About this 3D model

Primary it was just an excercise for boat designing. Then I thought maybe put an impeller on it, which was created by a friend. He use it for a little truck. Finally we let it swim in a little bowl :-) http://youtu.be/emC3u8R1e5g And here you can view Oliver's impeller-truck :-) http://www.youtube.com/watch?v=h_ZOYQsWkps