 2021
    O.k. that worked, the Longitude loads up in my sim without issue (wonder how many other aircraft that are listed up to date that actually aren't do I need to upgrade). Now all liveries including default aircraft aren't showing tail numbers anymore (v1.82).
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    dakfly0219 replied Author
    March 05, 2021
    Can you double check it’s version 1.82. There are two files presently available to download. Also can you let me know what the version number for your default Longitude is?
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    Dillon replied
    March 05, 2021
    I replied back to you in the Flightsim forums. It has something to do with the copilot mod that's offered on this site.
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    dakfly0219 replied Author
    March 05, 2021
    saw that thread. thank you for investigating. and good to know that's also you.
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    Please ignore the below comment, I had installed it incorrectly.
    The mod is great!
    Follow the instructions to install carefully, its not quite drag and drop.

    If you go into the AI.cfg file and change out what is in there with the two lines below it seems to stop the rolling back and forth at cruise. If you don't like the change, what is behind the ; is the original values and can be changed back.

    rollPID = 1.2, 0.1, 1.2, 8.0, 100.0 ; 1.1, 0.1, 0.8, 8.0, 100.0
    headingPID = 1.3, 0.01, 2.1, 0.2, 1.0 ; 1.0, 0.01, 1.0, 0.2, 1.0

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    dakfly0219 replied Author
    March 05, 2021
    You are not talking about this modification package. The rolling happens with the stock Longitude. If you are seeing this behavior you have not installed the modification package correctly.
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    flightsimthree replied
    March 05, 2021
    I bet I didn't reinstall it properly after the patch, thanks!
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    dakfly0219 replied Author
    March 05, 2021
    Okay - good luck!
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    flightsimthree replied
    March 05, 2021
    It is exactly what I did, I had to delete the aircraft from the content manager, then reinstall, then reapply the layout.json in the F:\FS20\Official\OneStore\asobo-aircraft-longitude folder. This is exactly the suggestion in the readme file, and whaddaya know, it works perfect again!

    Thanks for the great mod, it really makes the plane one I look forward to instead of one I skipped.
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    Nespira
    March 04, 2021

    To Anyone using Steam, the directory to install is the same folder your Community folder is in. Basically, hit Official there instead of Community. Then Steam, then you should be in the folder with all the Asobo assets/models etc. In there go to asobo-aircraft-longitude and replace that json file with the one in the install. Then paste the aircraft-longitudeFDEfix you extracted from the download in your community folder.

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    It's working now for me, delete - install and then your mod (only the registration of the plane is a white block now)

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    dakfly0219 replied Author
    March 03, 2021
    I'll have to check that - I assume you mean the registration number on the tail...
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    Dennis98BE replied
    March 04, 2021
    Affirmative. The reg is blanked out.
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    I can confirm it is working now. Thank you!

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    dakfly0219 replied Author
    March 03, 2021
    You're welcome - I apologize, on behalf of Asobo, for the inconvenience.
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    donpuddo
    March 03, 2021

    Does anybody have the 1.81 Version?
    I tried to jump from 1.80 to 1.81b and now the airplane isn´t visible

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    dakfly0219 replied Author
    March 03, 2021
    Remove mod, delete default longitude using content manager, reinstall default longitude using content manager, then reinstall new mod.
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    Can you maybe post a link to the prior 1.81 then i can try if the problems is solved

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    dakfly0219 replied Author
    March 03, 2021
    I would suggest you remove mod, delete default longitude using content manager, reinstall default longitude using content manager, then reinstall new mod.
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    I changed from 1.81 to 1.81b and now my game won't start (maybe the layout.json is corrupted?) No problems with the 1.81

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    dakfly0219 replied Author
    March 03, 2021
    Why did you install 1.81b if 1.81 worked fine? I'm assuming you saw the version remarks and my comment. See my answer in response to your other request.
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    Dillon replied
    March 04, 2021
    Where can I get v1.81? .81b is crashing my sim as well. I would like not to go through the process of deleting my default version.
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    I've uploaded a new version of the 1.81 installation package that should hopefully resolve the disappearing Longitude mod problem.

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    AnnaM replied
    March 03, 2021
    Thank you for the quick fix, version 1.81b has resolved the CTD issue I had reported earlier!


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Ce mod de Flight Simulator 2020 a été créé par dakfly0219 and shared in Aircraft » All Aircraft pour Microsoft Flight Simulator.

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