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10:1 main sheet system

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hobie18rich

Post subject: 10:1 main sheet system

Posted: Wed Mar 26, 2008 1:54 pm

Site Rank - Old Salt

Joined: Fri Aug 03, 2007 10:46 am
Posts: 1067
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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Rich Vilvens
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Sail Revolution

Post subject:

Posted: Wed Mar 26, 2008 2:48 pm

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Joined: Wed Jul 21, 2004 7:46 pm
Posts: 1464
Location: Santa Cruz

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tjp

Post subject:

Posted: Thu Mar 27, 2008 9:09 am

Site Rank - Admiral

Joined: Fri Jul 08, 2005 1:30 pm
Posts: 260
Location: Vancouver, WA

Wow, that looks a mess. How do you reave that without friction between the wraps?

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OLD SCHOOL 18

Post subject:

Posted: Thu Mar 27, 2008 10:40 am

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Joined: Tue May 11, 2004 9:59 am
Posts: 280
Location: Mill Creek, WA

Surf City Catamarans wrote:

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

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srm

Post subject:

Posted: Thu Mar 27, 2008 11:14 am

Site Rank - Old Salt

Joined: Mon May 09, 2005 10:25 am
Posts: 2124
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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joclo

Post subject:

Posted: Thu Mar 27, 2008 1:01 pm

Site Rank - Deck Hand

Joined: Tue Oct 09, 2007 1:06 am
Posts: 15
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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hobie18rich

Post subject:

Posted: Thu Mar 27, 2008 1:06 pm

Site Rank - Old Salt

Joined: Fri Aug 03, 2007 10:46 am
Posts: 1067
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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Sail Revolution

Post subject:

Posted: Thu Mar 27, 2008 1:07 pm

Site Rank - Old Salt

Joined: Wed Jul 21, 2004 7:46 pm
Posts: 1464
Location: Santa Cruz

OLD SCHOOL 18 wrote:

Surf City Catamarans wrote:

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

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

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Sail Revolution

Post subject:

Posted: Thu Mar 27, 2008 1:13 pm

Site Rank - Old Salt

Joined: Wed Jul 21, 2004 7:46 pm
Posts: 1464
Location: Santa Cruz

They are slightly back ordered from Harken, should be a few days.
They list for $175

$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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Dan DeLave

Post subject:

Posted: Tue Apr 01, 2008 10:25 am

Site Rank - Old Salt

Joined: Thu Nov 13, 2003 10:00 am
Posts: 383
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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tjp

Post subject:

Posted: Tue Apr 01, 2008 10:33 am

Site Rank - Admiral

Joined: Fri Jul 08, 2005 1:30 pm
Posts: 260
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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flumpmaster

Post subject:

Posted: Tue Apr 01, 2008 6:02 pm

Site Rank - Captain

Joined: Mon Nov 22, 2004 7:18 pm
Posts: 72
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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Karl Brogger

Post subject:

Posted: Tue Apr 01, 2008 6:14 pm

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Joined: Sat Feb 24, 2007 8:45 pm
Posts: 1643
Location: Northfield Minnesota

I don't think those booms could support it anyway, at least not the round style.

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tjp

Post subject:

Posted: Wed Apr 02, 2008 7:45 am

Site Rank - Admiral

Joined: Fri Jul 08, 2005 1:30 pm
Posts: 260
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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KennyB

Post subject:

Posted: Wed Apr 02, 2008 5:28 pm

Site Rank - Captain

Joined: Thu Aug 05, 2004 9:13 pm
Posts: 56
Location: New Orleans, LA

Sooo, what system / ratio is the best if you had to upgrade now?

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