There are different types of propellers, wings go on the birds of course. There are more than one way that can be accomplished. Different jigs, different materials.
Propeller or fan type are used on mechanical ones. There are a few ways those can be accomplished as well. Different jigs. Different materials.
Figuring out the wire bends for the mechanical ones is interesting. (I ask my husband to do it)
There are also different types of bases needed.
Painting takes a while.
I do make a stand for them to be put on indoors during winter and bad weather.
Class will require homework for preparation.