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On Sat, 20 Nov 2010 19:20:11 +0000, Justin C
wrote: In article , Bruce wrote: On Fri, 19 Nov 2010 23:34:40 +0000, Justin C wrote: quote The GREEN MOTION system eliminates fossil fuel used by sailing yachts in any way. Electrical energy is generated with the system and is stored in batteries (lithium Iron Phosphate are optional). It will generate sufficient energy to be used for propulsion, hot water, cooking and all electrical equipment and navigation on board. When batteries are fully charged or high speed is required (race) the lifted Motogens eliminate the drag from the propulsion system and this increases the speed of the yacht (between 5 - 15%). Retractable Motogen The electric retractable Motogen is new, light weight, extremely efficient and better than any propulsion system ever designed for yachts. Usable in all sailing yachts from 30 to 90 ft (9-30 m): monohull, catamaran or trimaran). Installation can be made inside the hull in a monohull or on a retractable arm for multihull. 5 years of extensive testing has been done with a ‘proof of concept’ sailing in excess of 10.000 Nm. /quote URL:http://www.green-motion.com/ I suspect that the estimates of drag versus speed for the generator propeller is highly optimistic. The best estimates I can find are that the drag from a 3 bladed prop reduces speed by about 15%, not the 5 - 15% mentioned. They put a small amount of current through the motors as the same time as using them to generate, this partially compensates for the drag - according to last month's Yachting Monthly feature. Justin. Perhaps I'm a cynic but it sounds like pie in the sky. Of course if they put a small amount of current through the device, i.e., power it, it will result in less drag. But of course it also results in less net current generated. Frankly it sounds very much like a perpetual motion machine. Cheers, Bruce |
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