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John Miele

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Top Stories by John Miele

France Helices designs its’ drive systems starting with the propeller, and moving forward. Why? One of the primary impediments to propeller efficiency is cavitation. Additionally, cavitation not inly impacts propeller efficiency, but in extreme cases, it can seriously damage a propeller. There is a fairly thorough discussion about cavitation and its’ effects on our Wiki, located HERE. In order to accurately see the impact of propeller design changes on cavitation, one must use a cavitation tunnel. This is a step that many inexpensive propeller manufacturers do not perform, due to the expense associated with tunnels. However, it is our belief that in order for any propeller to truly achieve performance, one must use such facilities. In particular, this is important for surface piercing propellers that operate with a substantial amount of exposure to air. All Franc... (more)

EU press release about reducing ship emissions

The EU released a statement regarding the future of emissions reduction efforts within its’ borders: Reducing emissions from shipping: Commission’s Joint Research Centre sets out some options Maritime transport causes about 4% of global man-made CO2 emissions which makes its carbon footprint approximately as high as Germany’s. There is no regulation of international maritime transport emissions yet, but this is currently under discussion in the International Maritime Organization (IMO) and at the United Nations Framework Convention on Climate Change (UNFCCC). In respect of gree... (more)

Japan competing with Korea in low-polluting engines

From Hellenic Shipping News: Its aim is to establish technology that recirculates exhaust gases and create a system that reduces nitrogen oxide emissions using catalysts. If the denitrification equipment works as intended, it is expected to cut nitrogen oxide emissions by 80 per cent compared to conventional engines. Through these efforts, the companies hope to maintain a technological lead over South Korean rivals. For the complete article text, click HERE: http://www.hellenicshippingnews.com/index.php?option=com_content&task=view&id=126951&Itemid=79 Earlier this year, we wrot... (more)

How large is STI’s scrubber? Here’s the steps we take.

A frequent question we are asked, and of great concern to STI’s customers, is “How much space does your scrubber require?” Unfortunately, there is no simple quick and dirty answer to this question. Any manufacturer who says that a mere table showing horsepower to size is being misleading. Unit size is based on a multitude of factors: Size and number of engines, operating characteristics, horsepower, and type of engine. Whether the vessel is newbuild or retrofit greatly impacts the location and size. Even fuel type has an impact. STI typically will quote an initial price, modifie... (more)

Bottom Line Impact of Cap and Trade

Right before MEPC 61, there was quite a bit of press regarding the potential establishment of Cap and Trade in the shipping industry. If Cap and Trade were to be established, what would be the potential bottom line impact of such a scheme on ship owners’ daily operations? Carbon Positive publishes an interesting web site, previously mentioned several times here on Clean Air at Sea, http://www.carbonpositive.net/ . Take a look at their home page, and scroll down a bit. On the bottom right, they have prices listed for carbon credits as applicable to industry in several markets wh... (more)