[Loser]

an e-mail reply from Aaron
Those three types of engines give you additional movement for your ships. You need to make sure that all of the engines on the ship are of the same type to receive the bonus.

The idea behind the engines are from science fiction books and magazines. Contra-Terrene is the use of anti-matter that is brought in contact with normal matter to create a powerful energy release. Jacketed Photon it a method where photon movement is harnessed to propel the ship forward. A Quantum engine uses a quantum singularity (a tiny black hole) to bend gravity and propel the ship forward.

Aaron