About this 3D model

It turned out that it don't runs straight ahead if driving this boat with an impeller. It runs more like a drunken sailor ;-) Therefore I designed a kataraman that has much more directional stability. This time I got something bigger for testing - a bath tub ;-) http://www.youtube.com/watch?v=kuZudg1GadM I used the same drive again that Oliver designed for his impeller-truck :-) http://www.youtube.com/watch?v=h_ZOYQsWkps