Light vessel for use as e.g. raft, house boat, sail boat, has vessel components e.g. sail mast, constructed from hollow structural members defining floatation chamber

摘要

Each of vessel components, such as a sail mast, a horizontal bar, a lifting element, etc., is formed of hollow structural members defining a floatation chamber. The structural member is formed of two walled fabrics, while the chamber is filled totally or partly with water.