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
<[email protected]>wrote:
>
> [Attachment(s)<http://mail.google.com/mail/?ui=2&view=js&name=js&ver=Xz0jXTrYL5Y.en.&am=b7EopeS3cCFLDX3i1_Q2St-4gVqmqSQ#12103a5992a9e2cc_TopText>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 <[email protected]>
> *To:* [email protected]
> *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<[email protected]>
> > 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 <IC27A%40yahoogroups.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 <IC27A%40yahoogroups.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 <IC27A%40yahoogroups.com>
>> > > [mailto:ic...@yahoogroups.
>> com <IC27A%40yahoogroups.com>] On Behalf Of
>> > > badfishy01
>> > > Sent: Thursday, April 30, 2009 7:54 PM
>> > > To: ic...@yahoogroups. com <IC27A%40yahoogroups.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 <http://www.eset.com/>
>> > >
>> >
>>
>>
>
>
> --
> Richard "Brandon" Snider
> 843-616-3124
>
>
>
--
Richard "Brandon" Snider
843-616-3124
