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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>SURFACE SHIP HYDRODYNAMIC DESIGN PROBLEMS AND R AND D NEEDS</title>
      <link>https://trid.trb.org/View/143570</link>
      <description><![CDATA[The operational effectiveness of conventional surface ships of the U.S. Navy is compromised by many design deficiencies related to the hydrodynamic aspects of surface ship performance. These deficiencies in many cases have resulted in ships which either fail to meet performance requirements, or which are larger and more costly, both to acquire and to operate, than necessary.]]></description>
      <pubDate>Mon, 29 Dec 1980 00:00:00 GMT</pubDate>
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      <title>A COMPARISON OF SEVERAL HYBRID SURFACE SHIP CONCEPTS</title>
      <link>https://trid.trb.org/View/80876</link>
      <description><![CDATA[In this paper several hybrid surface ship concepts are described and their estimated speed-power and range performance compared under calm and rough water conditions. The concepts analysed are the Small Waterplane Area Single Hull (SWASH) Ship, Hydrofoil Small Waterplane Area Ship (HYSWAS), Large Hydrofoil Hybrid Ship (LAHHS), Hydrofoil Air Cushion Ship (HYACS) and Small Waterplane Area Air Cushion Ship (SWAACS).  All concepts investigated are of 2,000-ton (2,032-tonne) displacement having various combinations of buoyancy, foil lift or powered static-lift from an air cushion.  Analysis showed that HYSWAS and LAHHS with about 70% buoyant lift and 30% dynamic lift are expected to have generally favourable characteristics in both calm and rough water over a broad speed spectrum leading to relatively good speed and range performance.  These concepts therefore, appear to be promising configurations for future consideration.  However, for special purpose missions, where for instance only a segment of speed spectrum is dominant or rough water operations are not anticipated, other hybrid forms may show potential and might be pursued further. Order from BSRA as No. 49,257.]]></description>
      <pubDate>Sat, 03 Feb 1979 00:00:00 GMT</pubDate>
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      <title>MODEL TESTS OF AN ARCTIC SEV OVER MODEL ICE</title>
      <link>https://trid.trb.org/View/20670</link>
      <description><![CDATA[The model test program for the Arctic SEV (Surface Effect Vehicles) consisted of two parts. The objective of the first part was to determine the resistance of an SEV operating over ice covered water. The second part of the test program was concerned with the problems associated with parking the Arctic SEV on the ice. Each part consisted of a series of model tests conducted in the ARCTEC Ice Model Basin, Savage, Maryland, to empirically determine the desired relationships between the independent and dependent test variables.]]></description>
      <pubDate>Tue, 12 Nov 1974 00:00:00 GMT</pubDate>
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