I thought about this mainsheet tackle a little more and I think maybe there's at least one more problem with it.... I think there's a whole lot of friction in the system....
When the boom is outboard, and you try to haul the mainsheet, the lower block on the traveller twists and the line chafes against the cheeks. (imagine looking down on the block and tackles from above and you'll see what I mean). The cleat should be on a separate block so that you can trim the sheet from any angle. One thought is to use a put a hexacat base (a single block with cleat and swivelling becket, with or without a rachet) on the traveller, with a swivelling triple above it. see http://tinyurl.com/mjut9l for examples. You could increase the purchase to 8:1 by using one double block on the boom.... You'd have to figure out the best way to reeve the line to reduce friction from having the lines rub against each other. If the lines are chafing against each other, you may want to experiment with using "right angle reeving" instead of "parallel lacing" See http://www.harken.com/rigtips/Reeving_Diagrams.php for examples. Hope this helps, Fair leads, Judy B ________________________________ From: "Judith Blumhorst, DC" <[email protected]> To: [email protected] Sent: Thursday, June 11, 2009 3:56:43 PM Subject: Re: [IC27A] Re: Main sheet trim Tim, I took a look at the pic of your setup, which is pretty typical for the mid-boom C27 mainsheet. http://groups. yahoo.com/ group/IC27A/ photos/recent/ 1086047754/ view I can't be sure looking at the picture, but it looks like the lines might be chafing against the cheeks of the blocks and creating extra friction. The lead doens't look fair to me. If that's the case, using twisted shackles or swivels to attache the blocks to the bails will give you a more fair lead with less chafe and friction. Fair winds and fair leads, Judy B ________________________________ From: Lee Scott <lsc...@oldjags. com> To: ic...@yahoogroups. com Sent: Thursday, June 11, 2009 8:28:04 AM Subject: [IC27A] Re: Main sheet trim Tim, I just uploaded a photo of my setup to the photos section, under 'Blown Away' Lee Scott '87 C-27 #6350 --- In ic...@yahoogroups. com, Tim Millar <seascoutship76@ ...> wrote: > > Brandon, > > I've been thinking along those lines. Do you have a photo of your new > setup, or a parts list you could post? > > Thanks; I'm sure this will help Jeff also. > > Tim > 6254 > > > I have the same set-up as you but I haven't had the boat out sailing > yet. Anytime you go through so many turning blocks you add friction > to the system. What you describe does sound excessive though. I > decided to get a 4-1 or 6-1 purchase and just sheet directly from the > traveller. Freeing up my starboard winch and taking the friction out > of the system. SHould make it easier to race and singlehand also. > > Brandon > 5886 >
