Problem Orbit insert for earth using IMFD 5.5

[Interceptor]

Hello,I am using IMFD to get me back from the moon with the default DG,I followed instructions from a tutorial,but when I get to the last step which is inserting into earths orbit,using IMFD's insert orbit tool,I am getting no burn vector,so I am forced to using the circulate orbit option tool,and it's always off about 100kms,or so,can somebody please tell me what I could be doing wrong using orbit insert.Thanks

---------- Post added at 09:47 AM ---------- Previous post was at 05:58 AM ----------

OK,I reinstalled IMFD,and orbit insert seems to work,but it's always off by a bit,after entering the earths soi,and doing the first MCC burn.when should I do the second?

 

[meson800]

Can you post the scenario?

 

[boogabooga]

As always with IMFD, rely on what the map tells you, not the course. Do your MCC such the the periapsis on the map is where you want it. This may involve you fibbing to course as to where you want periapsis, such that it is correct on the map.

If periapsis is correct, your orbit insert should go smoothly.

 

[Interceptor]

Ok heres the scenario it has been saved so it starts at the earth's SOI 50.Thanks

EGIN_DESC

END_DESC

BEGIN_ENVIRONMENT
  System Sol
  Date MJD 52010.5488163937
END_ENVIRONMENT

BEGIN_FOCUS
  Ship GL-NT
END_FOCUS

BEGIN_CAMERA
  TARGET GL-NT
  MODE Extern
  POS 4.62 51.82 -18.01
  TRACKMODE TargetRelative
  FOV 50.00
END_CAMERA

BEGIN_HUD
  TYPE Orbit
  REF AUTO
END_HUD

BEGIN_MFD Left
  TYPE Orbit
  PROJ Ship
  FRAME Ecliptic
  ALT
  REF Earth
END_MFD

BEGIN_MFD Right
  TYPE User
  MODE Interplanetary
  Scenario Old2
  MapMFD V5
  Reference Auto
  Target none
  Center GravityRef
  Data 0 1 1e-006 1 0 0 0 0 1 0 0 0
  MassLimit 1e+020
  CMode 0
  Config 1 1 1 1 0 0
  ExtMode 0
  Periapis none
  END 
  CorMFD V4
  Reference Earth
  Target Equator
  Source Moon
  ActiveProg 3 3
  DataA 0 3 0 0 0 0
  DataB 1 1 52010.54844145862 0 500 2.710610686570918 0.5235987755982988 0 52012.18602070137
  DVProg 0 0 0 1
  AdvConf 0 0 0 0 0
  Guidance 0
  END 
  EjectMFD V5
  Reference Auto
  Data 1 1.5 3 0 0 52010.54844145862 2352.93
  Guidance 1
  END 
  BaseAprMFD V2
  Reference Auto
  Target none
  Source GL-NT
  DataA 0 0 120000 0.10821 0.366519 1 1 52006.74873081373 52006.79074535208 0
  DataB 0 3 0 1 0 1
  END 
  SlingMFD V4
  Reference Auto
  Source GL-NT
  Data 0 1 1 3 0 0 52006.74873081373 0
  END 
  LaunchMFD V4
  Target 0
  Data 0 1 1 3 0 1 52006.91309338512
  END 
  CF1_DataA 1 0
  CF1_DataB 52006.7485132526 10 120000 2 20 150000
  CF1_SecTgt 
  mfdShare 0
  mfdProgram 3
END_MFD

