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-   -   Downhaul rope, damaged (http://www.star-board-windsurfing.com/forum/showthread.php?t=12231)

Darko_Z 30th May 2011 02:51 AM

Downhaul rope, damaged
 
I have NS sails, S-Type 9,5, S-Type 7,8 and WARP 6,8 with NS PLATINUM mast. For all sails I need a lot of downhaul force if I want lose leech up to the mark. I use 4mm dyneema ropes, but tension on the rope is so high that rope is damaged in cleat just after a few rigging procedures. I have tried different mast base extensions with different cleats and different ropes, with same result. Now I want to now if others have same problem or if somebody knows the solution for this problem, because I canít imagine that people are changing downhaul rope for every rigging.

Roger 30th May 2011 09:16 AM

Hi Darko,
Are you rigging them all on the same mast?
The 9.5 would seem to want a very stiff 490 or 520 mast. (IMCS 29-32)
The 7,8 m2 would probably use a 460 IMCS 25 mast.
The 6.8 m2 would for sure need a 460 cm IMCS 25 mast.
If you rig on the correct mast, the downhaul tension should not be enough to damage your downhaul
line.
If you are trying to "bend" masts that are too stiff into your smaller rigs that need softer (more bendy) masts, then you can probably expect the downhaul tension to be sufficient to damage the downhaul line.
Also, look at your downhaul crank tool...... are there nice radiused edges on the hole through the crank shaft?
or fairly abrupt and sharp countersink edges that can cut/ damage your downhaul line.
Are you using one of the North Mast Systems.... with different tops and tapers?
Roger

Darko_Z 30th May 2011 04:37 PM

Downhaul rope, damaged
 
For WARP 6.8 and S_TYPE7.8 I use NORTH SAILS PLATINUM mast 460, and for S_TYPE9.5 I use NORTH SAILS PLATINUM mast 460 + CX carbon extension, as per NORTH SAILS specification demanded.
Rope was never damaged at crank tool it was always damaged in cleat.
I use PROLIMIT mast extensions, perhaps teethes in the cleat are to sharp.

IRL-250 1st June 2011 12:09 AM

I use Marlow Formula line and since switching over to this i have never had any Downhaul rope get damaged or break on me. Some of the formula line i have in my Chinook extensions is 3-4 years old and still going strong and i am rigging slalom sails that require alot of downhaul tension. Check out ebay and you usually see people selling it on there if you cannot source it where you live.

Hope this helps

joe_windsurfer 13th June 2011 05:34 AM

i started using dyneema cord recently too
yesterday i was surprised when i saw the downhaul slip $%^&*
this was with a MS TR-4 10-oh race sail
never saw it slip b4 $%^&*(
time to go back to the traditional cords ??
it was with a chinook base where i have NEVER had slippage before

anyone else had slippage at the down-haul cleat ??

IRL-250 15th June 2011 01:51 AM

Use Marlow Formula Line and you will have no problems with the downhaul slipping. I use it on all my Chinook extensions and have no problems at all

http://www.marlowropes.com/index.php...=86&Itemid=286

available to buy online here http://www.bigsurf.ie/prod.php?id=48

Quote:

Originally Posted by joe_windsurfer (Post 49884)
i started using dyneema cord recently too
yesterday i was surprised when i saw the downhaul slip $%^&*
this was with a MS TR-4 10-oh race sail
never saw it slip b4 $%^&*(
time to go back to the traditional cords ??
it was with a chinook base where i have NEVER had slippage before

anyone else had slippage at the down-haul cleat ??


BelSkorpio 15th June 2011 03:25 AM

Hi Joe,

Sounds to me like you have more a problem with the cleat of the chinook extension (perhaps too worn out) than with the Marlow formuline (also called dyneema). I know that the standard diameter of 3.8mm is often a little bit thinner than the usual down-haul lines, but I have not yet encountered a slippage on any of my bases (mostly NP).

joe_windsurfer 15th June 2011 04:28 AM

belskorpio:

yes, apparently the cleat can wear out !!!
have found the chinook CL250 clam cleat is about $16
also have another mast extension that i will try and then perhaps some older cord to see if "new stuff" is thinner than the traditional "rope"

thx bud !!!
http://joewindsurfer.com


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