Hi Judy, It seems we have given Derek similar but different advice on his jib car placement....
It was my understanding that our imaginary line should bisect the leech/foot angle, thereby pulling the foot and leech equally. Is this correct? Bob Stockley Sundance #2436 --- In [email protected], "Judith Blumhorst, DC" <drju...@...> wrote: > > Ditto what Jack says.... and I'd like to add some.... > > As Jack says, the "right" spot for the sheet blocks depends on the position > of the tracks, the height of the clew on the 150, and conditions. But a good > approximate location can be found using the following method: > > On a windless day at the dock or on a mooring, with the bow pointing into the > wind, raise the genny. Pull the jibsheet aft tightly and down the trak for > the blocks, so that the sheet forms an imaginary line that's PERPENDICULAR to > the forestay. Mark that spot on the track. That's where a good sailmaker > expects the sheet block to be in "average" conditions. > > The following info comes from an article I wrote a decade ago. It's > specifically written about a Potter 19, with a fractional rig, but the same > general concepts apply to a masthead rig. > > Ideally, on a sloop rig, you want the curve in the leech of the jib to match > the shape of the *draft* of the mainsail. Then the airflow over the two > sails is smooth, without turbulence. (BTW, the is no airflow "through" the > slot. That's a misconception that modern sail theory has thoroughly > discredited) > > The full article can be found on my website at http://tinyurl.com/maj6p7: > > > (This is a very simplified explanation. You can read more in Maloney's > Chapman Piloting, 62nd edition, page 228-235; and Rousmaniere's Annapolis > Book of Seamanship, 2nd edition, starting on page 70. Illustration by Mark > Smith, from The Annapolis Book of Seamanship) > > > FIGURE 1: > Left: The lead is too far aft. The top of the jib stalls easily (the top > telltale lifts first when you sheet in). The leech is too loose and the foot > is too tight. > > > > > ________________________________ > From: "johnr...@..." <johnr...@...> > To: [email protected] > Sent: Monday, July 20, 2009 8:42:54 AM > Subject: Re: [IC27A] First Sail on The C27 - have a few questions > > > > > There is no THE position for the genny cars.? It depends upon wind conditions > and your particular sail.? The simple answer is that your tell tales should > be breaking evenly from top to bottom.? To accomplish this in different wind > conditions one moves the cars back and forward until good sail shape is > achieved.? Many genny's have a line of reinforcing stitching at the clew that > one can use as a guide.? This is true of my Air Force sails.? When the sheet > is pulling in line with this stitching, the car is usually properly set for > the conditions.? Generally, one will have the cars further forward in light > air and further back in heavy air.? The? "proper" set for the car on one side > may not be the same as for the other side as wind and wave conditions may > dictate different settings.? Usually, this difference would only be one hole > further forward or aft.? Irregularities in tune might also show up as a need > for different car settings.? I assume you are not > racing, but it is nice to sail efficiently even when cruising. > > I have both the center fixed topping lift, useful at mooring (it has a clip > that closes and ensures it will not jump off), and a topping lift that allows > free movement of the boom with the main up.? It can be very dangerous to have > your boom held fixed in position with the main up.? Best rig a topping lift > that will allow the boom to swing unless you want to give the boat and > yourself a good bath.? Blood in the water is not recommended. > > John McLaughlin > SR #1994 > Shambhala > > -----Original Message----- > > From: Derek Atkin <atkin...@yahoo. com> > > To: ic...@yahoogroups. com > > Sent: Mon, Jul 20, 2009 11:08 am > > Subject: Re: [IC27A] First Sail on The C27 - have a few questions > > My halyards are external. original wire/rope. I will take some more detailed > shots of what is there. I don't really plan on using the spinnaker any time > soon - but don't want to remove the hardware just yet. > > The boat does have a topping lift. I have been using that cable as a > secondary limiter on the end of the boom when the boat is at rest. > > Derek.