Thats the blade complete, the next few steps invole drawing the hub and a suitable tower, if you like you can draw them as seperate parts and join them in an assembly file which was what i did for printing however for the purposes of this lesson i will draw the hub here in the same drawing. I might add as we were doing this as part of a group of 15 we only needed one tower and the each of our hubs were designed to fit onto the tower.
draw a circle big enough to fit the three blades. Next use 'Features & 'Extrude Boss/Base' in both directions. The 'Fillet' or 'Dome' the front side (the same side as the flat side of the blade).
Using 'Circular Pattern' select the 'Bodies to Pattern' i.e. the blade to make our 3 blade turbine we are all familiar with.