Randy, in a purchase system only one of the blocks is fixed. Such as at the mast collar. The other block of the purchase system moves as you adjust the Cunningham and the hook is attached to this block. I took it one step further and ran a line through the cringle and attached the line to the boom. My 4 to 1 block and tackle is pulling on a 2 to 1 line through the sail resulting in a 8 to 1 ratio. It is easy to hand tension.
Maybe a picture will help. https://drive.google.com/file/d/0B8pEh5lnvP1yRmJZSUtwSWR0ZUU/view?usp=drivesdk You can easily see the 4:1 (I actually think it adds up to 5:1) with the dark green w/white fleck pulling down on the white w/green fleck and red tracer. What you can't see is that the white line runs through the sail about a foot above the tack and then attaches to the boom (tack pin for convenience). https://drive.google.com/file/d/0B8pEh5lnvP1yRDdIMENkSmE4U3M/view?usp=drivesdk The weight rating of the blocks you choose is irrelevant. It is completely unnecessary to apply any more than 200 or 300 lbs of tension at most. Extreme luff tension is more likely to damage the sail than improve sail shape. At 300 lbs you'd pull 30 to 75lbs by hand depending on the final purchase ratio. You'll care more about the size of the line you choose based on stops, jammers, cleats, winches, and feel in the hand - the block rating will convey based on line diameter. 5/16ths is probably as small as you will want to go for feel but 1/4 would work fine too as long as your other equipment can support. Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On Fri, Nov 24, 2017, 9:00 PM Randy Stafford via CnC-List < cnc-list@cnc-list.com> wrote: > Thanks Dennis. I’ve got the cunningham, just not the purchase. Mine goes > from hook in cunningham cringle down to cheek block at mast base, back up > to jam cleat on mast. I also use it to reef. > > The two other blocks listed in the owner’s manual table I’m sure gave it > 4:1 purchase. I’m guessing the one with the becket may have been shackled > to the mast collar, and the other one fastened up near the gooseneck > somehow - that’s the bit of info I’m missing. > > Cheers, > Randy > > > On Nov 24, 2017, at 5:53 PM, Dennis C. via CnC-List <cnc-list@cnc-list.com> > wrote: > > Randy, > > You can make your own easily enough. Touche' uses a couple of small > Ronstan fiddle blocks and a cunningham hook. > > I fastened a padeye at the base of the mast. I had to add a base under > the padeye to stand the block off the mast a bit. A fiddle block with > becket is attached to the padeye via the block's shackle. Above it is > another fiddle block. Attached to the upper fiddle's shackle is a length > of high tech line with a cunningham/reef hook. The purchase is 4:1 for > easy control. > > The cunningham sheet runs after to a Spinlock Powercleat (older version of > a Spinlock PXR cam cleat). > > You can see the lower block on the aft side of the mast here (right side > of pic): > > https://drive.google.com/open?id=0B_sb5TfIENvsSlRKb1pDdHdoSW8 > > We also use the cunningham to reef the main. > > I'll be on the boat in a couple days if you want better pics. > > Dennis C. > Touche' 35-1 #83 > Mandeville, LA > > On Fri, Nov 24, 2017 at 5:21 PM, Randy Stafford via CnC-List < > cnc-list@cnc-list.com> wrote: > >> Listers (especially 30-1 owners) - >> >> The 30-1 owners manual Table 4, “C&C 30 Blocks”, lists one 1750-lb single >> block, one 1750-lb single block with becket, and one 1200-lb cheek block >> for cunningham usage. Grenadine doesn’t have the 1750-lb single blocks for >> her cunningham; just the cheek block at the starboard base of the mast, and >> a jam cleat a few feet up from there. How was the cunningham on a 30-1 >> originally rigged, does anyone know? >> >> Thanks, >> Randy Stafford >> S/V Grenadine >> C&C 30-1 #7 >> Ken Caryl, CO >> _______________________________________________ >> >> Thanks everyone for supporting this list with your contributions. Each >> and every one is greatly appreciated. If you want to support the list - >> use PayPal to send contribution -- https://www.paypal.me/stumurray >> >> > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > > > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > >
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