The most unique of its design innovations was its two-speed automatic gearcase. The engine drove two, contra-rotating props, like the MerCruiser Bravo Three sterndrive. Unlike the Bravo Three, the props were sequentially shifting: On initial acceleration, one prop would free-wheel while the other spooled up quickly. A computer-controlled hydraulic clutch system automatically engaged the second prop when the engine reached a pre-set torque. This resulted in outstanding hole-shot acceleration.