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Go Back   SailNet Community > General Interest > General Discussion (sailing related) > Which way is the wind flowing???
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Thread: Which way is the wind flowing??? Reply to Thread
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Topic Review (Newest First)
04-08-2008 07:35 PM
chucklesR
Quote:
Originally Posted by T34C View Post
Chucky- You need to give up sailing and buy a jet ski!
No way, too fast for me.
Ironically I have a Crownline 250CR, 43 kts etc.
We hate it. Too fast. It's a 2005 and is for sale, has been since 2005. Take over payments and it's yours.

Many sailboats are faster than mine. Going over 8-9kts makes me nervous, I'm just not used to it yet, plus that whole turtle thing ya know.
04-08-2008 07:24 PM
T34C
Quote:
Originally Posted by chucklesR View Post
That is so sad Jeff, you mean ya'll really only get 5 kts of boat speed out of 10kts of wind on a beam reach?
I get better than 7, more if I fart often.
By 15 kts I'm breaking 10 boat speed on a beam reach, with or without farts.
Polar plot available

On the other hand, in 30 kts I'm cowering in the pilot house with the motor running
Chucky- You need to give up sailing and buy a jet ski!
04-08-2008 06:57 PM
chucklesR That is so sad Jeff, you mean ya'll really only get 5 kts of boat speed out of 10kts of wind on a beam reach?
I get better than 7, more if I fart often.
By 15 kts I'm breaking 10 boat speed on a beam reach, with or without farts.
Polar plot available

On the other hand, in 30 kts I'm cowering in the pilot house with the motor running
04-08-2008 06:30 PM
Jeff_H Assuming a typical boat with a hullspeed of 8 knots (static waterline = 36.6 feet) you could expect the following:

Beam reaching (90 degrees true) 10kts wind true:
Boatspeed- 5 knots, Ap wind- 11.2 kts, Ap Dir 64 degrees off bow

Beam reaching (90 degrees true) 15kts wind true:
Boatspeed- 7 knots, Ap wind- 16.5 kts, Ap Dir 65 degrees off bow

Beam reaching (90 degrees true) 30kts wind:
Boatspeed- 8 knots, Ap wind- 31,1 kts, Ap Dir 75 degrees off bow

Broad reaching (135 degrees true) 10kts wind true:
Boatspeed- 5 knots, Ap wind- 7.3 kts, Ap Dir 106 degrees off bow

Broad reaching (135 degrees true) 15kts wind true:
Boatspeed- 7 knots, Ap wind- 11.2 kts, Ap Dir 109 degrees off bow

Broad reaching (135 degrees true) 30kts wind true:
Boatspeed- 8 knots, Ap wind- 25 kts, Ap Dir 122 degrees off bow

Of course those numbers are dependent on your SA/D and L/D. The boatspeed numbers assume an SA/D around 16-17 and a L/D Under 200. A higher SA/D or lower L/d would yield a higher speed through the water at 10 knots of wind and at the 30 wind range. There would be little impact at the 15 knot range.

And I agree that tying yarn or taping cassette tape to your shrouds at eye level helps provide a sense of the apparent wind direction. You don't need to buy teletales.

Jeff
04-08-2008 05:58 PM
T34C
Quote:
Originally Posted by Hartley18 View Post
I have it on good authority that there is now more deer than sheep in NZ. Could be painful for any American sailors planning to visit.
They had to find a way to accomodate the taller Kiwi's!!!!

HAhahahahaha!! Obviously the Kiwi's reputation precedes them!

Aussie influenced! Lived in WA for a few years.
04-08-2008 05:57 PM
T34C
Quote:
Originally Posted by duffer1960 View Post
Using basic vector math, assuming on a broad reach the angle of the wind is 45 degrees aft of the beam, than any windspeed over 11.31 knots will feel like it's blowing from aft to forward; the faster the windspeed, the higher the forward component of the wind.
You are failing to factor in the forward motion of the boat, ie... appearent wind speed. As the true wind speed picks up so will the boats speed, to a point.
04-08-2008 05:33 PM
Plumper On a broad reach the wind will always feel like it is coming from the quarter otherwise it isn't a broad reach! Right? The higher the windspeed the faster the boat but it will still be on a broad reach with the wind over the quarter.
04-08-2008 05:29 PM
duffer1960 Using basic vector math, assuming on a broad reach the angle of the wind is 45 degrees aft of the beam, than any windspeed over 11.31 knots will feel like it's blowing from aft to forward; the faster the windspeed, the higher the forward component of the wind.
04-08-2008 02:52 AM
Classic30
Quote:
Originally Posted by T34C View Post
Unless you're from New Zealand, then you put the sailors on the sheep.
HAhahahahaha!! Obviously the Kiwi's reputation precedes them!

I have it on good authority that there is now more deer than sheep in NZ. Could be painful for any American sailors planning to visit.
04-07-2008 11:45 PM
T34C
Quote:
Originally Posted by Alden68 View Post
You put sheep on your sails??????????

Unless you're from New Zealand, then you put the sailors on the sheep.
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