Sail downwind faster than the wind!
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From: jimp on 30 Jul 2010 19:49 John Doe <jdoe(a)usenetlove.invalid> wrote: > jimp specsol.spam.sux.com wrote: > >> John Doe wrote: >>> "Androcles" wrote: >>> >>> ... >>> >>>> A sail is an aircraft wing tipped vertically. >>> >>> No it is not. A sail does not have a flat surface opposite the >>> curved surface. >> >> Neither do all airfoils on airplane wings. > > Right. > >>>> The wing is there to fight gravity. The sail produces the same >>>> lift >>> >>> No. Wind on either side is moving at the same speed as the >>> other. The only reason the sail is curved is because it is made >>> of fabric. >> >> There are airplanes flying with fabric wings not much different >> than a sail. > > There is no such thing as a flexible fabric aircraft wing like on > a sail boat. If somehow there were less pressure on the forward > side, a sail would invert. Like if the aircraft were flying backwards perhaps? > The forces that lift an aircraft wing do not exist against a sail > because wind attacks an airplane wing at a different angle than > wind pushes against a sail. A sweeping statement but wrong because there is more than one kind of sail. > But the direction of the proposed lift is not even correct for a > sail on a sailboat. That imaginary lift would push the sailboat > backwards, not forwards. All babble. Before you make any more foolish sweeping statements, I would suggest looking at early aircraft designs, current ultralight aircraft designs, and advanced sail systems such as wind sails. The 60 foot catamaran Stars and Strips used a wind sail in the 1988 America's Cup race, so such things have been around for a while. -- Jim Pennino Remove .spam.sux to reply.
From: jimp on 30 Jul 2010 20:03 jimp(a)specsol.spam.sux.com wrote: > John Doe <jdoe(a)usenetlove.invalid> wrote: >> jimp specsol.spam.sux.com wrote: >> >>> John Doe wrote: >>>> "Androcles" wrote: >>>> >>>> ... >>>> >>>>> A sail is an aircraft wing tipped vertically. >>>> >>>> No it is not. A sail does not have a flat surface opposite the >>>> curved surface. >>> >>> Neither do all airfoils on airplane wings. >> >> Right. >> >>>>> The wing is there to fight gravity. The sail produces the same >>>>> lift >>>> >>>> No. Wind on either side is moving at the same speed as the >>>> other. The only reason the sail is curved is because it is made >>>> of fabric. >>> >>> There are airplanes flying with fabric wings not much different >>> than a sail. >> >> There is no such thing as a flexible fabric aircraft wing like on >> a sail boat. If somehow there were less pressure on the forward >> side, a sail would invert. > > Like if the aircraft were flying backwards perhaps? > >> The forces that lift an aircraft wing do not exist against a sail >> because wind attacks an airplane wing at a different angle than >> wind pushes against a sail. > > A sweeping statement but wrong because there is more than one kind of > sail. > >> But the direction of the proposed lift is not even correct for a >> sail on a sailboat. That imaginary lift would push the sailboat >> backwards, not forwards. > > All babble. > > Before you make any more foolish sweeping statements, I would suggest looking > at early aircraft designs, current ultralight aircraft designs, and advanced > sail systems such as wind sails. > > The 60 foot catamaran Stars and Strips used a wind sail in the 1988 America's > Cup race, so such things have been around for a while. Oops, "wind sail" should be "wing sail". -- Jim Pennino Remove .spam.sux to reply.
From: Benj on 31 Jul 2010 02:29 On Jul 30, 7:40 pm, Sam Wormley <sworml...(a)gmail.com> wrote: > In 2009, the world speed sailing record on water was set by a > hydrofoil catamaran sailing at 1.71 times the speed of the wind. > See:http://en.wikipedia.org/wiki/Sailing_faster_than_the_wind Oh sure, Sam! If it's in Wikipedia it MUST be true! Sure, that's one reliable source you've got there! how about some peer reviewed scientific papers? Aren't any are there? That' s because EVERYBODY knows you can't sail faster than the wind! It's just nonsense. Keep this up and the next thing you know you will be denying that a carbon footprint causes catastrophic Global Warming! Go read a freshman textbook!
From: nuny on 31 Jul 2010 05:46 On Jul 30, 1:49 pm, John Doe <j...(a)usenetlove.invalid> wrote: > "Androcles" wrote: > > > A sail is an aircraft wing tipped vertically. > > No it is not. A sail does not have a flat surface opposite the > curved surface. Wright Flyer. No flat surface opposite the curved wing surface. > > The wing is there to fight gravity. The sail produces the same > > lift > > No. Wind on either side is moving at the same speed as the other. > The only reason the sail is curved is because it is made of > fabric. You might want to take a good look at early flying machines, and consider unlearning some of the comic-book aerodynamics you seem to believe. Mark L. Fergerson
From: Cwatters on 31 Jul 2010 12:50
"John Doe" <jdoe(a)usenetlove.invalid> wrote in message news:4c533ac9$0$30344$c3e8da3(a)news.astraweb.com... > "Androcles" wrote: > > ... > >> A sail is an aircraft wing tipped vertically. > > No it is not. A sail does not have a flat surface opposite the > curved surface. > >> The wing is there to fight gravity. The sail produces the same >> lift > > No. Wind on either side is moving at the same speed as the other. > The only reason the sail is curved is because it is made of > fabric. > -- Bit like a hang glider then. |