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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>ANOTHER REMARKABLE ACHIEVEMENT BY WETDOCKING</title>
      <link>https://trid.trb.org/View/52309</link>
      <description><![CDATA[The Terrin Company's "Wetdocking" department, which specialises in underwater repairs, recently carried out the removal, repair, and defitting of the 100 ton rudder of 230,000-dwt tanker Blois while she was afloat at Marseilles. The ship had sustained rudder damage while sailing to Fos, and divers had found that the bushing of the lower gudgeon was missing and that the lower pintle was damaged.  No dry-dock was immediately available.  At Marseilles, divers first removed the lower pintle and arranged for the weight of the rudder blade to be taken by a floating crane.  At the same time, other teams dismantled the upper part of the rudder, including the upper pintle, the coupling of the blade and shaft, etc.  The rudder assembly was then removed for workshop repair, after which it was refitted with the ship still afloat.  The article gives further details of this work, which included, for the removal of the 2,290 kg pintle, the welding of four tie-rods to the stern-frame skeg and securing a bedplate to the bottom ends of the rods to serve as a base for a hydraulic jack of 650 tons lifting capacity.  Among the equipment used were underwater TV cameras, the pictures being received in a control-van (with telephone links to the divers) from which the operations was centrally controlled.  Before the Blois left Marseilles, dry-dock accommodation became available for the routine treatment of her hull.  This dry-docking allowed the screw of the lower pintle to be tightened and enabled the underwater work on the rudder to be checked.]]></description>
      <pubDate>Wed, 11 May 1977 00:00:00 GMT</pubDate>
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      <title>NEW STERNTUBE BEARING FOR SHIPS WITH CONTROLLABLE PITCH PROPELLERS</title>
      <link>https://trid.trb.org/View/12024</link>
      <description><![CDATA[A new type of split sterntube has been designed for vessels equipped with controllable-pitch propellers in order to reduce the length of time now necessary to inspect the tailshaft and stern bearing, by making it unnecessary to remove the rudder in order to carry out the inspections. A description of the sterntube and the procedure necessary to carry out the required inspections is presented, along with a sketch showing the jacking arrangement for pressing the sterntube bearing in and out and locking it into place.]]></description>
      <pubDate>Mon, 19 Mar 1973 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/12024</guid>
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      <title>NEW SYSTEM SPEEDS REMOVAL OF TAILSHAFTS</title>
      <link>https://trid.trb.org/View/2605</link>
      <description><![CDATA[Direct labor requirements for removal and replacement of shafts, propellers and rudders on U.S. Navy ships at the Long Beach, Calif., Naval Shipyard have been reduced some 80 percent by the use of a new rigging technique.  The Elpar Mobile Precision System, operated in the drydock, consists of two high-platform trucks, and a pallet which is symmetrically constructed and allows truck platform entry from any of four sides.  The pallet's 120 in. square horizontal surface is divided into identical halves.  Each section has a movable plane that occupies 1/8 of the total horizontal surface.  Each section and plane may be controlled individually or in unison.  Control is left-right and/or forward-reverse.  Two telescoping uprights attached to each section lift the pallet.  A hydraulic cylinder inside the upright provides vertical movements to the mounting plate, on which interchangeable component-carrying arms are attached.  Details are given for the trucks, and the procedures used in removing propellers, shafts and rudders are described.]]></description>
      <pubDate>Fri, 29 Oct 1971 00:00:00 GMT</pubDate>
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