Back to the original question. How much simplification do you want. The ultimate in simplicity is an untwisted,untapered blade. And they work very well,given a good profile. It also has got to be much easier to get them all the same shape and weight.than hand carved twisted blades. If the outer two thirds of the blade provide 90% of the power,and outer one third 50%,with little twist in this area, then why bother with twisted blades at all. It may make aerodynamic sense to have some taper giving a higher aspect ratio nearer the tip which is travelling faster,but it's debatable how much difference this might make. The setting angle can be as small as 4 degrees for speed with ,maybe wedges glued on near the root to increase the angle and assist start up. I respect the knowledge and experience expressed in above posts,but even though I am an experienced woodworker/boatbuilder and have the neccesary tools, I can't see myself carving twisted blades any time soon.