Wind Engine

By Keith Henderson at August 22, 2010 10:09
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In an earlier blog Reducing Air Drag, I mentioned the organization Greenwave. They have another wind power project called the Wind Engine.It is a mechanical sail uses the Magnus Effect and in its practical ship application has a tall cylindrical rotor as pioneered by Flettner in 1926. Test carried out by Auckland University, New Zealand, determined that the thrust produced by the Flettner rotor is eight to ten times more than a sail of equal area. Further tests with a 25:1 model ship indicate that wind assisted propulsion can deliver significant fuel and emission reductions with favorable winds and provides good maneuverability including crash stop performance. Lloyd’s Register provided technical assistance and expertise, for the construction of a full sized prototype rotor that was erected on a site in NE England. The next stage of the project is on board ship tests at sea which will be independently monitored by Lloyd's Register and is scheduled to take place during 2010.





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Propeller shaft enclosure system

By Keith Henderson at July 09, 2010 16:34
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There is a patented device claiming to give between 6 to 10 per cent increased efficiency to the propulsion system applying mainly to planning hulls with inboards. The BOSS (Bolt On Shaft System) as it is called, basically is a tube that encloses the immersed part of the propeller shaft and combines it with a seal and thrust bearing that is mounted directly on to the hull. The self contained unit eliminates through hull sealing and alignment difficulties, and allows the gearbox and engine to be mounted free of thrust considerations. The propeller end of the tube is supported by a P-bracket type of arrangement. For the boat builder, installation times are substantially reduced and the built-in watertight shaft seal ensures a dry bilge. For the user, the reduced losses give the benefits of lower fuel consumption, improved range or a higher top speed. It’s available for shaft diameters of one to four inches (25 – 102mm) and is claimed to lower propulsion noise and vibration.
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