The use of a single engine makes an enormous contribution to weight savings on a craft of this kind. And when those weight savings are combined with lightweight advanced composite construction, a superior hull form and a high efficiency drive there are no sacrifices in performance. The use of a compact, reliable 440hp Yanmar Diesel  offers a further opportunity for weight savings.

The Nava 38's "Power-Vent" Integral Vented Surface Drive reduces water resistance, improves the angle of thrust, decreases draft and simplifies the drive train. The single diesel / surface drive combination surpasses the efficiency of any other power / drive system available.

More on the integral vented surface drive click.
   
More on surface drives click here.

More on single diesel power.

Facts on the efficiency of other drive systems.

What about damage from floating debris?