Update Scene

I forgot to save the scene. The copter has a new diamond on top so you
can tell its orientation.
Use Correct Thrust Vector

The thrust vector is now the normal. Also, counteract rotation on each
frame that didn't have user input for rotation.
Add Balance

After rotational input stops the copter begins to right itself. There is
a wiggle at the end, and some odd behaviours.
Add Controller Support

Use the Xbox 360 controller. This breaks keyboard support.