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Wind |
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Black no sugar 
Really should get out more 
Joined: 04 Dec 04 Location: Somewhere between Brighton and Lancing Online Status: Offline Posts: 3941 |
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 Topic: WindPosted: 12 Jun 06 at 4:07pm |
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(she says after flunking a tack yesterday and ending in the drink...) |
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gonzo
Far too distracted from work 
Joined: 30 Oct 05 Location: United Arab Emirates Online Status: Offline Posts: 236 |
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Posted: 12 Jun 06 at 4:16pm |
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we did it on a gybe a few weeks back. about 18 to 20 knots ready to gybe chris yep ok nice and easy go me face down on the mast chris landing on my back all in the space of 2 seconds from our last words what happened |
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Go Big or Go home or sail a 49er!!!
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mike ellis
Really should get out more
Joined: 30 Dec 05 Location: United Kingdom Online Status: Offline Posts: 2339 |
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Posted: 12 Jun 06 at 9:35pm |
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im going to be technical here because im just about sure i understand this: the speed of the wind measured by an anemometre with paddles or windmill type things will always be constant, no matter the pressure. all that matters is the difference between the friction on the front of the blade to the friction on the back. if there are more particles hitting the front and speeding it up, there must be more particles hitting the back and slowing it down. therefore the speed measured will be constant. |
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600 732, will call it Sticks and Stones when i get round to it.
Also International 14, 1318 |
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Iain C
Really should get out more
Joined: 16 Mar 04 Location: United Kingdom Online Status: Offline Posts: 1113 |
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Posted: 12 Jun 06 at 11:03pm |
It's called "density altitude". Your aircraft performes as if it was already at altitude rather than being sat on the ground. In fact you get a double whammy as not only do your wings produce as much lift for any given airspeed, your engine also produces less power and the propeller is less effective. |
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RS700 GBR922 "Wirespeed"
Fireball GBR14474 "Eleven Parsecs" Enterprise GBR21970 Bavaria 32 GBR4755L "Adastra" |
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Ian99
Posting king 
Joined: 07 Apr 05 Online Status: Offline Posts: 138 |
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Posted: 12 Jun 06 at 11:40pm |
Given that humans have the same problem with less air at higher altitude meaning everything is harder work, this means that all things considered, when you sail at Silvaplana, the 25 knots is just as tiring as 25 knots of wind in Britain, just the boat goes slower!!  ..... although as the water is colder you might get more lift off the centreboard to counteract for this(or doesn't it work that way round?) |
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Skiffman
Far too distracted from work
Joined: 27 May 04 Location: United Kingdom Online Status: Offline Posts: 291 |
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Posted: 13 Jun 06 at 9:28am |
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After having sailed in silvaplana for 2 weeks we definatly noticed that the wind speed did not relate to what we were use to back in Britain. To give you an idea the anemometer was reading 25knots average but when we were sailing it felt about 18-20 knots whilst sailing. Thats why the british are good in heavy winds compared to the rest of the world and generally not as fast in the lighter stuff... lol |
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Medway Maniac
Really should get out more
Joined: 13 May 05 Location: United Kingdom Online Status: Offline Posts: 2788 |
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Posted: 13 Jun 06 at 10:02am |
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But that does confirm that a decent anemometer reads the windspeed OK everywhere, even if the effect isn't the one we're accustomed to.
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gonzo
Far too distracted from work
Joined: 30 Oct 05 Location: United Arab Emirates Online Status: Offline Posts: 236 |
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Posted: 13 Jun 06 at 5:08pm |
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so if you can sail in strong winds in britian you can sail anywhere unless your in the antarctic where its really coldand dense but the you would be stupidly cold
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Go Big or Go home or sail a 49er!!!
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mike ellis
Really should get out more
Joined: 30 Dec 05 Location: United Kingdom Online Status: Offline Posts: 2339 |
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Posted: 13 Jun 06 at 8:09pm |
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but in the antartic its so cold the moisture freezes out of the air wich might make it less dense.
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600 732, will call it Sticks and Stones when i get round to it.
Also International 14, 1318 |
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gonzo
Far too distracted from work
Joined: 30 Oct 05 Location: United Arab Emirates Online Status: Offline Posts: 236 |
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Posted: 14 Jun 06 at 3:43am |
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but the air is still cold so will sink down and therefore be denser dosent matter about moisture level moisture only con tributes to level of humidity
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Go Big or Go home or sail a 49er!!!
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