Challenge Get your Deltaglider from the ISS to Mir.

dgatsoulis

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Use the scenario posted below and dock with Mir. (No refuelling or scenario editing). Take all the time you want.

Code:
BEGIN_DESC
Undock from the International Space Station and dock with Mir.
END_DESC

BEGIN_ENVIRONMENT
  System Sol
  Date MJD 51982.029
END_ENVIRONMENT

BEGIN_FOCUS
  Ship GL-02
END_FOCUS

BEGIN_CAMERA
  TARGET GL-02
  MODE Cockpit
  FOV 60.00
END_CAMERA

BEGIN_HUD
  TYPE Docking
  VIS
END_HUD

BEGIN_MFD Left
  TYPE Docking
END_MFD

BEGIN_MFD Right
  TYPE Orbit
  PROJ Ship
  REF Earth
  TARGET ISS
END_MFD

BEGIN_VC
END_VC

BEGIN_SHIPS
ISS:ProjectAlpha_ISS
  STATUS Orbiting Earth
  ELEMENTS 6734919 0.0009 74.513 169.034 328.305 122.0 51544.5
  AROT -110.00 -15.00 -84.00
  DOCKINFO 1:0,GL-02
END
Mir
  STATUS Orbiting Earth
  ELEMENTS 6671000 0.0006 3.5 0 0 0 51544.5
  AROT 0 -45 90
END
GL-02:DeltaGlider
  STATUS Orbiting Earth
  DOCKINFO 0:1,ISS
  NAVFREQ 2 466 0 0
  PRPLEVEL 0:0.071822 1:0.033333
  GEAR 0 0.0
  NOSECONE 1 1.0
  AIRLOCK 0 0.0000
  SKIN BLUE
END
END_SHIPS

Comments/hints:

Obviously this is a plane change challenge.

Plane changes can cost alot of fuel if they are not done properly.
In this case the ISS and Mir have a Relative Inclination of 77.95 degrees, so the dV required (for a direct plane change burn) would be:

[math] \Delta_V[/math] = Required dV
[math] V [/math] = orbital velocity at time of burn
[math] \theta [/math] = Relative inclination

[math] \Delta_V=2\cdot\ V \cdot\sin \left(\frac{\theta}{2}\right)=2\cdot\ 7700 \cdot\sin \left(\frac{77.95}{2}\right) = 9686.31 m/s [/math]
In this challenge you have just 1/3 of the -direct plane change required dV- in your main tanks and 20 kg of RCS fuel.

Hint: An Earth orbit provides you with an advantage that none of the other inner planets have.
 
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Zachstar

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I think I know how this one works :tiphat:

And it is one of my favorite uses of said fuel so awesome challenge there!

Good luck to those daring to face the challenge!
 

sitha241

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Less than a ton of fuel??I don't have an idea but I will think about it :) nice challenge :)
 

Cras

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a very cool challenge here. I see how you can do it. Not sure if I have said skills to pay the bills, and actually pull it off however. Something I have been meaning to figure out how to best do myself actually. I am very interested in seeing how you all go about this.
 

sitha241

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Hm an advantage only Earth offer..I do not think rotation of planet is answer cause mars has almost same I think..venus has thicker atmosphere...I played scenario on time warp and had close pass by mir (130 km i think) but relative velocity is to high..damn I am student of physics and can't think to an answer :(
 

flytandem

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Tried three uniquely different ways. One of them didn't have enough fuel. The other two worked with 50 m/s spare dv on one and 569 m/s spare on the other. I suspect the latter with so much spare dv was not the intended solution. Fun challenge.
 

Goth

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After the "plane change trick" it seems I don't have enough fuel for the rendezvous.
Still trying.
 

asbjos

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Now this is a fun (and unique) challenge.

I can think of a way to do it easily and cheaply (fuel-wise), in a handy image so it doesn't spoil stuff. (hint hint: spoiler tags :))

http://i.imgur.com/AnT0L.png

1st paragraph: this is what I thought (and did) too, but I didn't have enough fuel to rise my orbit again afterwards.

2nd paragraph: it is enough, and I guess this is what dgatsoulis hinted to and did, but I do not have enough knowledge to do this. I'll also guess that this is what flytandem did when he got 50 m/s left of fuel...

3rd paragraph: I really doubt that this was intended by dgatsoulis...

4th paragraph: I also think that this is a possible way to do it, and I belive that this is what flytandem did when he got 569 m/s spare of fuel.

All in all, you have some interesting thoughts.
Thank you to "dgatsoulis" for this interesting challenge:thumbup:
 

Goth

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Rtyh-12, you are in the wrong direction (at least IMHO). I also tried those ideas, but then I discovered that there is another way that will let you save A LOT of fuel. The solutions you provided cannot be applied with the fuel provided by the challenge.
EDIT:
ok, the last one maybe it's possible.

---------- Post added at 22:02 ---------- Previous post was at 21:52 ----------
2nd paragraph: it is enough, and I guess this is what dgatsoulis hinted to and did, but I do not have enough knowledge to do this. I'll also guess that this is what flytandem did when he got 50 m/s left of fuel...
IMHO it's not possible because you won't have enough fuel for the rendezvous.
 
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flytandem

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Correct on all 4 paragraph comments. :thumbup:

1st paragraph: this is what I thought (and did) too, but I didn't have enough fuel to rise my orbit again afterwards.

2nd paragraph: it is enough, and I guess this is what dgatsoulis hinted to and did, but I do not have enough knowledge to do this. I'll also guess that this is what flytandem did when he got 50 m/s left of fuel...

3rd paragraph: I really doubt that this was intended by dgatsoulis...

4th paragraph: I also think that this is a possible way to do it, and I belive that this is what flytandem did when he got 569 m/s spare of fuel.

All in all, you have some interesting thoughts.
Thank you to "dgatsoulis" for this interesting challenge:thumbup:
 

Goth

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The link is under a spoiler warning.
The solution is correct, I PMed him.
All the others solutions have already been posted.

I don't see the problem here. My question was almost rhetorical. ^^
 
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jedidia

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Tried three uniquely different ways. One of them didn't have enough fuel. The other two worked with 50 m/s spare dv on one and 569 m/s spare on the other. I suspect the latter with so much spare dv was not the intended solution. Fun challenge.

Oh, really, anyone can do it when they fly tandem. that's cheating, that is :p
 

blixel

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Sooooo close. I just need another thimble worth of fuel!

6Absz.jpg


(I hope this isn't considered a necropost. Challenges don't have an expiration date.)
 
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