Cummins Inc., a manufacturer of diesel engines for the commercial marine industry, announced the availability of the QSK50 marine engine for variable speed diesel electric (VSDE) applications. The 50-liter platform has been used in traditional fixed speed diesel electric applications, as well as traditional propulsion and power generation, since its launch in 2006. “Cummins will play a critical role in the advancement of this more efficient technology, supplying engines to system integrators for packaging into complete variable speed diesel electric packages…