Ananke Prototype Downloads

[n0mad23]

Without further delay, the ZTC-Ltd. Ananke Tether-Sling Prototype is available for your experimentation.

With this release, the enclosed scenario will take you to [FONT=Arial, Helvetica, sans-serif]the moon with a 33km perilune and a 165deg inclination with no mid course corrections. That's right, NO MID COURSE CORRECTIONS!

The release includes the ability for users to create their own custom lunar tosses as well. The Ananke tether-sling prototype is configurable to allow you to choose any date for your lunar departure. Please read the following requirements carefully.

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Ananke Prototype
release v0.1
(n0mad23 and Tblaxland developers)
120 kilometer long platform, with approx. 100 km radius of rotation

Both attached zip-files must be downloaded and installed.

Required Add Ons:

Vinka's Spacecraft3.dll - available at http://users.swing.be/vinka/spacecraft3_2006-P1.zip
Patch1 http://users.swing.be/vinka/spacecraft3_060302.zip

Jarmo Nikkanen's IMFD V5.1h at http://koti.mbnet.fi/jarmonik/IMFD51.zip

Not required but highly recommended, Tblaxland's AttitudeMFD from [ame="http://www.orbithangar.com/searchid.php?ID=3165"]Attitude MFD V3.2[/ame]

If you're going to create your own scenarios, you'll need lumpiluk's Lego Addon from [ame="http://www.orbithangar.com/searchid.php?ID=3378"]LEGO brick[/ame] as this is what we're currently using for our "phantom vessel." EDIT: Make sure you install this addon before you install the attached files (because we modify the Lego config file to increase the thrust).

Likewise, if you're making your own scenarios, you'll need MS Excel or a spreadsheet program that can use .xls extensions.

Please see the attached documentation in your Orbiter/Doc/ZTC Transport Ltd directory.


Download both zip files, and unzip into your Orbiter root directory. Comments, criticisms, and feedback are welcome and should be posted here: http://www.orbiter-forum.com/showthread.php?t=684


Operating Instructions:
1. Run Orbiter and load "120km Ananke Lunar Intercept" making sure
AttitudeMFD and IMFD are activated and your MFD refresh rate is 0.1s.

2. Open AttitudeMFD and select Velocity mode.

3. Open IMFD and select Map mode. Select Moon as the Target.

4. Watch Pitch in AttitudeMFD. When it gets to -88deg, slow time to 0.1x.
When pitch gets to -90deg hit Ctrl-D to undock.

5. You're on your way to the moon, baby! Do MCCs as required.


​

 

[n0mad23]

To create your own lunar interceptions, you'll need MS Excell, or a compatible spread-sheet program.

Scenario Creation Instructions
(contained in zip-file documentation)
​

ZTC Transport – Ananke – Lunar Intercept Instructions
Instructions for generating a lunar intercept scenario are as:

1. In a text editor, open the scenario "LEGO Brick 485km Eq Circ Orbit.scn" and put in an approximate MJD date close to when you want a lunar
transfer to occur, eg, 59247.0 (2008-Feb-02).

2. Scroll down to the vessel LS_brick and change the last number in the
ELEMENTS line to the same MJD.

3. Save and close the scenario.

4. Open "ZTC_Tether_Orbital_Calculations.xls" spreadsheet.

5. Start Orbiter, make sure IMFD and Scenario Editor are activated and
load the scenario "LEGO Brick 485km Eq Circ Orbit".

6. Open IMFD in one MFD and OrbitMFD (Frm: ECL Prj: SHP) in the other.

7. In IMFD, make sure TOF-Locked is on then set TEj to 0 and TIn to 346k.

8. Adjust TEj until EIn = 0.00.

9. Change TOF-Locked to TOF-Unlocked.

10. Adjust TEj to minimise EjA (<0.5 should be achievable).

11. Use the Scenario Editor to bring the time within an hour or so of TEj.

12. Adjust TIn to get EIn = 0.00 then TEj to get settings as described in step 10.

13. In IMFD, switch to Burn Vector view and enter dVf and dVo into the
spreadsheet.

14. Adjust Tip Velocity until Payload Velocity Error is close to zero (<0.1 m/s)

15. In IMFD, increase TEj until EjA is approx equal to Flight Path Angle in
the spreadsheet.

16. Perform steps 13 to 15 until Payload Velocity Error is <0.1m/s and EjA
Error <0.1deg.

17. Time accelerate until TEj is approx 100s.

18. Perform steps 13 to 16 again if necessary.

19. Pause time.

20. Enter Vel from OrbitMFD into spreadsheet under Phantom Vessel
Velocity.

21. Enter IMFD TEj into the spreadsheet.

22. Open Scenario Editor. Copy and paste MJD into spreadsheet.

23. Unpause time and pause again as soon as TEj = 0.

24. From OrbitMFD enter TrL into spreadsheet.

25. Exit Orbiter.

26. In a text editor, open scenario "120km Ananke Lunar Intercept.scn".

27. Copy and paste MJD Catch from the spreadsheet in to the Date and
Ananke ELEMENTS fields.

28. Copy and paste Ananke Orbit Elements SMa and Ecc into first two fields
of Ananke ELEMENTS. Remember to move the SMa decimal place
three places to the right.

29. Copy and paste LPe Catch into the fifth and sixth fields of Ananke
ELEMENTS.

30. Calculate the second field of Ananke AROT by -90 + LPe and enter into
scenario.

31. Copy and paste Tether Parameters Angular Velocity * -1 into the first
field of Ananke VROT.

32. Save and close scenario.

33. Run Orbiter and load "120km Ananke Lunar Intercept" making sure
AttitudeMFD and IMFD are activated and your MFD refresh rate is 0.1s.

34. Open AttitudeMFD and select Velocity mode.

35. Open IMFD and select Map mode. Select Moon as the Target.

36. Watch Pitch in AttitudeMFD. When it gets to -88deg, slow time to 0.1x.
When pitch gets to -90deg hit Ctrl-D to undock.

37. You're on your way to the moon, baby! Do MCCs as required.

 

[tblaxland]

Here is another scenario that has you launching to the moon in the daylight to give you a better view of the rapidly receding tether upon undocking.

 

[n0mad23]

It's available at Orbit Hanger as well, here: [ame="http://www.orbithangar.com/searchid.php?ID=3399"]Ananke Tether-Sling v0.2[/ame]

And the above scenario with an additional scenario where the Delta-G's attached to the docking port on the countermass is available here: [ame="http://www.orbithangar.com/searchid.php?ID=3402"]Search[/ame]

This package also includes more detailed operating instructions in the Docs folder.