Small Airplane Propeller

This is propeller i made for my Continental C90/O-200, as no one could give me propeller to cut it in 10 pieces and take dimensions, i used what I could from Internet. Propellers like these are used for airplanes such as Cessna 150 etc, with air cooled engines. The fact that its air cooled means propeller it self has 2 main reasons to cover: 1.) To make airplane move 2.) To cool the engine That leads to part where propeller is kinda in 2 parts; part closer to center is made so it cools engine, outside part is made to make airplane move. There are basically 2 kinds of propellers, first kind is like I have now, its for lower speeds but great torque and other kind, with more aggressive attack angle is made for greater speeds, but with that - lower acceleration. I will maybe make guide with things I learned when I made it and things to keep in mind and few tricks aswell, later on, when I will have some time. Materials used to make propellers like this are different, but it goes all the way from wood to carbon, covering steel in the middle. Diameter of propeller is 1860mm. It does not have changeable pitch, as airplane is small, engine doesn't support it and it just doesn't need this function, as that would only make things way more complicated and heavy.