If you use a sweep, try using a guide curve to orient your section along the sweep path. Use pierce constraints in your section sketch to constrain your sketch to the path and guide curves.
I could be the world's greatest underachiever, if I could just learn to apply myself.
I agree with Shaggy, a loft should work here. Just set up your second section, then dimension your second section to 12 degrees on a new datum plane 60mm down the path. That way you will have control over both of your end sections. The middle should fill itself in.
I created the 160x96 rectangular sketch and rotated the sketch in 3 degree increments with 15mm increments spacing up to 60 mm that resulted with the final 12 degrees. Than added "curve through reference points" on each corner of the incremental rotated sketch. Than swept the rectangle profile and a 60mm path with 4 guide curves.
The only inconvenience was that I now needed to array the feature 3 times at 120 degrees, but SW would not array the feature with guide curves.
The resulting part is a 3 bladed wind turbine rotor hub.
To get the circular pattern to work with a "sweep with guide curve" don't you just have to turn on the "geometry pattern" option in the sweep function, or am I getting this confused with something else?
What about not merging the original blade to the base part (so you have two bodies) and doing a pattern of bodies instead of a pattern of features?