Scenario climbing the ladder

flytandem

Tutorial Publisher
Tutorial Publisher
Joined
Oct 19, 2007
Messages
499
Reaction score
4
Points
0
Location
San Bernardino
Website
www.flytandem.com
Starting with today's date I was looking for a "bottom to top" Mercury to Neptune flight. Found one that starts a week from today (Dec 3rd 2010). 17 stages of TransX involving 3 slings of Venus, 2 slings of Earth, then single slings of Jupiter and Saturn takes you direct to Neptune. Fuel has been somewhat limited with about 1500 m/s spare for MCC on those slings. Total flight time is a bit over 18.5 years.

Code:
BEGIN_DESC
Starting on Mercury, a 17 stage TransX plan that takes you through, 3 slings of Venus, then 2 slings of Earth, then Jupiter Saturn and finally to Neptune. Fuel is enough for the trip, but staying at Neptune will probably only happen with some aerobraking.
END_DESC

BEGIN_ENVIRONMENT
  System Sol
  Date MJD 55533.7998703142
END_ENVIRONMENT

BEGIN_FOCUS
  Ship 1
END_FOCUS

BEGIN_CAMERA
  TARGET 1
  MODE Cockpit
  FOV 60.00
END_CAMERA

BEGIN_HUD
  TYPE Surface
END_HUD

BEGIN_MFD Left
  TYPE User
  MODE TransX
  Ship  1
  FNumber 17
  Int 1
  Orbit True
  Vector  2372855.28216 -259574.1106 -505758.472592
  Vector  0.648537404697 0.181162323883 2.94974862147
  Double  2.20320914692e+013
  Double  55533.7998703
  Handle Mercury
  Handle NULL
  Handle NULL
Select Target
 0 Escape
Autoplan
0 0
Plan type
0 0
Plan
0 1
Plan
0 0
Plan
0 0
Select Minor
 0 None
Manoeuvre mode
0 0
Base Orbit
0 0
Prograde vel.
 0  0
Man. date
 0  55533.7998703
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
Pe Distance
 0  2928000
Ej Orientation
 0  0
Equatorial view
0 0
Finvars
  Finish BaseFunction
  Int 2
  Orbit False
  Handle Sun
  Handle Mercury
  Handle Venus
Select Target
 0 Venus
Autoplan
0 0
Plan type
0 2
Plan
0 0
Plan
0 0
Plan
0 1
Select Minor
 0 None
Manoeuvre mode
0 0
Base Orbit
0 1
Prograde vel.
 0  0
Man. date
 0  55533.7997001
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
Prograde vel.
 0  5967.51312902
Eject date
 0  55533.8662551
Outward vel.
 0  276
Ch. plane vel.
 0  -1785.10270833
Finvars
  Finish BaseFunction
  Int 4
  Orbit True
  Vector  4773773574.71 1600057039.74 -3497192253.39
  Vector  -7228.567009 -2433.73234508 5313.52001543
  Double  3.2485863e+014
  Double  55590.725478
  Handle Venus
  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  55533.7997026
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  -102800940575 5470941426.68 -32371262154.4
  Vector  1047.27468173 -353.160274439 -33062.25757
  Double  1.32712764814e+020
  Double  55598.3349131
  Handle Sun
  Handle Venus
  Handle Venus
Select Target
 0 Venus
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  55533.7997052
Outward vel.
 0  0
Ch. plane vel.
 0  0
Intercept with
0 0
Orbits to Icept
0 2
Graph projection
0 0
Scale to view
0 0
Advanced
0 0
Velocity.
 0  0
Outward angle
 3  1.86191724602
Inc. angle
 0  0
Inherit Vel.
0 0
Eject date
 0  55598.3349131
Finvars
  Finish BaseFunction
  Int 4
  Orbit True
  Vector  5262899968.27 -337342367.922 -3125343283.58
  Vector  -7980.87262265 528.055476673 4712.99667291
  Double  3.2485863e+014
  Double  55887.7298829
  Handle Venus
  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  55533.7997188
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  73525482137.5 -5312147430.13 -80169472882.6
  Vector  19554.184938 -2823.44349467 30417.8574642
  Double  1.32712764814e+020
  Double  55895.3515243
  Handle Sun
  Handle Venus
  Handle Venus
Select Target
 0 Venus
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  55533.7997301
Outward vel.
 0  0
Ch. plane vel.
 0  0
Intercept with
0 0
Orbits to Icept
0 3
Graph projection
0 0
Scale to view
0 0
Advanced
0 0
Velocity.
 0  0
Outward angle
 4  -1.22558521058
Inc. angle
 0  0
Inherit Vel.
0 0
Eject date
 0  55895.3515243
Finvars
  Finish BaseFunction
  Int 4
  Orbit True
  Vector  -712523081.438 -42279141.0563 -6088523825.68
  Vector  1103.8698548 62.5881145073 9220.27561231
  Double  3.2485863e+014
  Double  56631.3798199
  Handle Venus
  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  55533.7997362
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  48469242352.8 -1475644918.83 96488065756.7
  Vector  -34453.3868166 2322.26181116 24317.8635307
  Double  1.32712764814e+020
  Double  56638.9986064
  Handle Sun
  Handle Venus
  Handle Earth
Select Target
 0 Earth
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  55533.7997474
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  0.773813365954
Inc. angle
 0  0.224243392954
Inherit Vel.
0 0
Eject date
 0  56638.9986064
Finvars
  Finish BaseFunction
  Int 4
  Orbit True
