I wanted to do a small project in the Unity 5 game engine to learn some of the basics. This it what I came up with after around 10 hours of work.
It is a simple FPV quadcopter racing simulator. You control a small and agile quadcopter using the analog joysticks on a game-controller. A real RC simulator transmitter can also be used. It is possible to fly both in first person or in third person. There are not many quadcopter simulators or games out there, maybe it would be interesting to add more features and make this a more like a complete game/racing experience?
Download here: http://quadsim.brinkeby.se/