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Revelation II: Windmill powered boat - Open Knowledge — LiveJournal

Apr. 7th, 2008

04:47 am - Revelation II: Windmill powered boat

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Via Treehugger

“The 36 foot catamaran, Revelation II, is powered by 3 20-foot long carbon fiber propellers on a 30 foot rotating mast. The windmill transmits power to a 6 blade propeller underwater, with the net result that the boat can make way even directly into the wind.”

The boat was apparently built by Jim Wilkinson who is a member of the AYRS or Amateur Yacht Research Society.

Original: craschworks - comments

Comments:

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From:reichart
Date:April 9th, 2008 09:16 am (UTC)
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Very cool.
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From:(Anonymous)
Date:June 24th, 2008 07:21 pm (UTC)

Revelation II: Windmill powered boat

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Sorry guys this is not possible. I am a long time sailer and all you have to do is look at this arrangement and you can see that the first puff of wind and this boat will topple like a house of cards. There are however many solar electric boats on the water that work very well.
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From:(Anonymous)
Date:June 17th, 2009 05:51 pm (UTC)

Re: Revelation II: Windmill powered boat

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Im sorry, you are incorrect.

I know the owner of this boat and many times have been out on this exact boat, it is a excelent design and works very well.

Dan
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From:(Anonymous)
Date:July 11th, 2009 01:50 pm (UTC)

Re: Revelation II: Windmill powered boat

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I've posted the following already on a couple of blogs since your disbelief seems to be common enough.

The windmill powered boat going against the wind does not violate the conservation of energy law. I believe the confusion relating to this topic is the fact that people are confusing over all energy with net force. Consider the equation E=F x d, where E = energy d = distance and F is force. Now consider the fact that the boat is actually travelling in two media (Air and Water) with(on a windy day) differing relative velocities to each. Now while the underwater propeller must create a greater force then the opposing force on the wind turbine a greater energy may still be imparted from the flowing air to the wind turbine than is imparted from the propeller to the water as the distance travelled by the turbine through the air medium is much greater(relativistically speaking) then the distance travelled by the propeller through the water. It is down to the fact that momentum and kinetic energy are two different things. For instance a larger mass of propelled water my have greater momentum and hence provide a greater reaction to the boat but have a lower kinetic energy than a lesser mass of faster moving air.
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