BEGIN_PANEL
END_PANEL

BEGIN_SHIPS
ISS:ProjectAlpha_ISS
  STATUS Orbiting Earth
  RPOS 1115750.77 6329088.90 -2002678.98
  RVEL 7457.238 -1632.250 -984.387
  AROT 30.00 0.00 50.00
  AFCMODE 7
  IDS 0:588 10 1:586 10 2:584 10 3:582 10 4:580 10
  NAVFREQ 0 0
  XPDR 466
END
Mir:Mir
  STATUS Orbiting Earth
  RPOS 4813116.47 -281679.54 -4606049.30
  RVEL 5349.671 340.927 5573.984
  AROT 0.00 -45.00 90.00
  AFCMODE 7
  IDS 0:540 10 1:542 10 2:544 10
  XPDR 482
END
Luna-OB1:Wheel
  STATUS Orbiting Moon
  RPOS 2230655.58 -185251.35 -435.69
  RVEL 122.460 1474.912 4.024
  AROT 0.00 -0.00 -27.74
  VROT 0.00 0.00 10.00
  AFCMODE 7
  IDS 0:560 10 1:564 10
  XPDR 494
END
PB-01:ShuttlePB
  STATUS Landed Moon
  BASE Brighton Beach:2
  POS -33.4450804 41.1217033
  HEADING 220.00
  AFCMODE 7
  PRPLEVEL 0:1.000000
  NAVFREQ 484 124
END
GL-01:DeltaGlider
  STATUS Landed Earth
  BASE Habana:2
  POS -82.3988276 22.9994604
  HEADING 174.13
  AFCMODE 7
  PRPLEVEL 0:1.000000 1:1.000000
  NAVFREQ 0 0 0 0
  XPDR 0
  GEAR 1 1.0000
  AAP 0:0 0:0 0:0
END
GL-NT:DeltaGlider
  STATUS Orbiting Earth
  RPOS -235581353.12 66590035.98 -82363310.30
  RVEL 967.653 -38.370 181.908
  AROT 47.37 -11.64 17.41
  RCSMODE 2
  AFCMODE 7
  PRPLEVEL 0:0.876795 1:0.992841
  NAVFREQ 0 0 0 0
  XPDR 0
  RCOVER 1 1.0000
  RADIATOR 1 1.0000
  LIGHTS 1 1 1 0
  AAP 0:0 0:0 0:0
END
SH-02:ShuttleA
  STATUS Landed Moon
  BASE Brighton Beach:5
  POS -33.4299196 41.1282966
  HEADING 43.18
  AFCMODE 7
  PRPLEVEL 0:1.000000 1:1.000000
  NAVFREQ 0 0
  XPDR 0
  PODANGLE 0.0000 0.0000
  DOCKSTATE 0 0.0000
  AIRLOCK 0 0.0000
  GEAR 0 0.0000
  PAYLOAD MASS 0.0 0
END
GL-02:DeltaGlider
  STATUS Landed Mars
  BASE Olympus:3
  POS -135.4300000 12.7366196
  HEADING 0.00
  AFCMODE 7
  PRPLEVEL 0:1.000000 1:1.000000
  NAVFREQ 0 0 0 0
  XPDR 0
  GEAR 1 1.0000
  AAP 0:0 0:0 0:0
END
loco01:SaganSpaceport\\loco01
  STATUS Landed Earth
  POS 169.5370000 -0.8578510
  HEADING 270.00
  AFCMODE 7
  NAVFREQ 0 0
  CradleP 0.00
  CradleT 0
  Angle 0.00
  SpeedT 0
  SpeedC 0
END
Crane:SaganSpaceport\\XR5_Crane
  STATUS Landed Earth
  POS 169.5270000 -0.8542000
  HEADING 90.00
  AFCMODE 7
  NAVFREQ 0 0
  X_P 0.50
  Y_P 0.00
  Z_P 0.50
  X_T 0.50
  Y_T 0.00
  Z_T 0.50
END
LPad:SaganSpaceport\\ThemL_Pad
  STATUS Landed Earth
  POS 169.5375920 -0.8578510
  HEADING 270.00
  AFCMODE 7
  PRPLEVEL 0:1.000000
  NAVFREQ 0 0
  Arms_P 0.999994
  Arms_T 1.000000
  Lights 0
END
Radar:SaganSpaceport\\Radar
  STATUS Landed Earth
  POS 169.5330990 -0.8597000
  HEADING 270.00
  AFCMODE 7
  NAVFREQ 0 0
END
BPad:SaganSpaceport\\Big_Pad
  STATUS Landed Earth
  POS 169.5321950 -0.8686880
  HEADING 180.00
  AFCMODE 7
  PRPLEVEL 0:1.000000
  NAVFREQ 0 0
  Lights 0
  Config -1
END
Weather station:WS
  STATUS Landed Earth
  POS 169.5321950 -0.8686880
  HEADING 180.00
  AFCMODE 7
  NAVFREQ 0 0
END
END_SHIPS

BEGIN_ExtMFD
END

BEGIN_VesselParametersMFD
END

BEGIN_uap
END

BEGIN_ReFuelMFD
  SCENARIO_TREE 
    NAMED Computers
    END_NODE 
  END_NODE 
END

 

[meson800]

Like Boogabooga said,use the map program.
At the above scenario start, I switched the left MFD to IMFD's map mode, and burned prograde until PeA was around 300k.
I then switched the right MFD to orbit insert mode , hit AB, time accelerated, and IMFD inserted correctly.

