Sail downwind faster than the wind!
in [Physics]
|
Prev: Here is an example how STOOOPID SKEPTOS are!
Next: The participants in these newsgroups are arithmetic morons
From: John Doe on 30 Jul 2010 05:40 It is discussed on the website (http://www.physicsforums.com) recently as this year. I see some problems with the idea as argued. They keep talking about wind speed with respect to ground speed as if that is a power generator. They also seem to be pretending that gearing, or the difference between wheel and propeller rotation speeds, is somehow a power source. The follow-on argument appears to be that you can sail directly into the wind. I see no prior discussion here on UseNet. On the Internet, I see it is discussed as early as 2007. Apparently the idea was originated by Jack Goodman in 2006.
From: Cwatters on 30 Jul 2010 06:11 "John Doe" <jdoe(a)usenetlove.invalid> wrote in message news:4c529e1b$0$21228$c3e8da3(a)news.astraweb.com... > It is discussed on the website (http://www.physicsforums.com) > recently as this year. > > I see some problems with the idea as argued. They keep talking > about wind speed with respect to ground speed as if that is a > power generator. They also seem to be pretending that gearing, or > the difference between wheel and propeller rotation speeds, is > somehow a power source. That's exactly how it works. The maths proof of how it works and a solution for the conditions under which it works is also out there on the web. A land based version was recently built and tested. It achieved more than twice the wind speed. See Youtube. I believe the first working machine to do it was built in the 1960's. > The follow-on argument appears to be that you can sail directly > into the wind. Also possible and has been demonstrated many times, including on full size boats. > I see no prior discussion here on UseNet. On the Internet, I see > it is discussed as early as 2007. Apparently the idea was > originated by Jack Goodman in 2006. This has been discussed a million times on different forums. . Aside: America Cup yachts manage to sail between two points (one directly downwind of the other) faster than the wind by "tacking" downwind. If they can do it the rest is just engineering.
From: John Doe on 30 Jul 2010 06:50 "Cwatters" <colin.wattersNOSPAM TurnersOakNOSPAM.plus.com> wrote: > "John Doe" <jdoe usenetlove.invalid> wrote >> It is discussed on the website (http://www.physicsforums.com) >> recently as this year. >> >> I see some problems with the idea as argued. They keep talking >> about wind speed with respect to ground speed as if that is a >> power generator. They also seem to be pretending that gearing, >> or the difference between wheel and propeller rotation speeds, >> is somehow a power source. > > That's exactly how it works. The maths proof of how it works and > a solution for the conditions under which it works is also out > there on the web. A land based version was recently built and > tested. It achieved more than twice the wind speed. See Youtube. > I believe the first working machine to do it was built in the > 1960's. > >> The follow-on argument appears to be that you can sail directly >> into the wind. > > Also possible and has been demonstrated many times, including on > full size boats. > >> I see no prior discussion here on UseNet. On the Internet, I >> see it is discussed as early as 2007. Apparently the idea was >> originated by Jack Goodman in 2006. > > This has been discussed a million times on different forums. . > > Aside: America Cup yachts manage to sail between two points (one > directly downwind of the other) faster than the wind by > "tacking" downwind. When you are tacking, the wind does not stop blowing against your sails. I believe it is all part of some joke warfare... -- > If they > can do it the rest is just engineering. > > > > > > > > Path: news.astraweb.com!border2.newsrouter.astraweb.com!border2.nntp.dca.giganews.com!border1.nntp.dca.giganews.com!nntp.giganews.com!local2.nntp.dca.giganews.com!nntp.brightview.co.uk!news.brightview.co.uk.POSTED!not-for-mail > NNTP-Posting-Date: Fri, 30 Jul 2010 05:11:30 -0500 > From: "Cwatters" <colin.wattersNOSPAM TurnersOakNOSPAM.plus.com> > Newsgroups: sci.physics > References: <4c529e1b$0$21228$c3e8da3 news.astraweb.com> > Subject: Re: Sail downwind faster than the wind! > Date: Fri, 30 Jul 2010 11:11:31 +0100 > X-Priority: 3 > X-MSMail-Priority: Normal > X-Newsreader: Microsoft Outlook Express 6.00.2900.5931 > X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5931 > X-RFC2646: Format=Flowed; Original > Message-ID: <QbSdnX9E88HPOM_RnZ2dnUVZ8tGdnZ2d brightview.co.uk> > Lines: 38 > X-Usenet-Provider: http://www.giganews.com > X-Trace: sv3-j8n8mi6cDzvSxHHfLL5kMtqRASQ/4SFTwqEuW+6G5sCCas80TK0UGepZCvkvoxVErRqIpVWS/S4XEV5!Qa5jNOv7xz1Rf6XS5Bp2/RkDQumhxfHX9VGNnUBCw+kKmJeaCr3g7HUozid82HVQUlj5EuO9RFk6!U/U4hcDOHEbZoWAiWzMub+Y1D+8= > X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers > X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly > X-Postfilter: 1.3.40 > Bytes: 2646 > X-Original-Bytes: 2582 > >
From: Cwatters on 30 Jul 2010 06:52 http://www.wired.com/autopia/2010/07/its-settled-downwind-faster-than-the-wind-officially-possible/ http://www.youtube.com/watch?v=7SYvg40NHtc http://www.youtube.com/watch?v=EEuAqq8FINw&feature=related http://www.youtube.com/watch?v=PCu9wHvamtI
From: John Doe on 30 Jul 2010 07:30
"Cwatters" <colin.wattersNOSPAM(a)TurnersOakNOSPAM.plus.com> wrote: > http://www.wired.com/autopia/2010/07/its-settled-downwind-faster-than-the-wind-officially-possible/ Lots of things are possible on moderated websites/forums, just depends on the editor. I am sure there is hype about perpetual motion machines too. > http://www.youtube.com/watch?v=7SYvg40NHtc > > http://www.youtube.com/watch?v=EEuAqq8FINw > > http://www.youtube.com/watch?v=PCu9wHvamtI YouTube is a valuable resource for me, especially lately while trying to figure out the best way to build powered inline skates. But YouTube video is hardly scientific. There are lots of wild ideas on the Internet, some of them are advertised to be the best thing since baked bread, and many of those fall flat on their face. The idea has been on the Internet since at least 2006. Let me know when there is a commercial product that sells, or at least some valid United States patents. |