  Vector  5063288310.36 -327308794.572 -7571978018.09
  Vector  -7420.40632715 481.640844908 11148.6033786
  Double  3.98600439969e+014
  Double  56671.8154045
  Handle Earth
  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  55533.7997573
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  -78803900253.4 -1284066.26126 124407181902
  Vector  -35376.658999 426.284381839 -6866.96532624
  Double  1.32712838556e+020
  Double  56679.678305
  Handle Sun
  Handle Earth
  Handle Earth
Select Target
 0 Earth
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  55533.7998703
Outward vel.
 0  0
Ch. plane vel.
 0  0
Intercept with
0 0
Orbits to Icept
0 1
Graph projection
0 0
Scale to view
0 0
Advanced
0 0
Velocity.
 0  0
Outward angle
 4  1.21713809625
Inc. angle
 0  0
Inherit Vel.
0 0
Eject date
 0  56679.678305
Finvars
  Finish BaseFunction
  Int 4
  Orbit True
  Vector  7228657233.35 4287017.99389 -5552068050.3
  Vector  -10593.20063 0.598185123319 8175.59475679
  Double  3.98600439969e+014
  Double  57767.5316099
  Handle Earth
  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  55533.7994035
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  -78742540442.9 11633474.7981 124468738091
  Vector  -37647.236822 -591.078027737 -10152.664764
  Double  1.32712838556e+020
  Double  57775.4061845
  Handle Sun
  Handle Earth
  Handle Jupiter
Select Target
 0 Jupiter
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  55533.7993998
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 1
Advanced
0 0
Velocity.
 0  0
Outward angle
 1  1.0047162372
Inc. angle
 0  -0.0404916386462
Inherit Vel.
0 0
Eject date
 0  57775.4061845
Finvars
  Finish BaseFunction
  Int 4
  Orbit True
  Vector  443377689884 -15245796194.9 116874120282
  Vector  -6806.64848751 234.502521495 -1761.89702682
  Double  1.26686534397e+017
  Double  57778.2596852
  Handle Jupiter
  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  55533.7993974
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  -285653264140 9306643022.97 -760186323173
  Vector  15304.0035226 -463.206097109 -10242.2946665
  Double  1.32839126489e+020
  Double  58517.4418617
  Handle Sun
  Handle Jupiter
  Handle Saturn
Select Target
 0 Saturn
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  55533.7993949
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 1
Advanced
0 0
Velocity.
 0  0
Outward angle
 2  0.700187698656
Inc. angle
 0  0.00371755130675
Inherit Vel.
0 0
Eject date
 0  58517.4418617
Finvars
  Finish BaseFunction
  Int 4
  Orbit True
  Vector  -386664544955 -2442788862.55 387945160811
  Vector  7293.09311568 50.2108796317 -7322.01261983
  Double  3.79311866084e+016
  Double  58841.1811932
  Handle Saturn
  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  55533.7993912
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  969907787092 -21029591399.8 -1.1191826759e+012
  Vector  9653.18441479 -8182.35396784 12447.7017643
  Double  1.32750371142e+020
  Double  59452.3050375
  Handle Sun
  Handle Saturn
  Handle Neptune
Select Target
 0 Neptune
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  55533.7993875
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
 1  0.810073628362
Inc. angle
 3  -0.0305711871779
Inherit Vel.
0 0
Eject date
 0  59452.3050375
Finvars
  Finish BaseFunction
  Int 5
  Orbit True
  Vector  -853999263880 16736298130.6 -135504117722
  Vector  13066.2523553 -257.006195712 2090.56288459
  Double  6.83652886371e+015
  Double  61565.6844553
  Handle Neptune
  Handle NULL
  Handle NULL
Select Target
 0 None
Autoplan
0 0
Plan type
0 1
Plan
0 0
Plan
0 2
Plan
0 0
Select Minor
 0 None
Manoeuvre mode
0 0
Base Orbit
0 0
Prograde vel.
 0  0
Man. date
 0  55533.7993801
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
Draw Base
0 0
Finvars
  Finish BaseFunction
END_MFD

BEGIN_MFD Right
  TYPE User
  MODE TransX
END_MFD

BEGIN_SHIPS
1:DeltaGlider
  STATUS Landed Mercury
  POS -0.0002780 -0.0034900
  HEADING 90.60
  AFCMODE 7
  PRPLEVEL 0:0.216000 1:0.150000
  NAVFREQ 402 94 0 0
  XPDR 2
  GEAR 1 1.0000
  RCOVER 1 1.0000
  AAP 0:0 0:0 0:0
END
END_SHIPS
 

N_Molson

Addon Developer
Addon Developer
Donator
Joined
Mar 5, 2010
Messages
8,853
Reaction score
2,577
Points
203
Location
Toulouse
Wow, that's a nice little tour :thumbup:
 

Wishbone

Clueless developer
Addon Developer
Joined
Sep 12, 2010
Messages
2,421
Reaction score
1
Points
0
Location
Moscow
Code:
There's a feeling I get
When I look to the west,
And my spirit is crying for leaving.

sorry, couldn't resist :) it really makes me wonder...
 

dgatsoulis

ele2png user
Joined
Dec 2, 2009
Messages
1,846
Reaction score
142
Points
78
Location
Sparta
Another beautiful scenario. Thanks flytandem!

