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到1972年中期,已有十一条二万二千~二万四千吨级的散装货船按装了拉斯顿·霍恩斯比(Ru-ston & Hornsby)公司的AO型中速柴油机,每一条船均由双机并车驱动.但从1973年5月起到1974年8月,这些柴油机均被斯托克·维克斯普(Stork-Werkspor)公司的TM410型中速机所替换,本文叙述了必须进行这种替换的原因.文章论述了用TM410型机替换AO型机的过程,介绍了为此而成立的执行机构.到1974年7月31日,6条改装TM410型中速机船航行的小时数已相当可观,文中用表格列出了它们的性能.对M.V.Cape Grenville号船上早期出现的9次排气阀故障作了调查,其产生原因及消除的方法等亦作了详细介绍.对改装了主机的船的性能作了新的估价,并与1968年决定用中速柴油机驱动散装货船时所预期的优点进行了比较.文章还介绍了1974年进行的一次设计研究的结果和研究中使用的低速机和中速机的实船工作数据.这些发动机都是在一家公司经营的同类型船只上工作的.结果表明:对于二万六千吨级左右的散装货船说来,最有吸引力的动力装置是两台中速机通过齿轮箱驱动一根螺旋桨轴.
By mid-1972, eleven twenty-two to twenty-four thousand-ton bulk carriers had been fitted with AO-mode medium-speed diesel engines from Ru-ston & Hornsby, Each boat was driven by a twin-engine combined car, but these diesel engines were replaced by Stork-Werkspor TM410 mid-speed machines from May 1973 to August 1974 , This article describes the reasons why this replacement must be done.The article discusses the process of replacing the AO machine with the TM410 machine and introduces the executive body established for this purpose By July 31, 1974, six of the modified TM410 The number of hours sailing for a speedboat has been considerable, and their performance is tabulated in the text. The investigation of the nine previous venting valve failures on the MVCape Grenville was also conducted, and its causes and solutions The article details new estimates of the performance of modified ships and compares them with the expected benefits of a medium-speed diesel-powered bulk carrier in 1968. The article also presents a design study conducted in 1974 The results and studies used in the low-speed and medium-speed machines for real-life work data The engines are operated on the same type of vessels operated by a company and found that the most attractive power plant for a bulk carrier of about 26,000 tons is that two medium speed machines are driven by a gearbox Root propeller shaft.