Here are some photos of my modified Telsa turbine. This is a primitive proof-of-concept prototype with 7 posterboard rotors, but it works surprisingly well. The design allows 100% of the disc area to be used, and eliminates the turbulence from the exhaust passing through the plane of the rotors. In the photos I am using a small electric motor as a dummy load to test self-starting. Note the holes in the output shaft to allow exhaust to escape from that side also.
It will work when powered by the exhaust from a vacuum cleaner (using a single-sided De Laval type nozzle) but was being tested with 50 psi of compressed air in the photos. Nozzle in the photos was made from 3/8" OD (1/4" nominal) soft copper pipe. Will take a video soon.