Here is our first finished test foot. The lower half is currently made from MDF, which will ultimately be cut from 25mm 5083 aluminium. The tyre we have been suing has been sliced in two, and I intend on gluing a foot pad to the bottom of the tyre where the rim would usually be. This will create the completed pill shape, however, we are currently slightly concerned about the strength of the glue?
I have managed to get the ball join further down into the foot, I hope this will improve stability and reduce the chance of the ankle buckling over. The ball joint could be taken further into the tyre, but this would reduce the foot compression range, which is currently about 50mm.