Yes and no. They have a rotary design but the way it's deigned is like mirrored compared to this design. Mazda * triangular rotor inside a peanut-shaped housing * long, skinny, moving combustion chamber * apex seals inside the rotor X-engine * peanut-shaped rotor in a tri-lobed housing * stationary combustion chamber that's nice and round * apex seals like piston rings.