Monday, July 1, 2013

Kerbal Space Program: Landing and Returning from Eve (using kethane jets)

One of the most difficult tasks in the game Kerbal Space Program (KSP) is returning a vessel from the surface of Eve.  With Eve having 1.7 times the surface gravity, and nearly 5 times the atmospheric pressure of Kerbin, this is no mission to be taken lightly.  And although it is Kerbin's closest neighbor, it generally requires more Delta-v to reach than Duna due to its 2.1 degree inclined orbit around the sun.  But as one of our presidents would have put it, "we choose to go to Eve and do the other things, not because they are easy, but because they are hard!"

Mission Parameters

  • Construct a ship in low Kerbin orbit (LKO) capable of taking Jebediah to the surface of Eve and back home to Kerbin.
  • Eve lander will use the KE-J65 turbines (kethane atmospheric jet engines) for a vertical takeoff.
  • Once leaving LKO, no new parts can be added to the mission, including refueling tankers.
  • May refuel by mining kethane.
  • The ship will consist of 4 parts...
    • Eve Lander - for getting Jeb to the surface of Eve and back into orbit.
    • Kethane Miner - to mine kethane on the surface of Eve's moon, Gilly.
    • Kethane Probe - small satellite to be placed in Gilly orbit to find deposits of kethane.
    • Mothership - the ship that will hold most of the fuel and engines for getting this mission where it needs to go.
  • Game version - KSP v0.20.2 - the most recent as of June 2013
  • Mods Used
    • MechJeb 2.0.7 - Used for extra information only, no autopilot.
    • Kethane 0.6.1
    • KSPX 0.2.2 - I had not intended to use any other mods, but I accidently used one part from this, a 2m to 1m structural adapter used on the tops of several fuel tanks to make them look a little less ugly.  I suppose it could easily be substituted for a stock nose cone; but by the time I remembered that it was a mod part, I was already in orbit around Eve and did not want to restart.
And finally, Jebediah put in a special request to land on Gilly as well (as he couldn't allow himself to be so close to a world without touching it).  Since putting a second lander can on the Gilly miner was out of the budget, we told Jeb that if he wanted to touch Gilly, he would have to do it himself.  So we will also watch as Jeb attempts to land on Gilly, and return to the ship, using only his EVA jetpack and no instrumentation other than his communications with the computer on the Mothership.

Imgur Links

Design Phase
Phase 1 - LKO to Gilly Orbit
Phase 2 - Mining Gilly and Jeb's EVA Landing
Phase 3 - More Gilly Mining
Phase 4 - Landing on Eve
Phase 5 - Return to Orbit
Phase 6 - Return to Kerbin

Future Planned Missions

 This whole mission was pretty much a practice for my planned Grand Tour.  Will need to do some design tweaking before that however.  I would love to make that Eve lander much lighter, but I think I am definitely on the right track with these kethane turbines.

I also want to do a single-launch Duna/Ike mission that will be a test of my all-purpose lander for the Grand Tour.  This mission will also include bringing a rover down with Jeb to the surface of Duna, picking that rover back up, then taking that same rover to Ike.