There are probably many ways to attach a CD to a KidWind Wind Turbine Generator with Wires (KW-GEN) for the Science Olympiad Wind Energy event. One simple way is to use a 3-D printed hub.
We have designed a hub that you can 3-D print and have uploaded it to Thingiverse.com. You can find it here:
Simply snap the CD onto the hub, and push the hub onto the generator shaft. Friction will hold the parts together.
You are free to modify this design. If you develop a better method that can be 3-D printed, we invite you to upload your design to Thingiverse and tag the design with VernierST.