What's happening in the innerpart is just guessing.
My idea is to keepit open to have a "crossflow" effect.
Just like any savonius.
my rule is to interfere with airflow only when you can
expect positive drag or lift.
What I should do is to build some rotors based
on the same principle but with some parameters of the
geometry varying and mesure performance.A hugh program.
I'm on my way for the dynamometer that goes with my
setup.I have some ideas about it and I'm sure
it will be loads of fun.
A shame I'm so slow.
cheers,
stonebrain