 

[Interceptor]

I use base approach in the left mfd,and use the IMFD map in the right mfd. before using orbit insert.

 

[Cras]

Using the delta v program with the map set to max accuracy is a pretty powerful tool.

 

[Interceptor]

I use the deltaV tool to change altitudes in orbits all the time,but how do you use it for mcc'a with the map at highest accuracy?

 

[boogabooga]

Using the delta v program with the map set to max accuracy is a pretty powerful tool.

TransX mode, except accurate.

I wouldn't use Delta-V here. I would use base approach or planet approach. Just alter the periapsis altitude, but trust the actual periapsis on the map. The periapsis you actually enter is not reliable.

There is also an option in configuration to set a base and landing time. Map will tell you how many degrees your orbit is misaligned from passing directly over the base.

 

[Tommy]

I use the deltaV tool to change altitudes in orbits all the time,but how do you use it for mcc'a with the map at highest accuracy?

Here is an example from a flight I made last night - a Brighton Beach to KSC direct re-entry in an XR-2.

I used Base Approach in left MFD to plan the flight (src = moon, tgt = cape canaveral, ReA 4.5 degrees, Ant 90, re-entry mode). I set the "Landing Target" on the main config page first, but didn't bother with "Landing Time" (wouldn't know that yet anyway. Set TEj to 6400s and increased HInt to minimize dV (ended up with 904 m/s). Opened IMFD in right MFD, set OpMode to shared with the left (0). Used Surface Launch set to "Base Approach" to launch, then used Orbit Eject set to "Base Approach" to make the TEI burn (about 54 seconds burn time).

Once I got about half way between the Moons's SOI and the Earth's SOI, I set the left MFD to Delta-V, ref = Earth (make sure it isn't "Sun" or "Moon"). Make sure all dV values are set to zero (default has 10 ms of dVf) and set the TEj to about 200 seconds. Now, on the right, open IMFD's Map. Hit the Mode button until you get the Map config page and set "accuracy" to 1 (highest), then hit the Mode button twice more - this will leave you at a page that shows the target base and an "Ang" number on the lower left. Now hit the Plan button - the trajectory should be displayed in blue. Adjust dVi to set the PeA at about 68k (for direct re-entry) and adjust dVp to reduce the Ang to zero. This burn was less than 1 second. Made a second burn shortly after entering the Earth's SOI to adjust the PeA a bit - this burn was a few milliseconds (Autoburn used just trans RCS). That was it - while if I had used Base Approach the burns would have been a few seconds each - and less accurate (Base Approach doesn't work with Map's "Plan" feature.

I use Delta-V for ALL my MCC's and Approach burns.

 

[Cras]

I use the deltaV tool to change altitudes in orbits all the time,but how do you use it for mcc'a with the map at highest accuracy?

you set it to plan and as you adjust the various values it will show you what your perigee will be, and the angle from your picked target base will be

 

[Interceptor]

How do you set the landing target in the config?

 

[Cras]

Its in the configuration page. You will see a line that says landing site, and it will be blank. You type in your base there, and it will be the base used in the landing mode of the map program. I then use that coupled with Delta V program until I get my perigee at the right altitude, close to the right latitude and that my track passes zero degrees over my base, this is for when I come back from the moon and am doing a direct return with the XR-2.

 

[Interceptor]

So could you use this same method with the orbit insert tool also?

 

[Cras]

Well, since you are looking at insertion back into low earth orbit, you really should not worry about where you pass over your targeted base because the Earth rotates so fast. You can however use the base approach program which will allow you to enter in how many orbits you want to pass over the base, so for example, to give yourself time to ready yourself for deorbit, you can enter 2, which would give you some time from the earth insertion to when you will actually pass over your base.

Doing the method I described, which guarantees you pass over the pass on your current pass, really only helps setting up a direct return and re-entry.

 

[Interceptor]

Thanks for the great info everyone.
:thumbup: