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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>HOVERCRAFT FROM A SHIPBUILDER</title>
      <link>https://trid.trb.org/View/45832</link>
      <description><![CDATA[The VT1 introduced several new features on what is even now a fairly large craft, about 100 ft overall length and 90 tons displacement.  The cushion system, including the air feed and stability devices, were new and were developed using ship tank models; the skirt followed closely the system developed by Hovercraft Development Ltd (HDL) and successfully demonstrated on craft fitted with air propulsion; the VT1, however, used a modern but conventional marine propulsion system.  Skegs to carry the propeller shafts were introduced as a new feature to give the craft a semi-amphibious capability while retaining the marine screw, the combination giving as low airborne noise level, good directional stability and high thrust at low speeds.]]></description>
      <pubDate>Thu, 13 Jul 1978 00:00:00 GMT</pubDate>
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      <title>CROSS CHANNEL VIABILITY OF SRN4 OWES MUCH TO BR'S IN SERVICE DEVELOPMENT</title>
      <link>https://trid.trb.org/View/37224</link>
      <description><![CDATA[Pioneered by Seaspeed, a British Rail subsidiary, in 1968, the first SRN 4 hovercraft produced by British Hovercraft Corporation (BHC) was soon afterwards also operated by Hoverlloyd.  The two companies now carry 30% of short route cross-channel car and passenger traffic.  Cancellation of the channel tunnel will inevitably throw an increasing burden onto existing cross-channel services.  Most of this will be passengers and cars, the very traffic that hovercraft services have proved best able to handle and this is expected to double by 1990.  This article briefly reviews some of the major problems encountered and solutions found to reduce down the time due to engineering problems from 28.6% in 1968 to 1.98% in 1974.  Areas covered are skirts, propellers, main engines, systems and controls, transmissions, fuel supply and the main hull structure.]]></description>
      <pubDate>Fri, 21 Apr 1978 00:00:00 GMT</pubDate>
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      <title>DUCTED PROPELLER INSTALLATION FOR THE SRN6 HOVERCRAFT</title>
      <link>https://trid.trb.org/View/45831</link>
      <description><![CDATA[The cylindrical drum structure of the duct was designed in light alloy and the bell-mouth entry and downstream diffuser sections were molded from fiberglass.  The problems of making such sections accurately were considerable, and hardwood plugs representing a third of the circumference were first made as the formers for the heavy fiberglass molds.  To minimize dangers arising from propeller blade tip contact with the duct, the whole of the inner section of the structural box is covered with a layer of polyurethane foam faired into the leading and trailing edge moldings.  The main purpose of this ducted propeller project is to secure a substantial reduction in noise.]]></description>
      <pubDate>Tue, 13 Jul 1976 00:00:00 GMT</pubDate>
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      <title>RESEARCH AND DEVELOPMENT WORK ASSOCIATED WITH LIFT AND PROPULSION OF ACVS</title>
      <link>https://trid.trb.org/View/45837</link>
      <description><![CDATA[Dowty Rotol have been involved with research work and the development of new concepts associated with lift and propulsion devices for ACVs for the last fifteen years. Not all this work has come to fruition, but the basic concepts are still of interest, and such concepts are dealt with, along with those ideas that have proceeded to the stage of entering civil or military service.  The concepts that are covered in the paper are: plastic centrifugal lift fans, variable pitch centrifugal fans, cross-flow or tangential flow fans, high speed centrifugal fans for hovertrain, blade erosion protection methods, quiet propellers, ducted propulsion fans, plastic blades, multistage axial flow water jet units, and new aerofoil sections.]]></description>
      <pubDate>Tue, 13 Jul 1976 00:00:00 GMT</pubDate>
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      <title>HOVERCRAFT PROPELLERS</title>
      <link>https://trid.trb.org/View/19932</link>
      <description><![CDATA[This paper deals with hovercraft propellers intended for civil or military craft which have to meet stringent requirements, akin to airworthiness regulations on civil aircraft.  Early problems in designing these propellers, such as estimating the airflow into the propeller disc, are discussed.  Characteristics of propeller hub design, propeller resonances, and aerodynamics of propeller blades, among others, are all considered.  The problem of corrosion is also discussed, as is propeller noise, with the possible solution to the noise problem lying in the utilization of reinforced plastic blades.]]></description>
      <pubDate>Fri, 16 Aug 1974 00:00:00 GMT</pubDate>
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