Just nicked this off a web site 4 u:
ZF Trimax from Italy showed their “Ring Drive” with a carved wooden engine simulating the real thing.
This innovation, by FB design in conjunction with ZF, “traps” all the engine’s torque effect within a circle and guarantees perfect engine alignment. This unit has already been adapted to Yanmar engines from 238 to 420 hp.
Having been on a test drive in an RIB33, driven by multiple world champion Fabio Buzzi, I can certainly say that the drive is both effective and smooth.