The shape of Mercedes combustion recess is what Yanmar Diesel called an 'LDR', isn't it?
Some 12B Mazdas had this recess shape, along with double side seals.

An MDR recess vs an LDR or a Rotor having the recess close to the trailing edge
modifies HC, CO, and BSFC, but this varies according to the individual type
of engine, choice was always after extensive experiments,
MDR rotors were probably chosen as a compromise
between BSFC and emissions under several rpm and load ranges.

Regards, + Salut

Jose Gros-Aymerich

 Madrid, Spain

There is no need to compromise BSFC as emissions can be eliminated by
the exhaust system.

Wankel diesels are dead ends as it is too difficult to get the compression ratio high enough.

Paul Lamar

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