Youre welcome, brandon. There's an "oopsie" in my posting: I meant to say: "It's aruguably safer to have the boom BELOW the sail slot iin case you drop the halyard, the boom drops and the sail stop fails. "
Fair winds, Judy B ________________________________ From: Brandon Snider <[email protected]> To: [email protected] Sent: Saturday, May 2, 2009 5:12:53 PM Subject: Re: [IC27A] Re: Boom Height Thanks Judy, I spent a couple hours the other day reading all of your site, thanks for taking time to post all of that info. Brandon Snider On Sat, May 2, 2009 at 7:24 PM, Judith Blumhorst, DC <drju...@blumhorst. com> wrote: [Attachment(s) from Judith Blumhorst, DC included below] Hi Brandon, ... See the attached pictures of my tall rig mast, showing the top and bottom black bands. That gives you a visual for jhow high the mainsail is supposed to be hoisted It's the foresail that predominates on the C27's, not the mainsail. It's easier to understand the performance parameters of the C27, standard and tall rig, if you think in those terms. The taller mast and bowsprit are there mostly to permit bigger foresails. The tall rig does it's "magic" because the foretriangle is about 15% bigger than the foretriangle on the std rig. The TR mainsail is actually about 5% smaller than the std rig. It doesn't perform significantly better than the standard rig. Calling it is a "Tall rig" is descriptive in terms of the mast, but misleading in terms of the sailplan design. The boat performs better in light air because the foresail is bigger, not because the mainsail is taller. I don't think you'll gain much putting the mainsail up higher than intended. Yes, the wind is ever-so-slightly- faster one foot higher, but not significantly so. And there's a cost to moving it higher. The trade off is that the higher center of effort makes the boat more tender in a blow. The foot of the sail goes at the bottom black band, which is just below the sail-slot(cutaway) . The luff of the TR mainsail is 29.67" long, and the top of the TR mainsail is 29.67" above the lower black band. So the top of the mainsail should be about 10-12" below the top of the mast. I have the exact measurements written down somewhere, but I can't find it right now, and I forget exactly what the measurement is. The headboard on the mainsail isn't supposed to go to the very top of the mast, for a couple of practical reasons: 1. It's easier to hoist the sail up because of the angle of the halyard from the headboard to the sheave inside the mast-truck. The holes in the headboard, where the halyard attaches, are a little aft of the bolt rope ( or sail slides). If you try to hoist the mainsail all the way up to the very top of the mast, the headboard will be jammed against the mast. 2. The aft edge of the headboard, and possibly one or two battens, will get caught on the backstay if the headboard is pulled all the way to the top of the mast. By dropping the headboard, you gain more room between the roach of the mainsail and the backstay. If you have an original mast, the sail slot is supposed to be above the the boom. There's a good reason why the boom traditionally is below the sail track cutout. It's aruguably safer to have the boom above the sail slot iin case you drop the halyard, the boom drops and the sail stop fails. (Why there's a sliding gooseneck on a C27 is a mystery to me. A cunningham is much easier to adjust than a gooseneck downhaul!) Personally, I much prefer a fixed gooseneck when the weather turns bads. Fair winds, Judy B http://www.blumhorst.com/catalina27/catalinahomepage.htm ________________________________ From: Brandon Snider <richardbrandonsnide [email protected]> To: ic...@yahoogroups. com Sent: Saturday, May 2, 2009 9:50:07 AM Subject: Re: [IC27A] Re: Boom Height Thanks for all the replies. Its and old main and the luff rope has probably shrunk. Hopefully I'll get a new main soon, until then I may just let the boom ride above the mast gate as long as I can tension the luff enough, at least that way all my sail area is up high for better upwind performance. I'm sure it won't be great as the main is so old and baggy. I havn't flown it yet but the draft is probably way to far aft. I'll start with a measurment to see where I'm at. Thanks again everyone. Brandon Snider On Sat, May 2, 2009 at 12:34 PM, Bob <kniggit...@yahoo. com> wrote: Hi Brandon, Here is the link to the official C-27 specifications. http://www.catalina27.org/public_pages/bylaws-table.pdf The maximum allowed main sail luff for a tall rig is 29'8", so I would start by measuring your sail. If you take the plate off, the gooseneck will be able to come out of the sail track. It would be best to keep the boom below the sail entry slot even if it means having the sail below the top of the mast. Bob Stockley Sundance #2436 --- In ic...@yahoogroups. com, "joel5876" <joel5...@...> wrote: > > On the other hand, if you have a solid vang you should be just about to the > top. I do not have a plate and use a sailstop to keep the slugs in the slot. > you should not have to have your sail cut. > > > --- In ic...@yahoogroups. com, "Joe McCary" <joe@> wrote: > > > > Does your mast have a black band at the top and bottom? If so, there are > > the maximum rise and lower points for the main. You need some room at the > > top to clear the backstay. > > > > > > > > Joe McCary > > Aeolus II, West River, MD > > joe at photoresponse dot com > > > > > > > > From: ic...@yahoogroups. com [mailto:ic...@yahoogroups. com] On Behalf Of > > badfishy01 > > Sent: Thursday, April 30, 2009 7:54 PM > > To: ic...@yahoogroups. com > > Subject: [IC27A] Boom Height > > > > > > > > > > > > > > > > > > I just bought a 27 and raised the main that came wiht the boat. The head of > > the sail was about a foot from the top of the mast. The boom was hitting on > > the bottom of the removable mast track plate where you take the sail on and > > off from. My question is does your boom ride above or below this plate? If I > > take the plate off and let the boom ride above it the mainsail will go to > > the top of the rig. Or should I just keep the boom below it and get a > > mainsail cut taller? Thanks Brandon Snider Catalina 27 tallrig > > > > > > > > > > > > __________ Information from ESET NOD32 Antivirus, version of virus signature > > database 4047 (20090430) __________ > > > > The message was checked by ESET NOD32 Antivirus. > > > > http://www.eset. com > > > -- Richard "Brandon" Snider 843-616-3124 -- Richard "Brandon" Snider 843-616-3124
