Unfortunately the translation leads to misunderstandings,
do you mean a reverse flow turbine like this?
https://www.baronerosso.it/modellismo_articoli/show/542/turbina-jmb-t-120.html
I am following with interest, I am "very slowly" building a GR 130 turbine, I always post the steps on another site, if I am allowed I can publish the link.