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 Post subject: 10:1 main sheet system
PostPosted: Wed Mar 26, 2008 1:54 pm 
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Joined: Fri Aug 03, 2007 10:46 am
Posts: 1089
Location: eureka,california
is there a conversion for the old 8:1 main sheet system or do i need to buy a whole new system?

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 Post subject:
PostPosted: Wed Mar 26, 2008 2:48 pm 
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Location: Santa Cruz
Image

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 Post subject:
PostPosted: Thu Mar 27, 2008 9:09 am 
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Location: Vancouver, WA
Wow, that looks a mess. How do you reave that without friction between the wraps?

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 Post subject:
PostPosted: Thu Mar 27, 2008 10:40 am 
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Location: Mill Creek, WA
Surf City Catamarans wrote:
Image


Jeremy,
Are you using a double under the top block? And it looks like you terminate with a bowline through the airblock above the lower block.

And real men aren't afraid to run with purple sheets 8)

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 Post subject:
PostPosted: Thu Mar 27, 2008 11:14 am 
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Location: Jersey Shore
>>Wow, that looks a mess. How do you reave that without friction between the wraps?


I agree. Eventually you're going to reach a point of diminishing returns where the friction in the system exceeds the theoritical mechanical advantage. Might be better off just hiting the gym a little harder.

sm


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 Post subject:
PostPosted: Thu Mar 27, 2008 1:01 pm 
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Location: Australia
Harken sell a 5 sheave top block that makes it a lot easier to get 10:1. Unfortunately you need to go to a Nacra dealer as they are custom made for Nacra. Works well


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 Post subject:
PostPosted: Thu Mar 27, 2008 1:06 pm 
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Joined: Fri Aug 03, 2007 10:46 am
Posts: 1089
Location: eureka,california
joclo
Ifoung the 5 sheeve system at murrays marine, and my local hobie cat dealer is trying to find me one now through his suppliers. Go jeremy surf city catamarans can find anything and usually has the best prices.
(and if i don't buy from him his kid might go to a college without a sailing team)
jk
but thanks all for the input
i'll put picks up when i get the system from jeremy

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 Post subject:
PostPosted: Thu Mar 27, 2008 1:07 pm 
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Location: Santa Cruz
OLD SCHOOL 18 wrote:
Surf City Catamarans wrote:
Image


Jeremy,
Are you using a double under the top block? And it looks like you terminate with a bowline through the airblock above the lower block.


Yep to all that. I built this system over 4 years ago and it's still going strong. Now, Harken has a 5 sheave upper which simplifies things a little. I think the 5 sheave pulls a little funky myself, but that's what people are going with these days with minimal problems.

I just built a tapered mainsheet for the above system, and it got great reviews. I suck at tapering, but this once it came out pretty well. I used 6mm FSE Robline 8 plait dingy through the blocks and 8mm FSE Dyneema racing sheet in the hand. I won't show you a pic, you'd just laugh at how funky it looks. The materials are top notch, and functionally it works great, the execution is where is suffered.

Quote:
And real men aren't afraid to run with purple sheets 8)


I'm solid in my masculinity, D! :lol:

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 Post subject:
PostPosted: Thu Mar 27, 2008 1:13 pm 
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Location: Santa Cruz
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They are slightly back ordered from Harken, should be a few days.
They list for $175

Image

$434

We all get our parts from the same place, make sure to support you most local Hobie dealer, so they can support your local fleets and races.

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 Post subject:
PostPosted: Tue Apr 01, 2008 10:25 am 
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Location: Long Beach, CA
That double hanging on the triple's plastic becket will break. Mine did...it took about three years but Harken said that was a no-no and would not warranty it..

I am using the Quint on the top now with the triple and a double on the bottom, attached to a metal becket.

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 Post subject:
PostPosted: Tue Apr 01, 2008 10:33 am 
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Location: Vancouver, WA
Erf, anything past 8:1 starts getting really complicated. A center-sheeting 5:1 along the boom with a 2:1 cascade from sail to traveller starts looking less and less messy...

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 Post subject:
PostPosted: Tue Apr 01, 2008 6:02 pm 
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Location: League City, Texas, USA
tjp wrote:
Erf, anything past 8:1 starts getting really complicated. A center-sheeting 5:1 along the boom with a 2:1 cascade from sail to traveller starts looking less and less messy...


More stuff to get caught on when ducking underneath it. Plus does it give you enough adjustment range?

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 Post subject:
PostPosted: Tue Apr 01, 2008 6:14 pm 
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Location: Northfield Minnesota
I don't think those booms could support it anyway, at least not the round style.


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 Post subject:
PostPosted: Wed Apr 02, 2008 7:45 am 
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Location: Vancouver, WA
Karl Brogger wrote:
I don't think those booms could support it anyway, at least not the round style.
Probably not. Plus a center-sheet would get in the way of crew - more popular on the A-Cats. In that case, the 10:1 is in the usual spot and just the end of the sheet goes along the boom, so it's only 1/10th of the load axially on the boom, instead of 1/2 like my example.

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 Post subject:
PostPosted: Wed Apr 02, 2008 5:28 pm 
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Location: New Orleans, LA
Sooo, what system / ratio is the best if you had to upgrade now?

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