The wider starboard hull provides more space for the accommodations, and also makes it easier to access and manage the engine and machinery. The proa hull on the portside is 35 percent narrower, but its actual drag is reduced by approximately 50 percent due to fluid dynamics. A hull that is a little thinner maintains the buoyancy required to keep the boat running true but requires a lot less energy to move through the water. This makes a big difference in efficiency.
Our patented proa design for inboards uses just one engine, one shaft, one prop, one rudder, and one keel—half the typical engine appendage drag of a twin-engine design. The hulls are shaped to compensate for the engine torque. Since both fluid-dynamic and engine-torque forces are proportional to speed, the boat runs straight at every speed. Even better, the single-engine design saves dramatically on machinery weight, which in turn, saves on the required structural-component sizes and fuel needs, and their corresponding weight. This reduces the boat’s weight by around 44 percent. Less weight also equals much less drag. Thanks to solid engineering principles and innovation, our boats strike the perfect balance for the environment: comfortable and efficient.