Drop the throttles and the supercharged outboards do their thing. Thrust is urgent and, as mentioned, planing performance is fine. It takes 4,500 rpm to really hold plane, and that’s about 33 mph, a nice cruising speed on smooth water, but it would be even better to cruise efficiently at a slightly slower speed. With the bonus blade area of its twin-prop drives, the Horizon 350 with sterndrives will cruise at 28 mph, a benefit when seas are choppy. Which is not to say the Horizon is a rough ride. We charged through a stiff Great Lakes chop with minimal drama and stayed dry. Sometimes it’s just nice to throttle back and relax.