What blocks does the 10:1 system use?

It uses a 5 block on the top and a 3+2 block on the bottom. A regular 3 with a becket on the bottom with a 2 block attached to the becket.

Mike Hill
www.stlouiscats.com

Chris,
Alec and I suggest you try this system. Put two together, you might 10:1. Or more. Or less.

Bitchin' Mainsheet Hardware

It is probably the same I got for my Nacra F18 (2005),
Check the pictures:

and


and




It is working really fine.

Best

Sanyi
www.catsailing.hu

Sanyi, can you describe the tapered(?) mainsheet set up, and where does the the sheet terminate on the lower blk?

Thanks!

Dave

Sanyi, Thank you that, that’s what I was looking for.

Dave, I would guess the mainsheet dead ends by tying around or thru the block attached to the becket.

you can get a pre-tapered I20 mainsheet from a couple of places online. They have the length of the taper pretty darn near figgered out.

Can you tell us which websites?

Is the 10:1 now Class legal? (I am so out of the loop)

Yes - comes standard on the new Nacra 20s (and F18s).

Taken from INCA website Class Rules

http://www.nacraclass.com/northamerica/NAINDEX.htm

5.6a Main sheet purchase may not exceed 10:1 on any boat. Multiplier or
fine tuning systems (Magic Blocks) are illegal.

Soggy Cheetoh:

Sites that offer tapered mainsheets:
www.Onlinemarinestore.com -Rick's very own site here has them
www.sailmax.biz
And of course, me...:)

Dave,

lower block second picture:



From the Nacra I got the 3 blocks (up, down and the extra small one) and the tapered main sheet in the box.
After a half night of thinking finally I find out this solution to install…

Best regards,
Sanyi

Great! What is that blk attached to the becket, a carbo single? 29 or 40mm? What are the 2 line diameters, and the kind of line? I have a new carbo ratchamatic 8 to 1 that I'd like to convert to 10 to one, and I think I'm close. Thanks for the help!

Dave

lots of friction with that system even with the taper in the sheet.

why not use a cascading system inside the boom? much better to use, less than half the weight and cleaner boat as well.

attached is the system we use on the tornado and I cant see why it wouldnt work on a F18 / F20

Macca,

Most of the F18s are going to the thin round booms that couldn't possibly support this sheeting arrangement...we will, however, be considering it on our rectangular boomed boat - thanks for the tip!

Dave,

the attached blk is a 2650 BLK-40MM CARBO FIXED

the lines are swifcords, maybe 9mm and 5mm.

I also recommend you to order a pre-tapered sheet, because I agree with macca: the weak point of this solution is the tapered part of the sheet. It has to run smootly.

As Macca recommended you can also use boom-integrated sheet, as most of the T sailors, but I think it also has some (more) disadvantage.

First of all, you have to remove nerarly everything from the boom, clean it inside and also outside. Outhaull, rotator, negative rotator, etc.

Inside - of course you need a place for the running block
Ouside - yes, also - if there are rivet ends inside the boom, it can stop the running bolck.

In 2004 I visited a Volvo T race in Germany, and I made a few pictures, like this, and some additional.

That time I sailed an old Panthercraft Tornado so I converted my sheet soon. It is a 1:5 ouside x 1:2 inside.

Regards,

Sanyi