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: "[email protected]" <[email protected]> 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. ITT accepts no liability for any damage caused by any virus transmitted by this e-mail. 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