We used a two component rubber resin of polyurethane type for this prototype. The wedge shaped rubber will provide exponential resistance as the prosthetic foot bends forward. The rubber also packs around the metal hinge pin to reduce shear stress.
More info on http://www2.lowcostprosthesis.org/
Pouring the two components next to the polyprop sheet mould Alex prepared
Mixing the components in a figure eight motion
Pouring the polyurethane
Removing the sheet mould
The finished prosthetic foot sketch, the principle looks promising
The foot in standing position
The foot forced forward
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