1.There are no appendages under the hull.Having no appendages reduces the drag on a vessel，therefore making higher speeds possible with less horse power required. Less horse power equals less fuel consumed
2.The propeller can be placed on the surface of the water to produce a shallower draft on the ship, which makes the surface drive perfect for shallow water applications
3.For ships of the same size, the surface-driven propeller is larger than the conventional propeller.This is beneficial when undertaking close quarter handling in that the propeller at that stage is completely submerged and the operator has the advantage of greater thrust forward and aft