You need: MDF board
Assortment of gear sizes
Step 1: Support Disks.
First of all, mark a centre point on your MDF board. Use a compass to draw a circle with a radius of 160mm. Using a band saw, cut the circle out and use a sander to smooth the edges. Trace around the circle and use it to produce another disk of the same size.
Find the centre point of these circles and use it to draw a 5 pointed star on each one. These lines will be used to align the turbine blades further on in the project. Halfway down each line, mark a point and then measure a point 5mm to the right of the line and mark a cross. This is Glue or pin a square onto the centre of each disk to add support to where the axle will be sitting. Finally drill a 9mm hole through both parts.
At the end of this step you should have 2x MDF circles split into 5 segments.