Wednesday, September20, 2017 L-36.com

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Finding Target Boat Speed to Windward

course

How do we get to the mark fast?

When sailing toward the windward mark I always wondered, should I point high, or should I fall off a little for more speed. Some boats are blessed with instruments that give them these answers. They know how high to point and how fast to go to get them to the mark quickly. My boat is simple. I have a hand held wind meter, a knot meter, and a masthead fly. How can I know what the best point of sail is?

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Try the L-36 Weather and Tide Page Now!

Enter your "CITY, ST" or 5 digit zipcode here :

Examples of valid inputs: "San Francisco, CA" "Golden Gate" "Balboa" "Cow Island" "94301"
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User comments about the Weather and Tide Page from Forums and emails

  • Your site is now my primary weather information. While I really like the way NOAA provides info at their sites, yours is more comprehensive and easier to use
  • Your website is approaching world class. Really Great Job.
  • Keep up the great work, The 4 people I sent the link to loved it.....
  • Been playing with it off and on all week. It's already replaced my usual weather info site. Excellent work.
  • I just wanted to thank you for the terrific weather page. It is my daily go-to page for marine weather. I sail a pair of boats on SF Bay and out of Santa Cruz, and your web site is really extremely handy. It is far better than the "commercial" sites, which is a real tribute given their budgets and what yours probably is.

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Soft Shackles

This is the introduction to a series of 6 pages that deal with soft shackles. Step by Step instructions on How to make a soft shackle, some Variations, and some detail on the diamond stopper knot, . . These are incredibly strong. I show how they are used, below. Nothing is useful until it has been tested , so check that page out. There is even a Calculator so you can make them come out the length you want. Enjoy the series.

vel To the left is a picture of the soft shackle on the jib clew. The addition of the Velcro keeps the diamond knot in the center of the clew ring where it will stay out of the way of the rigging. These shackles are very strong. I did some testing and it is clear that the sheet with the eye and the soft shackle is much stronger than the sheet with the bowline. In my testing, the line broke at the bowline. You can follow the links above and see how to make them, as well as the testing that I did. I did the testing at 2/3 scale which is a little less than 1/2 the strength. The test at the bottom of the page was done to distruction of a link line made of the same Amsteel thus showing that a soft shackle is stronger than the line it is made from. On the rest of this page, I show how to use a soft shackle.

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Weather Reporting Stations

Enter your location by clicking on a map and the page is set up. All Buoy, Data Stations, and Ships reporting will have their data displayed. The report shows the following:
  • Station Name
  • Distance from your selected location
  • Age of the report in minutes
  • Wind speed in knots
  • Wind Gusts
  • Wind Direction
  • Air Temperature
  • Water Temperature
  • Wave Height in feet
  • Pressure (and change)
  • Dew Point of Visability

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Double Soft Shackle

This double ended soft shackle is the 4th generation of a design that can attach to a pair of eye spliced jib sheets to the clew of a sail very quickly. It is also the 5th version of this generation as improvements were made to make the shackle stronger. In use, the shackle is secure around the jib sheet prior to being "clipped" to the clew. This version is easy to make and has the advantage of a non-constricting hold on the jib sheets. There are links to the previous versions at the bottom of this page

The Shackle

s8_1

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Main Halyard Soft Shackle Variation

hs_2/h2_2.jpg This soft shackle in integral to the main halyard. It is made from a single line with a combination of knots with a finishing splice. I have tested it to over 1000 pounds using 3/16 Amsteel without slip. While I have not tested it to destruction it is very likely that the shackle is stronger than the line so that the failure would be outside of the shackle area. I base that on the fact that the shackle area is made of either 2 or 4 lines so any loss due to the knots is unlikely to bring the strength below line strength. Of course, a halyard is typically not loaded that high as the application is mainly stretch limited. That said, be sure to do your own testing before using this in any critical application.

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mm2011

We were happy on Papoose to have won our class but sad that one of our fleet was so badly damaged. Eventide was damaged just before the start by a boat from another class.
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Eventide T-Boned in MM Regatta

collision2

"Eventide was badly damaged at the start of the 2011 Master Mariners. She is safe in her slip in Berkeley and I am making a plan and exploring options for repairs and replacement rigs. I am extremely grateful for the support of the L-36 and Master Mariners community. Damage appears to be limited to her planking and obviously her rig. I will keep the L-36 community updated as to her status. Any previous experience or advice on repairing a large section of an L-36's hull is welcome. I can be emailed directly at gregmilano(at)hotmail(dot)com. Thank you for all of your support."
Greg Milano, Eventide


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My harbor early one morning
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Soft Halyard or Line Shackle


soft_halyard_and_stopper_loop

I am calling this a soft halyard or line shackle as it is certainly not confined to use only on halyards. It is a combined splice-shackle and is similar to a soft shackle where the opening eye is on the line and the knot is on a second piece. It is much faster to use than a soft shackle. In applications where the line is 12 strand spectra such as Amsteel, this is a perfect fit. I have tested it to destruction and the failure was similar to other tests of soft shackles which broke at the diamond knot. Based on all these tests, my conclusion is that it is 80-90% as strong as the line. I must add, the force I put on my 1/8 inch Amsteel using a hydraulic jack was huge, many times the force I got using a Barient 22 winch even with 1/8 inch line. In other words, this is a strong, easy to use shackle is integrated into a line such as a halyard. The line in all these photographs is 3/16 Amsteel Blue.


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The headline reads:

Lightning strikes a boat in Wisconsin and the boat sinks in less than an hour......

On Wednesday, June 8th, 2011 as the sailboat fleets made their way in from the evening races, they were glad to beat the thunderstorm that was coming in from the west. Just at dusk eye witnesses saw a lightning bolt hit a 30 ft ketch swinging on a mooring in McKinley harbor, downtown Milwaukee. " It lit up like a Christmas tree" was how one observer described the event. Within an hour the boat was under water with just portions of the masts showing.

Through Hull and Bonding

Notice the wire going to the through hull in the picture below. Also notice the grounding clamp around the through hull where the connection was made.
151000-boat-strike-2
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Bonding and Corrosion

There are few if any topics in yachting that have as much myth and misinformation surrounding them as does the question of bonding various pieces of your boat together. There is a very good reason for this confusion as the requirements surrounding bonding conflict. It is important to understand when bonding is good and when it is bad so that you can know when you should and when you should not bond. I hope this article will help to clear up some of that confusion. I will try and present the topic in an understandable way so that you can make decisions based on knowledge rather than on opinion or myth.

The "big picture" questions that need to be answered are:

  1. What does bonding actually do?
  2. Why do you want to bond pieces of your boat together?
  3. Why do you want to have pieces of your boat isolated (not bonded)?

If we can answer these questions we can make intelligent decisions about what to do.

What does bonding actually do?


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tp52s
Two TP-52s
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Disclaimer:
The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerious of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.