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Roy Race View Drop Down
Far too distracted from work
Far too distracted from work
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Joined: 15 Aug 07
Location: United Kingdom
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Posts: 275 		Post Options Post Options   Quote Roy Race Quote  Post ReplyReply Direct Link To This Post Topic: Tiger Trophy
    Posted: 07 Feb 11 at 4:48pm
Originally posted by marksey

Originally posted by Jamie600

 
"It could have been the dense cold breeze that you tend to get in the winter, which can make the breeze feel stronger"
 
 
Lol i love how ppl role this one out, i guess if you go to the north pole the air is like treacle? nothing to do with air density all to do with wind shear, i think if i heard the RO say that i would have been concerned  


Not quite like treacle, but more dense, yes.

What's not to understand? One cubic Metre of air at 30degreesC has a mass of 1.17kg, a cubic metre of air at 0degreesC has a mass of 1.29Kg. That's a 10% difference.

For the same speed, a cubic metre of 0degreesC air flowing over your sails will impart more energy than a cubic metre of 30degreesC air flowing over your sails, because it is heavier. There's simply more stuff going round your sails.




Edited by Roy Race - 07 Feb 11 at 4:57pm
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asterix View Drop Down
Really should get out more
Really should get out more


Joined: 01 Aug 09
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Posts: 621 		Post Options Post Options   Quote asterix Quote  Post ReplyReply Direct Link To This Post Posted: 07 Feb 11 at 5:12pm
but if air was as 'thick' as treacle would we really sail faster?

Edited by asterix - 07 Feb 11 at 5:12pm
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AlexM View Drop Down
Really should get out more
Really should get out more


Joined: 10 Jan 06
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Posts: 857 		Post Options Post Options   Quote AlexM Quote  Post ReplyReply Direct Link To This Post Posted: 07 Feb 11 at 5:15pm
Anyone know if Rutland are going to publish the times or if anyone can get hold of them?
Alex
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William H Frump View Drop Down
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Joined: 02 Sep 09
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Posts: 92 		Post Options Post Options   Quote William H Frump Quote  Post ReplyReply Direct Link To This Post Posted: 07 Feb 11 at 7:38pm
Originally posted by Roy Race

Originally posted by marksey

Originally posted by Jamie600

 
"It could have been the dense cold breeze that you tend to get in the winter, which can make the breeze feel stronger"
 
 
Lol i love how ppl role this one out, i guess if you go to the north pole the air is like treacle? nothing to do with air density all to do with wind shear, i think if i heard the RO say that i would have been concerned  


Not quite like treacle, but more dense, yes.

What's not to understand? One cubic Metre of air at 30degreesC has a mass of 1.17kg, a cubic metre of air at 0degreesC has a mass of 1.29Kg. That's a 10% difference.

For the same speed, a cubic metre of 0degreesC air flowing over your sails will impart more energy than a cubic metre of 30degreesC air flowing over your sails, because it is heavier. There's simply more stuff going round your sails.


 
Isn't that where you get the term "blowing 110%", makes perfect sense to me
blah blah blah
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