Small engine

"So you have a fancy reactor that creates unlimited glowing hot plasma and you want your ship to move. If you're on a budget and you don't mind some noise these devices will get you where you need to go. They use electromagnets to throw plasma off the back of the ship. It may be ancient technology, but if it works you don't fix it."

The small engine requires 1 of the tiles at its rear to be touching an edge in order to be placed.