[BrianG]

Well, I can't comment on the shaft lengths or the lack of bushing on the wires (QC falling looks to me), but the wind thickness makes sense. Motors of a physical length are all gonna be rated for about the same amount of power. So, for X amount of power, higher winds will draw less current and so the winds aren't as thick. Plus, the fewer wind motors most likely use larger coil wire (or multiple to make up a larger one).