Thrusters are what give your ship the ability to move. Without any, your ship will fall to the bottom of the map and you will not be able to steer it.
There are 2 types of Thrusters, Thruster (Starter) and Thruster. Both of these are controlled by the Helm
Your ship will start out with 2 Starter Thrusters which never require refueling! You can never make more of these so do not shred them with the Item Shredder. Unlike the Thrusters, These can be placed on the corner of a ship to provide more angles of thrust. (See Thruster Placement below)
Thrusters can be crafted using Machine Fabricator. Unlike the Starter Thruster, these take up 3 blocks of space on any outside wall of your ship and burn Fuel to be active.
Thruster PlacementThruster placement determines the angle and power of thrust provided.
Due to this it appears from my testing that traveling at an angle (up and left, or similar) usually provides more thrust if thrusters are placed on each side of the ship.
Explosives can be used directly as thruster fuel but do not burn very long. Burn Time: 60 seconds