Rocket fuel is crafted with 1 bucket of water, 1 fire charge, and 1 gun powder. Once crafted the player will enter their Spaceship. You can access the Rocket Fuel GUI by pressing the "Open Spacecraft Inventory" button while sitting in the spacecraft, default F key. Once the rocket fuel has been placed in the slot hit the space bar and get ready for take off!
(this form of fuel has been removed in V0.0.10)Edit