Each ship is equipped to handle two types of generators. Engines to make your escape possible when needed, and shields to protect you in a dog fight. Each ship has a set number of generators it can hold, but don't despair. If you would like more shielding than your ship will allow then equip your drones with shields as well. Engines can not be outfitted on shields. All extra's from your hangar can also be equipped on your drones if you so desire.
Below is listing for both the speed generators and the Shields available to you.