Five Large Single-Outboard Boats

Simply put, with multiple engines, each engine carries much less load, so they can reach max torque sooner.

At that straddling line of 27 feet, SeaVee does all it can to reduce the total weight of the boat with resin infusion and other advanced composite-­fabrication methods. “We also reduce the deadrise at the transom somewhat to reduce resistance, as well as design the center of gravity to be more forward to reduce hump trim angles,” Caballero says.

The SeaVee 270Z, which the ­company labels a bay boat, can be powered by a single or twin outboards. “When we offer twins, we have a redesigned fuel system to provide for greater fuel capacity and also to locate the fuel load-center more forward,” he says. “It takes a great deal of computational effort and involves designing the boat twice, in many regards.”

Caballero says if engine makers can design outboards that produce very high torque very quickly — through the use of electric-drive motors, ­variable gear ratios, variable-pitch props or high-compression blowers — “that’s when we will see bigger boats with singles.”

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