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Old 01-01-2009, 03:09 PM   #16
RisingFury
OBSP developer
 
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Quote:
Originally Posted by Arrowstar View Post
 You need to bring that ApR way down, I think. If it's that high you have far too much energy built up, and when you hit the atmosphere you will either skip off or, more likely, be moving far too fast and simply break up. Try a retro-grade burn at Pe and see what it does for you.

The whole point is to keep the ApR high so you barely hit the atmosphere! That will ensure you lose a lot velocity gradually and *not* break up.
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Old 01-01-2009, 04:46 PM   #17
flytandem
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Quote:
Originally Posted by Tommy View Post
 I wouldn't have thought of that, but it makes sense. It would take a fair amount of skill to set up that trajectory, but it doesn't need to be perfect. TransX for the initial flightplan, and IMFD's Map program (at max accuracy) to tune the Earth PE (do this with fore/aft translational RCS about 20 min after moon Pe) if needed. Direct re-entry (inverted). Flown right, at the ~10km/s velocity you'ld have coming in, you could easily get a full orbit and over 4M crossrange from a DGIV to make up for any inaccuracies.

I went ahead and set up a scenario with a DGIV nearly out of fuel so it must round the moon. A TransX plan shows the sling to the Earth. A maneuver is set up to match the plan. Just advance to the date of maneuver and rotate to direction and burn. I flew the mission with a MCC using TransX about the ship's Ap and watching IMFD Map to see the result in the burn to stop it when the ship Pe at Earth is 65 Km. It arrived as planned but I have no clue how to do a reentry in a DGIV. Here's the initial scenario (in bold text) with the TransX plan ready to go. It uses the latest version of TransX, 3.13 .

BEGIN_DESC
GeoStationary to KSC.
END_DESC

BEGIN_ENVIRONMENT
System Sol
Date MJD 54850.2016707755
END_ENVIRONMENT

BEGIN_FOCUS
Ship geo2home
END_FOCUS

BEGIN_CAMERA
TARGET geo2home
MODE Cockpit
FOV 60.00
END_CAMERA

BEGIN_HUD
TYPE Orbit
REF AUTO
END_HUD

BEGIN_MFD Left
TYPE User
MODE TransX
Ship geo2home
FNumber 3
Int 0
Orbit True
Vector 42159729.0298 60159.7779515 -138688.982819
Vector 11.0260309871 -1223.60896198 2820.83723592
Double 3.98600439969e+014
Double 54850.1899749
Handle Earth
Handle NULL
Handle Moon
Select Target
0 Moon
Autoplan
0 0
Plan type
0 0
Plan
0 0
Plan
0 0
Plan
0 0
Select Minor
0 None
Manoeuvre mode
0 1
Base Orbit
0 0
Prograde vel.
4 1080.0086026
Man. date
5 54850.6214736
Outward vel.
0 0
Ch. plane vel.
0 0
Intercept with
0 0
Orbits to Icept
0 0
Graph projection
0 0
Scale to view
0 0
Advanced
0 0
Finvars
Finish BaseFunction
Int 4
Orbit True
Vector 285960900.2 143752270.437 290911936.884
Vector -565.977388336 -283.117614731 -527.936284508
Double 4.90279493298e+012
Double 54854.8017556
Handle Moon
Handle NULL
Handle NULL
Select Target
0 Escape
Autoplan
0 0
Plan type
0 1
Plan
0 0
Plan
0 1
Plan
0 0
Select Minor
0 None
Manoeuvre mode
0 0
Base Orbit
0 0
Prograde vel.
0 0
Man. date
0 54850.201568
Outward vel.
0 0
Ch. plane vel.
0 0
Intercept with
0 0
Orbits to Icept
0 0
Graph projection
0 0
Scale to view
0 0
Advanced
0 0
View Orbit
0 0
Finvars
Finish BaseFunction
Int 3
Orbit True
Vector 314897530.09 -5120436.32587 -88879793.4488
Vector 52.5341357223 9.8514205252 215.619681617
Double 4.03503234902e+014
Double 54860.6770384
Handle Earth
Handle Moon
Handle NULL
Select Target
0 None
Autoplan
0 0
Plan type
0 2
Plan
0 0
Plan
0 0
Plan
0 2
Select Minor
0 None
Manoeuvre mode
0 0
Base Orbit
0 0
Prograde vel.
0 0
Man. date
0 54850.2015586
Outward vel.
0 0
Ch. plane vel.
0 0
Intercept with
0 0
Orbits to Icept
0 0
Graph projection
0 0
Scale to view
0 0
Advanced
0 0
Velocity.
0 0
Outward angle
0 3.11366738556
Inc. angle
0 0
Inherit Vel.
0 0
Eject date
0 54860.6770384
Finvars
Finish BaseFunction
END_MFD

BEGIN_MFD Right
TYPE User
MODE TransX
END_MFD

BEGIN_PANEL
END_PANEL


BEGIN_SHIPS
geo2home:DeltagliderIV
STATUS Orbiting Earth
RPOS 42056415.45 -1175372.82 2709638.18
RVEL -215.408 -1220.610 2813.927
AROT 0.00 0.00 0.00
PRPLEVEL 0:0.040 1:0.060 2:0.983
IDS 0:45 100
NAVFREQ 0 0
XPDR 0
;-------------------------- Skin parameters must contain directory name of skin (without space)
MeshSkin spacetech
;-------------------------- Cargo payload must contain name of config file or "none".(see doc)
CargoPayload none
NOSECONE 0 0.00
GEAR 0 0.00
AllDoorsState 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00 0 0 0.00
But1Cockpit 0 0 0 2 2 2 0 2 2 2 2 2 2 2 2 1 1 2 1 1 1 5
But2Cockpit 0 0 0 0 0 0 0 0 2 2 2 2 2 0 3 0 0 0 1 1 0 0
TransEffect 0
LifeBut1State 0 2 1 2 1 2 2 2 2 2 2 2 2 0 0
LevelBatt 100.0000
Emergency_power 10000.0000
VoltageStartBus 0.0000
VoltageGen1 96.2800
VoltageGen2 96.2800
VoltageGenBus 96.0000
O2tankALevel 99.9272
N2tankALevel 100.0000
O2tankBLevel 100.0000
N2tankBLevel 100.0000
CabinO2Level 21.3955
CabinCO2Level 600.0000
CabinTempLevel 21.1012
CabinPressure 14.7000
CabinMoistLevel 36.0000
CabinDustLevel 0.0001
CabinO2Setting 21.4000
CabinTempSetting 21.2000
CabinPressSetting 14.7000
AntennaTarget no_target
O2ConsumptionSetting 1
FuelConsumptionSetting 1
MainenginePower 1
;------------------Crew parameters UMMUCREW Function-Name-Age-CardiacPulse-WeightKg (fonction of Pilot must be: Capt)
NoOneOnBoard 0
NoPilotOnBoard 0
UMMUCREW Capt-Francois_Bowman-41-65-78
UMMUCREW -Peter_Dawson-35-69-79
FailGearFailure 0
FailGearCollapse 0
FailLeftMainEngine 0
FailRightMainEngine 0
FailHoverEngine 0
FailRcs 0
FailSurfaceControl 0
FailComputer 0
FailComputerBlueScreen 0
FailAutopilot 0
FailExtRadiator 0
FailAirbrake 0
FailNoseCone 0
FailCanopy 0
FailAntenna 0
FailLeftTurbo 0
FailRightTurbo 0
FailCargoDoor 0
SpacesuitTimer 0
END
END_SHIPS

BEGIN_ExtMFD
END
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