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In this 90-minute documentary we take a deep look at the history of how Felix Wankel invented the rotary engine that bears his name, we review the theory that supports it, talking without mathematics about trochoids and envelopes. We also explain how it works and introduce a review of some of the cars that made this engine famous, with special focus on the Mazda RX-7 through its three generations, before analyzing how its future looks. Interesting links: Our USPI of the RX-8: • #PowerArt - #USPI: Mazda RX-8 - S01-E17 Video with spy photos of the mule of the new rotary: • Guille opines - The return of the Mazda... Combustion engine cycle theory: • PowerArt - How a combustion engine works...