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Tension at the clew level

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Created by yvanboniec > 9 months ago, 9 Mar 2012
yvanboniec

yvanboniec

16 posts
9 Mar 2012 2:37AM
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Does anyone know about the tension (measured in lbs or kg) exerted on the rope / line at the clew level ?

I am trying to figure out what cord/line I should use and how many times I should roll them back and forth between the clew and the sail.

Thanks

powersloshin

powersloshin

NSW, 1855 posts
9 Mar 2012 8:47AM
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I don't know the figure, but I would say it depends on the sail size. I have never broken the outhaul rope, I think any marine rope around 4 mm would do

Sailhack

Sailhack

VIC, 5000 posts
9 Mar 2012 9:53AM
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Strong winds/waves - tight (full-fist pull)

Marginal/low wind & blasting - loose (thumb & 2 fingers)

...that's about as technical as I get!

Stuthepirate

Stuthepirate

SA, 3591 posts
9 Mar 2012 10:05AM
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Any type of rope like this one would suit your down/outhaul needs fine.

www.whitworths.com.au/rope-s-spd-2mm-multi?q=180471

powersloshin

powersloshin

NSW, 1855 posts
9 Mar 2012 11:34AM
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How about this one?




:-)

qldnacra

qldnacra

QLD, 455 posts
9 Mar 2012 10:53AM
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yvanboniec said...

Does anyone know about the tension (measured in lbs or kg) exerted on the rope / line at the clew level ?

I am trying to figure out what cord/line I should use and how many times I should roll them back and forth between the clew and the sail.

Thanks


For the amount that you need even the most expensive Spectra type ropes are probably not going to go much over $10 or $12 so why even worry about it just buy the top of the line rope and be done with it

Stuthepirate

Stuthepirate

SA, 3591 posts
9 Mar 2012 12:27PM
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qldnacra said...
For the amount that you need even the most expensive Spectra type ropes are probably not going to go much over $10 or $12 so why even worry about it just buy the top of the line rope and be done with it


Agreed
Any yacht shop should be able to supply you with spectra braided rope for about $2 a meter. With a breaking strain fo roughly 720kg it's more than enough.

yvanboniec

yvanboniec

16 posts
9 Mar 2012 3:28PM
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I started windsurfing 25 years ago.

I used to windsurf lot, but did not much between the age and 25 and 40. Last year, I bought (I am now able to afford it) some brand new equipment to get back to the sport.

I am trying to find way to cut the time spent rigging the sail, and in fact all the unessecary time wasted to practice the sport (trying to find a shortcut on the road the reach the beach faster, trying to find a beach which is 20 meters from the parking space), so as to reduce whatever put me off the sports (mostly, rigging and carrying stuff).

Making 4 loops of cord on the wishboom clew put me off. I now know that I don't need to do that much.

Thanks all for your answers. I just woke up (I am on the other side of the planet) and it is nice to get up with all the answers to my questions.

wespyyl

wespyyl

WA, 118 posts
9 Mar 2012 3:33PM
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Just go to a windsurfing shop and get the best stuff they have.

It's much smoother than the cheap stuff and makes rigging easier.

It also lasts heaps longer than the cheap stuff without getting all furry and rubbing through.

decrepit

decrepit

WA, 12887 posts
9 Mar 2012 8:52PM
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powersloshin said...

I don't know the figure, but I would say it depends on the sail size. I have never broken the outhaul rope, I think any marine rope around 4 mm would do


Why would it depend on sail size or wind strength?
The max load on the rig is dependant on the force the rider puts on the boom, this is mainly related to riders weight and height.
But yes, 4mm should do the trick until it shows signs of wear.

powersloshin

powersloshin

NSW, 1855 posts
15 Mar 2012 11:53AM
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Why would it depend on sail size or wind strength?
The max load on the rig is dependant on the force the rider puts on the boom, this is mainly related to riders weight and height.
But yes, 4mm should do the trick until it shows signs of wear.


weight and height can only exert force on the boom to counteract the power of the wind, which in turn is proportional to sail size. So I think we are both 1/2 right, a heavier sailor can hold a bigger sail in stronger wind, which pulls harder on the clew.

paddymac

paddymac

WA, 943 posts
15 Mar 2012 10:44PM
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yvanboniec said...

I started windsurfing 25 years ago.

I used to windsurf lot, but did not much between the age and 25 and 40. Last year, I bought (I am now able to afford it) some brand new equipment to get back to the sport.

I am trying to find way to cut the time spent rigging the sail, and in fact all the unessecary time wasted to practice the sport (trying to find a shortcut on the road the reach the beach faster, trying to find a beach which is 20 meters from the parking space), so as to reduce whatever put me off the sports (mostly, rigging and carrying stuff).

Making 4 loops of cord on the wishboom clew put me off. I now know that I don't need to do that much.

Thanks all for your answers. I just woke up (I am on the other side of the planet) and it is nice to get up with all the answers to my questions.


My Aeron 150-200 boom has a nice time saving setup - I just thread the looped rope through the clew hole and over the boom fitting and then pull and cleat. Not sure if other brands have that system.

ginger pom

ginger pom

VIC, 1746 posts
16 Mar 2012 7:53AM
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4:1

Certainly no harder than you can pull with one arm standing up

russh

russh

SA, 3027 posts
16 Mar 2012 2:50PM
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ginger pom said...

4:1

Certainly no harder than you can pull with one arm standing up




There seems to be a lot of experienced pullers on this thread.

decrepit

decrepit

WA, 12887 posts
16 Mar 2012 8:42PM
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powersloshin said...


Why would it depend on sail size or wind strength?
The max load on the rig is dependant on the force the rider puts on the boom, this is mainly related to riders weight and height.
>>


weight and height can only exert force on the boom to counteract the power of the wind, which in turn is proportional to sail size. So I think we are both 1/2 right, a heavier sailor can hold a bigger sail in stronger wind, which pulls harder on the clew.



Maybe but I think my half is bigger than yours,

If underpowered you are right, a bigger sail or stronger wind will increase sail load, but the maximum load when fully powered, either with a small sail in strong winds or a large sail in light winds, will only depend on rider physiology.
Trying to increase that load by altering sail or wind will only result in sheeting the sail out, as the riders weight/leverage is overcome.

powersloshin

powersloshin

NSW, 1855 posts
17 Mar 2012 12:09AM
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decrepit said...

powersloshin said...


Why would it depend on sail size or wind strength?
The max load on the rig is dependant on the force the rider puts on the boom, this is mainly related to riders weight and height.
>>


weight and height can only exert force on the boom to counteract the power of the wind, which in turn is proportional to sail size. So I think we are both 1/2 right, a heavier sailor can hold a bigger sail in stronger wind, which pulls harder on the clew.



Maybe but I think my half is bigger than yours,

If underpowered you are right, a bigger sail or stronger wind will increase sail load, but the maximum load when fully powered, either with a small sail in strong winds or a large sail in light winds, will only depend on rider physiology.
Trying to increase that load by altering sail or wind will only result in sheeting the sail out, as the riders weight/leverage is overcome.

I think you are right, I also thought that the only other factor to be able to increase max load at the clew would be board width. Also i shouldn't have argued in the first place with such an avatar.. Cheers


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"Tension at the clew level" started by yvanboniec



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