I know that you have an extensive experience in Orbiter and i have to admit that i know no one else with your ability to "intuitively see" launch windows and slingshot opportunities.

Your tutorials, challenges and scenarios are "eyeopening" (to say the least), any Orbinaut who wants to "move up" a level, should definitely check them out.

Now, i have a question.

What is the process that you go through, when you attempt to set up a multiple slingshot scenario, such as this one (or the any of the other ones on your page)?

Do you start with just an opportunity (launch window), to get you from A to B and then work your way from that, or do you have a goal set and then say, for example: "hmm, i want to get from Mercury to Neptune, using this amount of dV, let's see how that can be done"?

I'm particularly interested in how you come up with double or even triple passes over the same planet, in order to set up a slingshot that will get you to your next destination.

I do know that most of the process that you go through, comes from experience and hundreds (or even more than a thousand, interplanetary flights by now), but i believe that the rest of us in the community would greatly benefit, if you could show us what goes on in your mind, when you set up such a flight.

With the outmost respect,
Dimitris

P.S.: Always have fun, happy orbiting!
:cheers:
 

Tex

O-F Administrator
Administrator
Tutorial Publisher
Joined
Oct 16, 2007
Messages
6,572
Reaction score
57
Points
123
Location
Houston
Website
youtube.com
Thanks again for an amazing sling plan Rob! :cheers:

dgatsoulis: I think he just starts with the current date and see's what is available. I too would love to learn more from the master, I should think only the Probe knows more about this than flytandem in any case. :)
 

Tex

O-F Administrator
Administrator
Tutorial Publisher
Joined
Oct 16, 2007
Messages
6,572
Reaction score
57
Points
123
Location
Houston
Website
youtube.com
Working on it, though I've already used more fuel than I would have liked. So far the flight is going as planned... (I think.. :lol:)

First Venus encounter:
Climb_the_Ladder_-_Venus_first_encounter.jpg
 

flytandem

Tutorial Publisher
Tutorial Publisher
Joined
Oct 19, 2007
Messages
499
Reaction score
4
Points
0
Location
San Bernardino
Website
www.flytandem.com
Thanks for the kind words.

Tex is right. I usually start from today's date, but all that really means is that there is no special windows really. Almost any time has chances of going from somewhere to somewhere else with some slings.

The scenario here is not a terribly elegant solution. There is some extra orbits involved that to me seem wasteful. But it's all I could do. I think between first and second Venus there was 1+ orbits waiting. Then a full 2+ orbits waiting on the next Venus.

But then Earth was right there waiting making hitting Earth tough. Not enough time to line up the sling easily. I usually like to check arrivals for an Earth sling when the time to Pe in TransX is a multiple of the period of the moon around Earth in Orbit MFD. This is because the moon in orbit causes TransX to give false readings but it's somewhat predictable in the error. So when 2 "months" (moon orbits) away I do a MCC to get the sling at Earth in position. Then advance forward and check it at 1 month from Pe. Then I'll do a save so that if something happens and it's very far off I can estimate and re-fly that last month. Earth is tough.

On this scenario, I spent about 3 hours playing with possibilities. I had tried just 2 venus slings then earth, or 3 then mars before earth. I recall getting a solution there but Jupiter was going to be off. I had a solution with less waiting between venus slings and eaerth slings but Jupiter was a couple years or more before being in the right place so I had to see how to spend more time doing inner planet slings. I knew about Jupiter Saturn and Neptune lining up from previous scenarios earlier this fall.

All in all there is no special insight. It just old fashioned work. One first needs to be able to set up sling attempts quickly. This allows doing lots of them because failures come many times before finding a solution. And the tough part perhaps is when there is a solution that is close (sling radius just a bit below planet surface) ... what does one do to the initial transfer from , in this case, Mercury... do you change the date a bit? or the outward? Sometimes I actually think I can see which one to change but usually I make a change based on gut and it's not what I need so I randomly redo everything with some slight change in initial transfer. Being able to take an initial transfer change and then run up through all the slings quickly, like in just a minute for several slings, helps a lot. And finally keeping track of changes in the initial transfer and what it has done to the arrivals at Jupiter for example is also tough. Many times I make a series of slings and it just goes nowhere and I find I've had a couple hours playing with Orbiter and never leaving the ground. Some of my best Orbiter moments include never launching.
 
Top