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    <title>Transport Research International Documentation (TRID)</title>
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    <copyright>Copyright © 2026. National Academy of Sciences. All rights reserved.</copyright>
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    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>SEMISUBMERGED SHIP WITH BOW IMPACT ALLEVIATOR</title>
      <link>https://trid.trb.org/View/65386</link>
      <description><![CDATA[An improvement is provided for the semisubmerged ship which reduces the impact effect of large waves when they strike the ship's platform. A semisubmerged ship by having at least one submerged elongate hull supporting a platform above the water's surface by at least one water-surface piercing strut is capable of high-speed operation and a large wave directly striking the platform could damage the ship. Including pairs of lifting hydrofoils on the upper reaches of the forwardly disposed water-surface piercing struts raises the platform to reduce the impact force and the possibility of damage to the platform. Similarly configured bow-shaped projections on the underside of the platform generate lifting forces which raise the platform over the waves to reduce the impact force. Designing the bow shaped projections to be cusp-shaped also helps them cleave into the waves to further reduce the impact and the effects of impact on the underside of the platform. The concave surfaces of the cusps translate the impacting force to tensile stresses in their sheet-metal surfaces. These sheet metal surfaces are capable of bearing greater tensile forces without yielding whereas conventional flat surfaces are deformed and end up irregularly shaped.]]></description>
      <pubDate>Wed, 16 Feb 1977 00:00:00 GMT</pubDate>
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      <title>PRESSURIZED SHIP STRUCTURE FOR SLAMMING LOADS</title>
      <link>https://trid.trb.org/View/63419</link>
      <description><![CDATA[The patent relates to a device whereby the underside of a semisubmerged ship or catamaran-type vessel's platform is protected from the slamming loads created by impacting waves. Elongated flexible chambers are fashioned from a flexible fabric and are arranged in a side-by-side relationship on the platform's bottom. The flexible chambers first resiliently absorb the forces of the impacting waves and then translate these forces into tensile stresses borne by interposed, rigid, structural members. The flexible fabric chambers and rigid structural members do not over- load the platform yet do provide a higher degree of protection for the platform.]]></description>
      <pubDate>Sun, 16 Jan 1977 00:00:00 GMT</pubDate>
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