With components from toys, low tech sheet metal parts and the remarkable universal qualities of the PET bottle we set off to develop this low cost wind mill. Within the design process we found a perfect blend between empirical and theoretical development. The PET 1,5 ltr bottle was the starting point because it is everywhere. Even though it is criticized to pollute our oceans and you can find it lying around even on the highest mountain it is one of the best designs ever made. Being lightweight it saves on fuel for transport, its contents is extremely well protected and therefor safe to drink even after long storage and when recycled its materials are of good value. What inspired us greatly was the screw cap. If we bring a screw cap from our home and bring it to a small village in the Andes it will fit! It is one of so few universal standards. A remarkable achievement and utilized in this wind mill.