Investment casted strut drive & folding 3-blade aluminium-bronze propeller with shark-skin surface profile

熔模铸造支柱驱动装置

• 批准号: 103633
• 金额: $ 23.07万
• 依托单位: SUPERPROP LTD
• 依托单位国家: 英国
• 项目类别: Collaborative R&D
• 财政年份: 2017
• 资助国家: 英国
• 起止时间: 2017 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=103633
• 关键词: Investment; casted; strut; drive; folding

There is now a greater than 70% move from using the conventional horizontal shaft driven systems on motorised sailing boats to using the more modern vertical strut-drive systems. This move is driven by the market need for a low “sticker price” for competitive selling. However, strut-drive systems suffer from corrosion if the aluminum alloy of the vertical strut becomes, in any way, unprotected by its paint layers such that it comes into contact with seawater. This is especially true if a propeller of aluminium bronze is fitted prompting a galvanic reaction through the sea water. Copper-based anti-foulant paint is currently used but is damaging to the environment. Also, the strut gearing system is prone to failure as a result of torsional stress oscillations that are set up due to the firing impulses of the engine and the cyclical variations in power requirements of the propeller blades. This issue is not alluded to on purchase from a manufacturer who is only interested in repeat consumable item sales. From experience and through discussions with boat owners it appears boat owners can spend up to around £3,800 every 2 years replacing and installing a new strut and propeller due to electrochemical corrosion. Superprop Limited (SPL) propose developing a precision cast vertical strut unit with sacrificial anode and a cast propeller with a surface profile to reduce marine fouling. The combined unit will have a service in life of up to 15 years with substantial saving for boat owners from reduced drag, enhanced performance and reduced fuel use.

现在，超过 70% 的机动帆船从使用传统的水平轴驱动系统转向使用更现代的垂直支柱驱动系统，这是由市场对低“标价”的竞争性销售的需求推动的。然而，如果垂直支柱的铝合金以任何方式不受其油漆层的保护而与海水接触，则支柱驱动系统会遭受腐蚀，如果安装了铝青铜螺旋桨，则尤其如此。目前使用的是铜基防污涂料，但对环境有害，而且，由于燃烧而产生的扭转应力振荡，支柱传动系统很容易发生故障。发动机的脉冲和螺旋桨叶片的功率需求的周期性变化在从只对重复消耗品销售感兴趣的制造商那里购买时没有提到这个问题。由于电化学腐蚀，船主每两年可能要花费约 3,800 英镑更换和安装新的支柱和螺旋桨，Superprop Limited (SPL) 建议开发一种带有牺牲阳极的精密铸造垂直支柱装置和带有表面的铸造螺旋桨。该装置的使用寿命长达 15 年，通过减少阻力、增强性能和减少燃料使用，为船主节省大量成本。