Sail downwind faster than the wind!
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From: John Doe on 7 Aug 2010 19:53 "Cwatters" <colin.wattersNOSPAM TurnersOakNOSPAM.plus.com> wrote: > "John Doe" <jdoe(a)usenetlove.invalid> wrote in message >> A simple explanation would do. The idea that a propeller spins >> in the wind and that power can be transferred to wheels is >> easy. > > That's correct when going upwind but wrong for the DDWFTTW case. > > Going downwind it's actually the other way around. The wheels > power the prop. In effect the cart is "squeezed" between the > ground and the wind. > > That will sound like nonsense but I promise you that's the > correct explanation. Don't take my word for it, go read the > explanation provided by the people that designed it. As it turns out, it was invented sometime back. The guy running around the Internet acting like he invented it claims to have come up with the idea independently, but there is no way to know whether that is true. --
From: John Doe on 7 Aug 2010 19:59 "Cwatters" <colin.wattersNOSPAM(a)TurnersOakNOSPAM.plus.com> wrote: > "John Doe" <jdoe(a)usenetlove.invalid> wrote >> [Talking about sailing directly into the wind, using one air >> and one water propeller connected directly to each other.] > Since it's been public domain since 1950 or 60 I doubt it can be > patented. > > I believe there is a British patent for a boat version but can't > be bothered to look it up. There are some ultra-simple experiments shown on YouTube. I gave up the counter argument because it would be too easy to prove. .... a piece of styrofoam .... a rod .... two propellers, stuck onto the rod ends .... two sticks with some sort of bearings, stuck into the styrofoam, to hold the rod .... a trough of water .... a fan
From: John Doe on 7 Aug 2010 20:08 "Cwatters" <colin.wattersNOSPAM(a)TurnersOakNOSPAM.plus.com> wrote: .... Have you seen powered paragliding?
From: John Doe on 8 Aug 2010 16:22 jimp(a)specsol.spam.sux.com wrote: > John Doe <jdoe(a)usenetlove.invalid> wrote: >> jimp specsol.spam.sux.com wrote: .... >>> Only that it is obvious you have no clue about airfoils, how >>> they work, or their history. >> >> Says someone claiming that a sail boat sail works the same as >> an aircraft wing. >> >> But seriously... > > Seriously, there are many, many kinds of sailboat sails, a fact > you seem to have totally missed. Go ahead and provide a citation to a sailboat sail that works the same as an aircraft wing, please.
From: jimp on 8 Aug 2010 16:44
John Doe <jdoe(a)usenetlove.invalid> wrote: > jimp(a)specsol.spam.sux.com wrote: > >> John Doe <jdoe(a)usenetlove.invalid> wrote: >>> jimp specsol.spam.sux.com wrote: > > ... > >>>> Only that it is obvious you have no clue about airfoils, how >>>> they work, or their history. >>> >>> Says someone claiming that a sail boat sail works the same as >>> an aircraft wing. >>> >>> But seriously... >> >> Seriously, there are many, many kinds of sailboat sails, a fact >> you seem to have totally missed. > > Go ahead and provide a citation to a sailboat sail that works the same > as an aircraft wing, please. Sure, there are lot's of them. http://en.wikipedia.org/wiki/Wingsail http://www.omerwingsail.com/ http://www.wingsails.com/ http://www.solarnavigator.net/wing_sails.htm http://sailing.about.com/b/2009/11/12/americas-cup-bmw-oracle-goes-with-fixed-wing-sail.htm Those should give you a start on eliminating your ignorace. -- Jim Pennino Remove .spam.sux to reply. |