- > > ____________ _________ _________ __ > > From: "Sneddon, Keith - ES/IS" <keith.sneddon@ itt.com> > > To: "ic...@yahoogroups. com" <ic...@yahoogroups. com> > > Sent: Monday, July 20, 2009 10:22:20 AM > > Subject: RE: [IC27A] First Sail on The C27 - have a few questions > > I agree. It's not really a topping lift. I have one, but only use it at the > dock. > > Keith Sneddon > > #4760, "Are We There Yet?" > > ____________ _________ _________ __ > > From: ic...@yahoogroups. com [mailto:IC27A@ yahoogroups. com] On Behalf Of > John Guttridge > > Sent: Monday, July 20, 2009 10:18 AM > > To: ic...@yahoogroups. com > > Subject: RE: [IC27A] First Sail on The C27 - have a few questions > > That little pigtail on the backstay is a poor excuse for a topping lift. > > I had it shake out and drop the boom on someone's head while dropping > > the main in heavy winds. I would recommend rigging a real topping lift > > that allows the boom to swing freely and can't shake out. > > From: ic...@yahoogroups. com<mailto:IC27A% 40yahoogroups. com> [mailto:IC27A@ > yahoogroups. com<mailto:IC27A% 40yahoogroups. com>] On Behalf Of > > David Savlin > > Sent: Monday, July 20, 2009 10:12 AM > > To: ic...@yahoogroups. com<mailto:IC27A% 40yahoogroups. com> > > Subject: Re: [IC27A] First Sail on The C27 - have a few questions > > Hi Derek, welcome to IC27A ! I'll join Brian in answering with the > > caveat > > that every boat can be different and yours is older than mine. > > 1. Headsail (and mains'l) halyards -- we don't have any cable on our > > '88. > > It's rope line all the way. The only rope-and-cable rigging we have is > > for > > our topping lift. Do your halyards all run inside or outside your mast? > > If > > inside I'd look at the sheaves (the rollers) and see if they are > > cable-sized > > or rope-sized. I don't see any deck organizers near the base of your > > mast, > > whereas we've normally got 4 lines that are run all the way to the > > cockpit's > > forward edge for halyards. > > 2. We have a 150 jenny too, we keep our rail cars a little forward of > > yours > > -- roughly even with the cabin entryway. We only ever move them if we're > > flying a spinnaker. > > 3. Yeah, that does look like your topping lift. > > 4. This is normal on every Catalina my family has ever owned (30, 42, > > and > > this 27). > > 5. That's a good question. See point #1 above ... can't really tell. > > I'm no expert so take my comments as that of a lazy day sailor. Fair > > winds > > to you! > > David > > On Mon, Jul 20, 2009 at 7:02 AM, Derek Atkin <atkin...@yahoo. > com<mailto:atkin11j % 40yahoo.com> > > <mailto:atkin11j% 40yahoo.com> > wrote: > > > > > > > > > Yesterday was the first time I was able to get out and get the sails > > up > > > after 10 months of work on my 79 C27. I have a few questions about the > > rig - > > > and posted a few pics here: > > > > > > http://www.opus45. com/c27rig/ > > > > > > 1. I might have some issues with halyard length. The headsail halyard > > seems > > > to be to long - by the time I get it down to the winch I am on steel, > > no > > > rope left. Does the headsail halyard run through a block on the deck > > first? > > > > > > 2. Any guidance on placement of the genoa sheet cars on the track? The > > sail > > > is a 150. > > > > > > 3. What is the steel cable with the clasp dangling from the backstay? > > > > > > 4. I assume that its normal that the genoa hits the front pulpit a > > bit? > > > > > > 5. Is it the Spinnaker halyard that runs through the block on the base > > of > > > the mast and back to the cockpit? or is that the link for the > > spinnaker > > > pole? > > > > > > Thanks for the info. > > > > > > Derek A. > > > #4297 > > > > > > > > > > > [Non-text portions of this message have been removed] > > [Non-text portions of this message have been removed] > > ____________ _________ _________ __ > > This e-mail and any files transmitted with it may be proprietary and are > intended solely for the use of the individual or entity to whom they are > addressed. If you have received this e-mail in error please notify the sender. > > Please note that any views or opinions presented in this e-mail are solely > those of the author and do not necessarily represent those of ITT > Corporation. The recipient should check this e-mail and any attachments for > the presence of viruses. 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