How to Build a Thousand Ton Rocket in Kerbal Space Program

You're playing Kerbal Space Program and you're bored sending up little rockets. You want something bigger, better, something... massive. Start with step one to learn how to build a thousand-ton rocket (it's actually 1063t, using a 4.5t test payload) in Kerbal Space Program, using only default parts.


  1. 1
    Create your payload. Create a payload stage that goes on top of the rocket. You can use a Rockomax X-200 8 fuel tank as a test payload.
  2. 2
    Underneath your payload, add a Rockomax brand decoupler. This should be the first stage after the payload.
  3. 3
    Under the decoupler, add a Z-4k battery bank, an Advanced Reaction Wheel module, large, an RC-L01 Remote Guidance Unit, an FL-R1 RCS fuel tank, and 4 radially attached RTG's. These are your control circuits. They can be omitted if you are sending up a manned mission.
  4. 4
    Under the control circuits, add a 3.75m fairing. Construct the fairing over the control circuits and payload. The fairing should be the second stage.
  5. 5
    Connect the payload and control circuits to the base of the fairing using struts. This stops them from wobbling everywhere.
  6. 6
    Under the fairing, add a Kerbodyne S3-7200 fuel tank. Radially attach 4 RCS thruster blocks at the top and another four at the bottom.
  7. 7
    Under the fuel tank, add a Rhino engine. This should be stage 3.
  8. 8
    Under the engine, add a TR-38-D stack decoupler. This should be stage 4.
  9. 9
    Repeat the last three steps, but replace the fuel tank with an S3-14400. The Rhino engine on this stage should be stage 5 and the decoupler stage 6. Radially attach 4 Stratus-V Cylindrified Monopropellant tanks around the middle of the fuel tank.
  10. 10
    Under the second decoupler, place two S3-14400 fuel tanks and a Mammoth engine. Place four RCS thruster blocks around the top and bottom of each tank (so 16 total on this stage).
  11. 11
    Add four TT-70 radial decouplers to the bottom tank. These will be referred to as north, south, east and west. You need to split up the staging, so that east and west form stage 7 and north and south form stage 8. The Mammoth engine in step 10 should now be stage 9.
  12. 12
    To each decoupler, add an S3-14400 tank. Add another one on top. Add a Mammoth engine to the bottom. Rearrange the staging so that these Mammoth engines are part of stage 9 (same as the central engine). On top of the second tank, add a Rockomax-Kerbodyne adapter, an FL-R1 RCS tank, and a Protective Rocket Nose Mk7. These are your booster rockets.
  13. 13
    Add in the struts. There should be two connecting the top tank of each booster to the top tank of the central rocket, and one connecting the nose cone of each booster to the tank in step 6.
  14. 14
    Place RCS thruster blocks on the boosters. You should place four sets on each booster: one at the top and bottom of each fuel tank. Each set should be one block on the side facing away from the central rocket, and one ninety degrees around in either direction (so 12 total on each booster).
  15. 15
    Place the fuel lines. Don't use symmetry mode for this, it goes a bit funny. For each booster, you'll need to place two fuel lines, one for the top tank and one for the bottom. If you try with only one line, it may make the fuel flow go a bit dicky. Connect the north booster to the east booster, and the south booster to the west booster. Then, connect the east and west boosters to the central stage.
  16. 16
    Finally, place the launch clamps. Try two on each booster. The launch clamps should be part of stage 9.
  17. 17
    Prepare the launch pad. Liftoff in ten... nine... eight...


  • If your rocket starts wobbling and flexing, add more struts!
  • Don't start turning your rocket before ejecting the first set of boosters. If you do, they can smash into your rocket and cause damage. The instructions assume that you are turning to the east, so the north and south tanks are ejected first. If you're going north, rotate the rocket through ninety degrees in the VAB before launch.
  • This thing has a ridiculous amount of delta-v. You can make it to Jool using a very inefficient transfer, with the test payload, using just the main rocket engines. In theory, this could get to Eeloo and still have fuel left over.


  • This rocket has is very large and may cause computer lag. That being said, it's tiny compared to some rockets I've seen people build.

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