Ok here you go a car and a helicopter.
CAR RIG:
1) Start with the ROOT bone or joint. Position this at (0,0,0)
2) Extrude or add another bone and call it Body. This will be where you will assign all non moving parts, like the body of the car. If you don't have any moving parts, just assign all to this bone and move to the last step.
3) Next extrude or add joints to the center of the tires. If you have a full engine and trunk compartments this would be a good time to extrude to the edge center of where the hinge should be. The same thing for the doors. If you don't have the need to rig the hood, trunk, tires, or doors then you can skip to the last step.
4) At each of the tires extrude two bones or joints. These will help show you if the tires are rotating in the right direction. They do not get assigned to any part.
5) If you have doors, hood, and a trunk, extrude one bone or joint to the other edge doors, hood, and trunk. Assign your door, trunk and hood to this final bone or joint. Now the bone before this will be your hinge point for opening and closing.
6) Your model in now ready to be exported.
HELICOPTER RIG:
1) Do the above steps but add one more bone right before the Body bone. I call this the Float bone. If you want the Helicopter to appear as it is floating above the ground this is a good way to make it happen. What this does is fpsc has to have a floor segment to move around and this allows for it to do so. Now this bone is also very important for the rest of the animations. If you want to have the helicopter fly above the player's head then you have to think how many segments above the player do I want this to fly and then move that bone or joint to that height and key frame it. It sounds complicated, but it is really not.
2) For the Propeller, there are two different ways of pulling it off. You can Rotate the bone really fast or you can add a plane with a texture that shows the speed. I would use both. Start the propeller rotating and in one keyframe scale the plane with the speed texture to look like the prop has met at full speed. The plane will take four more bones or joints to make it work right.
Hopes this helps and I look forward to what you come up with.
EXAMPLES:
