Hat off to you Ernest for giving it a
try.
Looking at some of the impellers in the
article - it would appear that the size of the your blades,
the distance between rear and front rings and their strength
simply was insufficient to stand up under gyroscopic,
centrifugal and air loads (you say you already know that?).
Seriously, I would say the structural rigidity and strength
simply was not up to the loads - most of those impellers are
cast or machined from a single piece.
Next try might look something like this?
a bit less bite (less distance between your rings) would add
to the rigidity and strength - I really like the idea that
you gave it a try. Clearly there is sufficient power there
to do something with the right impeller. I certainly liked
your concept and placement of the impeller.
It took me about 5-6 intake experiments
to finally get it right - so don't quit!
Ed