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Hey omarfarouk, the design of the pitch mechanism has been one of iterations. The first iteration was an active system that used a raspberry pi/RPM sensor/Stepper motor and the mechanism to control the pitch, I've attached a picture. This worked really well but was expensive and used some of the energy generated and therefore lowering the overall efficiency of the turbine. I took the learning from the active system and made it passive with the pitch weights. Most of the development work was done by calculation and then a digital mock up in solidworks followed by test pieces and a rig. Once I knew the design worked I refined it to remove as many parts as possible. On the Mkiii i'm just finishing up there are further improvements to reduce the play in the system and reduce the cost of the bearings whilst making it easier to lubricate once installed not to mention 10x more power!!! The mechanism although it may look straight forward was difficult to lay out for the first time and getting the right amount of movement in such a small space was a challenge. Sorry I don't share the files as they are my IP.