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Re: Mainsheet blocks [Re: waynemarlow] #185993
07/23/09 03:33 PM
07/23/09 03:33 PM
Joined: Feb 2004
Posts: 3,528
Looking for a Job, I got credi...
scooby_simon Offline
Hull Flying, Snow Sliding....
scooby_simon  Offline
Hull Flying, Snow Sliding....
Carpal Tunnel

Joined: Feb 2004
Posts: 3,528
Looking for a Job, I got credi...
Originally Posted by waynemarlow
Does anyone have an idea on how to splice D12 onto a conventional sheet, I want to change to an 8:1 but it will mean my sheet is too short, easiest would be to splice in a smaller sheet for the section that does'nt emerge through the ratchet block.


What's the "conventional" sheet? It's easy with Maffi!


F16 - GBR 553 - SOLD

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Re: Mainsheet blocks [Re: scooby_simon] #185994
07/23/09 03:46 PM
07/23/09 03:46 PM
Joined: Sep 2005
Posts: 893
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waynemarlow Offline
old hand
waynemarlow  Offline
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Joined: Sep 2005
Posts: 893
Mine is an outer cover with an inner core.

Re: Mainsheet blocks [Re: waynemarlow] #186006
07/23/09 05:30 PM
07/23/09 05:30 PM
Joined: Oct 2008
Posts: 126
Southampton UK
NacraKid Offline
member
NacraKid  Offline
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Joined: Oct 2008
Posts: 126
Southampton UK
I've gone off maffi on the f18, they kink and knot easily and absord lots of water.

With a conventional sheet you want to pull out the inner core for about a foot, stuff the d12 up it and cut it to how long you want it to be, whip the d12 furthest into the sheet so it stays there, pull it about half a foot from the end, taper the outer core stuff it up the d12

Re: Mainsheet blocks [Re: Matt M] #186050
07/24/09 04:27 AM
07/24/09 04:27 AM
Joined: Jul 2007
Posts: 976
France
pepin Offline
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pepin  Offline
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Joined: Jul 2007
Posts: 976
France
Originally Posted by Matt M
Originally Posted by pepin
If I ever need a new system I'd probably go for an in boom cascade. [...]

Most boats now use a direct block to sail connection. This means the sail cut has to be boat specific, but the boom can be very light as there is just a minor compression load on it.

To go cascade you now have all the loads being sent into and through the boom plus the added compression load from the internal cascade. You need a bigger stronger boom for this plus the added room needed to mount the cascade.[...]

I was talking about it in the context of my current boat. I have right now a direct connection between the clew of the main and the blocks, around the boom. But I'm going to switch back to connect the boom to the blocks. My main clew is a little too far forward and when I sheet in hard upwind it pulls the foot of the sail tight. I also like the fact that when connected to the boom the mainsheet applies positive rotation to the mast.

My boom is beefy enough to take the loads. Anyway, it's a theoretical discussion: as long as my blocks are working I don't see the point of changing them...

Re: Mainsheet blocks [Re: tshan] #186406
07/29/09 01:23 AM
07/29/09 01:23 AM
Joined: Jan 2004
Posts: 196
Arkansas, USA
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CaptainKirt Offline
member
CaptainKirt  Offline
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Joined: Jan 2004
Posts: 196
Arkansas, USA
Tshan-
Did you note the actual boat in the photo did NOT have that bottom block but clearly a single large ratchet block at the bottom with multiple sheave on top??
Mike used the 10:1 off one of his other boats at the Horn Island Hop and really liked it he told me. Per my understanding the larger the diameter of any block the less the rolling resistance, all other factors equal, so I favor a quad/quint(?) at the top. If going center sheeting can easily make a 2:1 "doubler" system- already have to have stronger boom- but any cascading system will have a set "range" of adjustment- at least at it's maximum purchase.

Kirt


Kirt Simmons
Taipan, Flyer
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