hi barry,

the swept fan blade appears to be more inline with the needed outcome. it will take me some time to do exact comparisons. but i could do a two rail sweep on the geometry you provided and the airfoils visually seem like what you would want. the a400m blade though has some problems. the second airfoil in is about 90degs from the others. but none of the airfoils seem to have their sweep value. when i try a 2 rail sweep the blade is wavy at the tip and the surface is very heavy. it's really slow in rhino. it seems like the airfoil curves might have too much definition if that makes sense. i didn't seem to have that issue with the swept fan blade you provided. but i will work on my manual models so i can do more of a comparison for you. but it seems like you are getting close. i can visually see you have them onto cylinders which is great. and you have two kinds of profiles which is really useful too.

here is a link to the updated a400m model. there is tons of info in there you can use to compare to. i manually created everything in the file. when doing the 2 rail sweep i ignore two of the profiles that deviate a lot from the curve fit rails. this is to smooth out the wavyness. this is kind of a bad example to use for comparisons. but since you picked it, i went ahead and detailed the model the best i could. i will work on the swept fan blade next. that one is a better test case.