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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>ACTUAL TAIL SHAFT BEHAVIOR ON OIL FILM TAKING ACCOUNT OF PROPELLER FORCES AND MOMENTS</title>
      <link>https://trid.trb.org/View/166176</link>
      <description><![CDATA[Research into stern-tube bearing damage and stern-gear behaviour has shown that it is no longer acceptable to ignore the static and dynamic interactions between the propeller and the tailshaft and its supports.  Deformation of the stern-tube bush material and the bearing support must also be allowed for.  There is a lack of knowledge on how the oil film builds up.  The Authors (of Bureau Veritas) discuss theoretical studies on this oil-film build-up, together with the dynamic behaviour of the tailshaft in the stern tube, and take into account (i) distortion or bowing of the tailshaft journal under the influence of the propeller forces and moments and the alignment conditions; (ii) sloped boring-out of the white-metal bush to match the journal to the bearing surface; (iii) influence of the propeller forces and moments which cause skewed mis-alignment between the journal and the stern-tube bush; and (iv) correlation between theoretical calculations and measurements taken on a test-rig and in a VLCC.  Order from BSRA as No. 54,767.]]></description>
      <pubDate>Thu, 21 May 1981 00:00:00 GMT</pubDate>
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      <title>ACTUAL STATE OF DAMAGE CHARACTERISTICS OF MARINE PROPULSIVE SYSTEMS</title>
      <link>https://trid.trb.org/View/167156</link>
      <description><![CDATA[With a view to improving the reliability of marine steam propulsion systems, an investigation of failures occurring in the Nippon Kaiji Kyokai fleet has been carried out.  The damage data were collected during NK regular inspections over a period of three years (1974-1976) from 52 steamships that entered service between 1956 and 1975.  The data have been analysed and attention paid to the variation in rate of damage occurrence in relation to time in service.  The type of trouble encountered with steam-turbine propulsion systems is shown clearly by the results, and is tied to the accumulation of stresses with time (e.g. corrosion, wear, etc.).  The frequency of damage to boiler systems increases rapidly after six or seven years of service, due mainly to waterside corrosion of the superheater and other boiler tubes.  Turbine damage is mainly to components and reduction gears when entering service at first, but later, after three or four years trouble mostly arises with the condensation system.  The most noticeable problem with the propulsion system is wearing out of the sterntube oil-seal equipment and cracking of the shaft cone big end, incidents which occur mostly on first coming in to service.  Order from BSRA as No. 54,891.]]></description>
      <pubDate>Thu, 21 May 1981 00:00:00 GMT</pubDate>
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      <title>SUMMARY OF PROPELLER AND TAILSHAFT INTERFACE CONSIDERATIONS</title>
      <link>https://trid.trb.org/View/141867</link>
      <description><![CDATA[Considerations for the design, installation, survey and repair of propellers and tailshafts are discussed. Particular emphasis is placed on stress concentrations and other factors which cause in-service problems.  The recognition of the more common problems, and methods of repair are discussed.  A method for calculating the stress in a typical tailshaft based on the fatigue analysis method is included as an appendix.]]></description>
      <pubDate>Tue, 27 Nov 1979 00:00:00 GMT</pubDate>
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      <title>AN IMPROVED STERN BEARING SYSTEM--DESIGN FEATURES OF AND OPERATIING EXPERIENCE WITH TURNBULL SPLIT STERN BEARINGS</title>
      <link>https://trid.trb.org/View/12121</link>
      <description><![CDATA[Stern bearings have been a neglected area of marine engineering design, having remained virtually unchanged since their introduction.  The dramatic increase in ship size and power in recent years, together with the need to increase the availability of the vessel in service, has led to the production of new designs of stern bearings to overcome the inherent disadvantages of stern tubes.  The split stern bearings described in this paper can be installed more easily and in a much shorter time than that required for a stern tube.  These bearings enable tailshaft surveys to be carried out with considerable savings in both time and labor since the tailshaft with propeller are not removed.  The design allows the bearing and the condition of the tailshaft, bearing, and oil seals to be checked while the vessel is afloat.]]></description>
      <pubDate>Fri, 06 Apr 1973 00:00:00 GMT</pubDate>
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