u/Efficient-Reach-454

I always see this in the wikipedia section of pistonless rotary engines, and I wonder why it isn't popular? Is it because it also plague with the problem with the rotary also?

So how does this work? It's like a supercharger mix with a turbocharger? It uses a belt but also exhaust gases, but it isn't separate? Isn't that gonna mix into the fresh air? I know there have been cars with this, but today there's no manufacturer making this, is there a reason why? Are other popular superchargers like centrifugal or twin screw better than this thus making this obsolete? Or is there more to it that manufacturers avoid this type of supercharger?

I have watch a few clips of opposed piston engines and I have seen two very common ones, the first one uses two crankshafts that are connected by gears and are inline like the Achates engine or Fairbanks Morse designs, the second common one was the one with only one crankshaft but uses rocker arms and it's similar to a flat engine appearance wise like the commer ts3, so in my curiosity why do I see the Achates version more popular than the commer ts3 which is also a proven version of an opposed piston engine? What does the Achates have an advantage that it's still being tested by Achates and the US Military while the commer ts3 type doesn't?