Design and Implementation of Membrane Hull in Recreational Small Crafts

Based on the tooling for a Sea Ray 240SD, a specific hull structure was designed which utilizes the concepts of Membrane Hull Technology (MHT). This study discusses the effects that the changes in framing and hull shell laminate thickness have on the weight and structural response of the hull, as well as the cost benefits. MHT involves increasing the number of transverse frames and longitudinal stringers while reducing the height relative to traditional hull structures. By utilizing MHT, the area of unsupported spans of the hull shell is reduced, thus allowing for a decrease in hull laminate thickness while maintaining hull strength. The cockpit sole is framed transversely and suspended from the deck, thus isolating it structurally from the hull structure. This combination of hull and deck structure is capable of much higher deflections without failure compared to that of a traditional hull structure, thus increasing elastic energy absorption and decreasing shock loading.