These are vessels are called HYSWAS, Hydrofoil Small Waterplane Area Ship. It is a hybrid ship concept which combines dynamic lift and buoyancy. This provides high endurance and excellent rough water motions and speed. The photos are from the collection of John Meyer, former president of the International Hydrofoil Society. John has published these photos along with text and the complete package on CD may be purchased from the IHS site.
Also see album O - SWATH
Posted by RV 5/29/2013