Rotary (Wankel) working paper engine model

[Petr]

https://www.youtube.com/watch?v=QDR40Eyuu7w

+ YouTube Video

The model is made of paper except of one transparent plastic cover. It could also be from paper, but it is possible to see insides now.
Even though that the model works in some way similar to turbine, it has all functional parts of prototype - rotor, fixed gear, crankshaft, absence of valves. So I believe it can roughly be called a model of a pistonless rotary engine.