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ellistine View Drop Down
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Posts: 762 		Post Options Post Options   Quote ellistine Quote  Post ReplyReply Direct Link To This Post Topic: Top end limit finally reached..
    Posted: 25 Jun 12 at 2:25pm
Originally posted by Contender443

Originally posted by RS400atC

Originally posted by ellistine

Something I noticed during the last Sail for Gold, the Portland Harbour anemometers were reading nearly 30knots yet the on the water commentators where reporting 16knots on their handhelds. As somebody who basis whether to sail or not on what the wall says, I wouldn't be surprised if I've ever sailed in much more than 20knots.


Windspeed is normally standardised at 10 metre height.
For weather people anyway.
At the sea surface it will be a fraction of that.
What happens at the height of  a dinghy rig will vary according to how turbulent the air is.
So 16 knots at deck level could easily be 30knots at 10 metres.
There are no many dinghies with 10metre rigs. Is there an equation to calculate at mid rig height say about 3m?
 
Mind you most ROs on a committee boat will be measuring the wind strength at about that height. They may also be using a yachts mast head anenometer.
Isn't this something to do with the Boundary Layer (trying desperately to remember what Mr Bathwaites book said)?  The layer of increasing windspeed between sea/ground level (0 knots) to the altitude at where the wind is at it's maximum strength.
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Post Options Post Options   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 25 Jun 12 at 2:30pm
Cambermet. 

Not really a case of forum wind! That's when you randomly make up a figure based upon you're own judgement, then add 5 knots to boast. 

That's clearly not what I have done; I'm just openly quoted what was measured on the day from the only source available. I believe chimet etc. are professionally calibrated too, so I'd say they are as accurate as you'll get, probably more so than any of us guessing.
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I luv Wight View Drop Down
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Posts: 628 		Post Options Post Options   Quote I luv Wight Quote  Post ReplyReply Direct Link To This Post Posted: 25 Jun 12 at 3:02pm
I would say that Bramblemet under-reads compared to winds ( Westerly-ish ) in the gorge between Lepe and Gurnard, there a few knots less at Bramblemet as the wind fans out into the central Solent.


Edited by I luv Wight - 25 Jun 12 at 3:03pm

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Xpletive View Drop Down
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Posts: 320 		Post Options Post Options   Quote Xpletive Quote  Post ReplyReply Direct Link To This Post Posted: 25 Jun 12 at 5:08pm
The phenomenon 'Forum Wind' emanates only from Hythe and blows in all directions at once.
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winging it View Drop Down
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Posts: 3958 		Post Options Post Options   Quote winging it Quote  Post ReplyReply Direct Link To This Post Posted: 25 Jun 12 at 5:27pm
my figures were coming from the PRO out on the course.  30 knots is ok for Challengers, provided they can get all three hulls through the waves for tacking.  The waves were close on a metre by the end of the day, not bad for a lake.
the same, but different...

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sargesail View Drop Down
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Posts: 1459 		Post Options Post Options   Quote sargesail Quote  Post ReplyReply Direct Link To This Post Posted: 25 Jun 12 at 6:22pm
Originally posted by Xpletive

The phenomenon 'Forum Wind' emanates only from Hythe and blows in all directions at once.

Not true - hot air rises.
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Post Options Post Options   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 25 Jun 12 at 11:05pm
It was the Blaze nationals last weekend. The Blaze is a boat that likes a bit of wind, but the Friday and the Sunday were (rightly imo) blown off, so only racing was a windy Saturday.
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getafix View Drop Down
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Posts: 2143 		Post Options Post Options   Quote getafix Quote  Post ReplyReply Direct Link To This Post Posted: 26 Jun 12 at 6:24am
Originally posted by Peaky

The Blaze is a boat that likes a bit of wind  


not sure about 'forum wind' but that definitely counts as a 'forum understatement' in a big way :-)
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G.R.F. View Drop Down
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Posts: 4028 		Post Options Post Options   Quote G.R.F. Quote  Post ReplyReply Direct Link To This Post Posted: 26 Jun 12 at 8:35am
Originally posted by Peaky

It was the Blaze nationals last weekend. The Blaze is a boat that likes a bit of wind, but the Friday and the Sunday were (rightly imo) blown off, so only racing was a windy Saturday.

Yes I'd agree with that, and if I had to be out in that wind, probably a boat , not unlike the Contender that one could 'cope' with, but with emphasis on the word cope, I wouldn't say there would be a lot of serious 'control' going on.....
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Post Options Post Options   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 26 Jun 12 at 9:28am
If even a boat as 'wind worthy' as the Blaze didn't sail 2 days out of 3 at their biggest event of the year, that suggests that it was a pretty darned windy weekend, and it's hard to imagine why anyone would chose to sail in that weather for fun! I never bothered to rig on Sunday, but there were a few ready to go and feigning disappointement when racing was finally abandoned.

The spray in my face on Saturday was immense, and my shins are black and blue. And that was before the wind ratcheted up a notch and broke my gooseneck!
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