What you point out is a truism: the true wind angle is always larger than apparent wind when going to weather (and smaller when off the wind). But the terms beating, close reach, broad reach, etc are based on apparent wind. When I sheet in the genoa and beat upwind at 28-30 apparent, the true wind angle is somewhere around 40-45 (Imzadi will tack through a bit less than 90 degrees in the right conditions.) If the reference to beating, close reach, etc were based on true wind, none of us would ever be able to get beyond a close reach.
And my comment about getting hull speed (7+ knots) in 7 or 8 knots of true wind at 60 degrees apparent was by way of comparison with your response to Tom Vincent that a boat with an A sail would not be able to roll a boat with a light #1. Rick From: CnC-List [mailto:[email protected]] On Behalf Of dwight Sent: Tuesday, December 10, 2013 9:44 AM To: [email protected] Subject: Re: Stus-List Bowsprit/assym Rick You wrote: "It is pretty cool to be making hull speed in a 7 or 8 knot (true) wind at an angle of 60 degrees apparent" Correct me if I am wrong please; I may have misunderstood something: but for those conditions I think that the the true wind angle is actually aft of beam by about 20-25 degrees.hardly a close reach, more like a broad reach. I don't think the boat is going to weather under those conditions so the asym should work OK _____ From: CnC-List [mailto:[email protected]] On Behalf Of Rick Brass Sent: December 10, 2013 10:02 AM To: [email protected] Subject: Re: Stus-List Bowsprit/assym Dwight; Like Tom, I use a cruising A sail for my regular spinnaker. It is 1.5 oz, so I use it up to about 10 knots of wind. More wind than that and I am taking a chance of shredding the relatively light material. Going to weather in 10 knots true at 60 degrees apparent brings the apparent wind up to 16-17 knots, and that puts a lot of strees on the sail. The A sail can be used over a range of about 50 degrees apparent to about 140 degrees apparent. It does really well on a close reach - to the point that I stopped carrying my light #1 as being unnecessary. At above 10 knots true, I would be using my regular #1 anyway. A genoa is, indeed, a better choice than the A sail if you need to go close to the wind, but from a close reach to a broad reach, the A sail is much faster if the wind is not too strong. It is pretty cool to be making hull speed in a 7 or 8 knot (true) wind at an angle of 60 degrees apparent. The A sail falls on its butt when you run deep. I have, on occasion, used the spin pole to pull the tack of the sail out around the headstay, but I can't say I've ever been really happy with the results. I'm certainly no faster than any boat with a symmetrical spinnaker that can run at a deeper angle, and on a more direct line, than I can. I had bought a pretty decent used symmetrical spin from Dennis C that I used in races once or twice each year, in events that I knew would involve deep running. But I only put it on the boat for use at those races, and took it off for the rest of the time. The symmetrical spin was lost in a garage fire this fall. I may look for another used sail in the spring, but I'm not sure. The A sail is better for all around use and for cruising. Rick Brass Imzadi -1976 C&C 38 mk1 la Belle Aurore -1975 C&C 25 mk1 Washington, NC From: CnC-List [mailto:[email protected]] On Behalf Of dwight Sent: Monday, December 09, 2013 2:14 PM To: [email protected] Subject: Re: Stus-List Bowsprit/assym Tom You wrote when the wind is on the beam or forward of it, the sail will having you moving through the fleet I think this depends on wind strength.maybe true in very light air but I believe all things otherwise being equal a good light #1 would be hard to roll over in anything but the lightest winds and the deepest wind angles _____ From: CnC-List [mailto:[email protected]] On Behalf Of TOM VINCENT Sent: December 9, 2013 2:53 PM To: C&C Forum Subject: Stus-List Bowsprit/assym It should be very obvious to the group, there are advantages and disadvantages to flying an asymmetrical shute. I have been racing with an asym for 5 years and have learned that when the next mark is dead down wind - you need to fall off and gybe. The boats with the regular shutes will eat you alive if you try to go it their way. I have done wing to wing on several occasions when the mark was fairly close. My asymmetrical was cut by JSI in Florida and they did a great job, it has a 180 percent girth with 1090 sq. ft.. One of the advantages is when the wind is on the beam or forward of it, the sail will having you moving through the fleet. I have the tack running to the anchor bow roller with a snap shackle, I can haul in the tack very tight when pointing. When cruising short handed, I have an ATN sock. Tom Frolic II, 36' cb Chesapeake City, MD _____ No virus found in this message. Checked by AVG - www.avg.com Version: 2012.0.2247 / Virus Database: 3658/6403 - Release Date: 12/09/13 _____ No virus found in this message. Checked by AVG - www.avg.com Version: 2012.0.2247 / Virus Database: 3658/6406 - Release Date: 12/10/13
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