Skip to 1:15 to see the square wheeled trike on the inverted catenaries. Oh, and now you know what catenaries are. So, that's a bonus.
The obvious thing I realized is that there will not be as smooth a ride with square wheels as the round ordinary ones, because of the air filled tube of the wheel on the rim. That square wheel doesn't have the air filled tube to give a cushion to the hard rim, and no suspension trike.
So, this was not all that cool, but I was interested in the top photo potential for a smooth ride, because it might be possible for solid wheel on solid surface to be perfectly smooth, like a train on rails. Just not likely
Notice that at the beginning the guy on the square wheels has one pedal almost at the bottom of the circle and the other not quite over the top. On a normal bike he would go nowhere.
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