Peter Jackson, "Lord of the Rings" director, just bought a G550... so he can fly nonstop form NZ to Los Angeles.
But he also owns "The Vintage Aviator". Restores and builds replica WWI aircraft.
Now, they're building copies of WWI engines.
Here is one of their "Oberursel" Rotary engine with a video of it running. This is NOT a Mazda.
For those that don't know, with a rotary engine, the crankshaft is stationary and is bolted to the firewall. The cylinders rotate around it.
The opposite of the well-known radial engine.
This is VERY cool.
Playing Oberursel Engine Running | The Vintage Aviator