Delta IV Heavy Boosters boosters are a pair of mid-sized, liquid-fueled boosters used to complete the Delta IV Heavy rocket. It is the only pair of boosters in Space Agency that will cut thrust if you release the engine control button, due to them being liquid fueled.


  • Although the boosters are classified as medium-sized, they are actually the largest boosters in the game, being a bit bigger than the SLS Solid Boosters and the SLS Advanced Boosters.
  • The boosters actually can be restarted, making them the only boosters that can be restarted in SA

Delta boosters in orbit

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