7 rotors

A 3 rotor and a 4 rotor engine. The 3 rotor is an engine swap from a Mazda Cosmo. The 4 rotor was a "weekends" project.

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4 rotor rotary engine in a BMW - RX7 motor drag racing
4 rotor rotary engine in a BMW car. Drag Racing

Handbuilt 4-Rotor Engine
This was a project that took about five years of weekends to put together. There was a lot of trial and error as jury-rigged parts were improvised and revised, leaks were identified and plugged, and byzantine electrical diagrams were decoded. It still does not run smoothly, as there likely is a problem with the intake system that has prevented smooth timing at idle. But she runs! lots of people wanted to know where the E-shaft came from: it was custom ordered from a shop in New Zealand.

Rotary engine
rotary engine, 6,000 rpm

Single rotor lawn mower-YouTube.mov
Amazing single rotor lawnmower