Web Site and Video
Source ONR/NAVATEK 2004:
Navatek received funding from the Office of Naval Research to convert an existing Navy Surface Effect Ship (SES) to a lifting body ship. Work on this project began in 2000 and resulted in the U.S. Navy large-scale technology demonstrator craft "Sea Flyer." Using a surplus Navy SES-200 significantly reduced project costs. During the two-year project, Navatek removed the existing SES air lift system and all related components, and installed a 160-ton Navatek underwater lifting body incorporating a new propulsion drivetrain (engines, gearboxes, shafts and propellers) within the lifting body. This allows the craft to be operated with variable immersion as speed increases, with the parent hull fully out of the water at maximum speed.
An aft crossfoil was included for pitch and roll control, along with Navatek's proprietary, adaptive ride enhancement system (ARES).
Launched in June 2003 by Navatek sister company Pacific Shipyards International, the 165-foot, 30-knot "Sea Flyer" (originally named "HYSWAC") has a full-load displacement of 320 LT. It demonstrated significant payload-carrying capacity with no degradation in top speed, During successful sea trials in summer 2004, Sea Flyer confirmed on a large scale the major benefits of underwater lifting bodies.