 Each strut is attached to a -long underwater tube that contains the engines.Four propellers are at the front of the tubes, which is more stable and allows for better control at high speeds; the propellers funnel air down through the struts, creating a gas bubble around each tube (the cavitation effect) for reduced drag and smooth motion.Propulsion on the prototype is provided by two T53-703 turboshaft engines providing 2,000 horsepower, there are plans to later adopt the General Electric T700 turboshaft engine.