Because water and air present similar challenges in control, stability, electronics, hydraulics and propulsion, Boeing began adapting many systems used in jet airplanes for hydrofoils in the 1960s. The result is a highly maneuverable and comfortable commuter boat that combines aerospace technologies with the best features of a marine vessel. The water jet-propelled boats use fully submerged, computer-controlled steel foils on an aluminum hull. When foil-borne, the vessel produces a very small wake.