Well Sir, I finally got a few seconds to do these FEA's on your hub.
I installed some 'ball bearings' of sorts and then a shaft/stub where the
blades would sit. I loaded this stub two ways. The first was radially
out from the center w/ a 16,000 lb load. And then on a flat face which
was 24" from center I put 325 lb's force perp to the plane of rotation.
I put symmetrical loads on either end of the hub and then used Larry's
6061-T6 Alum material properties to test it.. 32seconds later it gave me these
I think that the area where it neck's down is really the only area
which might need a little more material.. the rest looks like it could
fly. If it was made from Alum.. that is..

Larry also gave me some material data on composites so I did these
w/ Eglass. Now the data did not provide a yield number for the material
so it doesn't show whether it's exceeded it , but hopefully these will be
useful to you as well..

Anyway if you want me to do any more just fire away.. it takes longer to copy and
paste the screen shots than it does to do the FEA part of the job..

Jarrett

Thanks Jarrett. You do great work.

Looks like it is over designed just about everywhere except the necked
down area. Time to save some weight :) I'll go with the e-glass results.