dsc83818.jpg

Overall view of the first-stage turbine wheel (aka "Wheel Assy, First Stage, Turbine," part number 457089).

The bolts sticking up are to attach it to the second-stage wheel and the bolt holes at center are to attach it to the turbine shaft.

This is the aft side of the turbine wheel. The turbine blades are wider on the bottom than they are on the top. The blades on the second-stage turbine wheel are wider still.