To reduce overall resistance Air Supported Vessels (ASV) utilize pressurized air, generated by fans / compressors, fed into hull integrated cavities, designed to separate a major part of the underwater hull from direct contact with water. For small and fast ASV’s air support can represent as much as 85% of the operational displacement. For larger, heavier and slower vessels the air support ratio is much less.
Proper “air cushion(s)” are created. Concepts with "air lubrication only" are different. Here the idea is to generate a “mix” of air and water to “lubricate” the hull without building up a proper air layer between hull and water. Air lubrication reduces resistance but is far less efficient compared with ASV technology.
In the ASV designs no rubber skirts og bags are needed - a major advantage. The air cavities housing the air cushion(s) are solid integrated parts of the hull, and the cushion periphery is rigid. The patented ASV hulls are designed to reduce motions, minimize air ventilation (in calm waters and in a sea state), and to minimize air ingestion into the propulsion. The invention reduces the wetted surface area substantially. ASV's are safe and predictable and excel with excellent motion damping characteristics. Depending on vessel size, speed, application and operational conditions - all known bows, fore body and propulsion body (patented feature) types / shapes may be used.
The ASV technology and patents cover a wide range of mono and multihull configurations of all sizes. Please study our web site for more details.