My colleagues were having great time constructing a air/water scooter, which is the scooter that can fly on air and run on the surface of water. Currently, they are able to make it fly (without passenger on it), but the instability of the flight is still very obvious. However, running on the surface of the water is something to be worked on. As of now, their model looks more or less like a helicopter but w/ 4 sets of motors and blades.
May be using servo to control the orientation of the motors should help, but we still can't get rid of the blades since they are pretty long... i will come up w/ their pictures of prototype soon