Monday, January22, 2018

Welcome to

Dedicated to the enjoyment of yachting and sailing


How to Point Higher

NOTE: This is an article I wrote for our local yacht club newsletter. For background, so far this season I have come in first 6 times and second once. Last race we won by 4 minutes in a 6 mile race.

Resource id #11
I have been racing at SPYC for 5 years and that represents almost all my racing experience. I am thankful to the club for this experience and it has helped me a great deal to become a better racer. I am also grateful to other skippers who are far better racers than I will ever be for sharing many insights and tips on sailing. While I do not consider myself an expert racer, I would like to continue the tradition of sharing what I have learned in hopes of making other boats faster as well. In my case, there are two things that help Papoose win races. One is having lots of wind when racing against much lighter boats. The other is pointing ability. It is my hope that this article might help other people discover new pointing ability in their boats.
Read More


More Low Friction Rings

In the first article of this series we gave results on using fairleads and showed how the added friction is not significant with low deflection angles. In this article we consider using low friction and other standard rings with high deflections and analyze how these can be used in systems to provide simple and inexpensive mechanical advantage. Again we used the digital scale shown on the right to make the measurements. This scale reads up to 220 pounds with 1/2 pound resolution.

Read More


Fairlead Friction Uncovered

Have you ever wondered hom much, if anything, you are giving up by using fairleads instead of blocks? How much friction is there. How does this compare with a block? Does the style of the fairlead matter? This article attempts to answer these questions.

Using a digital scale, I was able to compare the no fairlead force required to just move my weight against the turning block that I had on the test bench to the force required to move the weight when there was a bend through one of two types of fairleads. I took data at many angles with both fairleads. I also took some data with different line types, specifically Samson XLS and Amsteel.

Read More


Jibsheet Fairleads

Do you find that you get wraps on your jib winches or just want give a better lead angle to the winch? In the last race we did, a new crew member got a wrap so tight that the only way to release it was to cut the sheet with a knife. We strung the lazy sheet to the secondary winch and took the pressure off but that was not enough to free the wrap, that is when the knife came out. The winch manufacturer recommends between 3 and 8 degrees as the ideal sheeting angle.

Read More


Unique Mainsheet System Analyzed

It isn't often you see a completely new way to rig a mainsheet. I saw this posting on Sailing Anarchy and though I would share an analysis of what they are doing and why. Here is a picture of the boat

Read More


More on Rings as Twings, Inhaulers, and Fairleads

I have several articles on using rings as inhaulers and twings. This can be taken to extremes and the jib car can be eliminated and just the twing and inhauler used. It not only can be, that is how the TP-52 fleet is rigged. Here are some pictures to show it. This is a picture I took a couple of years ago at the Big Boat Series in San Francisco of the TP-52 Mayham
Read More


Calibrating a Marine Compass

Everyone understands that a marine compass needs to be calibrated. I am not an expert on compass calibration but got interested in the question when a club member asked me if I had an article on the subject on this web site. It is easy enough to find articles on how to calibrate a marine compass but I found them lacking in two areas. First, they did not explain what was really going on such that I could understand why things were being done. Second, they all recommended you don't actually do the calibration yourself but rather hire an expert. Of course, because I only was presented with a how and a recommendation not to do it, I did not have the knowledge to judge if the procedure was going to be error prone if I did it without some of the fancy tools the professionals have. I kept thinking about it and doing a few experiments until I felt I understood what the goal of all these measurements was and how accurate they needed to be. Of course, I would be a fool if I didn't give the same advice, have an expert do the job for you. But after reading this you might at least understand what is going on and be able to judge for yourself if you think you know enough to calibrate your own compass.
Read More


7-Day Tide and Current Forecast

Improved 2/27/2013 - Graph now goes midnight to midnight. Added title to each section.

Tables and graphs for selected tide or current station for the week ahead.
Table shows high and low times for tide, slack and peak for current. Also shows sun and moon events. Graph is as shown below. The final table shows the hourly values.

Sorry tide depth graphs only, please select another station.
Read More


Low Friction Rings Mechanical Advantage

Using Low Friction Rings instead of Blocks
I recently saw a picture of a three stage cascaded block system using low friction ring instead of blocks. This article analyzes such a cascade and shows how to calculate its effective mechanical advantage. The techniques shown can easily be extended to other systems. I will discuss one such system that I use on my boat.

Mechanical Advantage
To analyze a system like this you need to know the efficiency of a single stage, extend that to the the efficiency of the entire system, and translate that to mechanical advantage. For reference lets consider the following sketch.

Read More


Make Your Own Telltails

By: Ed Sinofsky

I admit it, this is sailing nerdiness at its extreme. When I was a teenager I was a sailmaker at Spencer sails in Huntington New York. That was almost 40 years ago! I used to make the telltales when I worked there. It was always fun bringing pockets full out to customer's boats and giving them away like bringing cake or wine to a visit.

I'm no longer a sailmaker, but over the years I have fine-tuned the design. As winter sets in, I always like to make a nice big batch just to keep myself occupied. I thought some of you might be interested to see how I do it.
Read More


2013 Racing Rules of Sailing -- When Boats Meet

With a new year comes new rules. Nothing major changed this year, just clarifications and a few changes to keep people from "working the rules". If you sailed to the intent of the old rules, nothing changes. Here is a link to just the definitions and section 2, When Boats Meet. This is the part every racer needs to know and the source of most discussion of the rules.

Read More


GPX and CSV Waypoint Editor and File Converter

  • Input GPX or CSV Files
  • Add any number of additional waypoints
  • Edit any name, location, or symbol
  • View location of waypoints on map
  • Download as either GPX or CSV The file at the left is an example of the map view of a file about to be edited.

    This tool can be used to convert any Garmin gpx file to a StartLine csv file. In addition, you can use this to read your gpx files into Excel or Word processor for analysis, viewing, or editing.
    GPX -> EDIT -> CSV
    GPX -> EDIT -> GPX
    CSV -> EDIT -> CSV
    CSV -> EDIT -> GPX

  • Read More


    Buying New Sails?

    by Harry Pattison

    New sails represent one of the biggest investments you make in your boat. So when getting ready to make that purchase what things should you consider to make sure you get the product that best fits your needs and to insure you spend your money wisely?

    First make an honest assessment of what kind of sailing you will be doing. Broadly sailing falls into four categories; offshore cruising, local cruising and recreational sailing, cruise/race, and racing. The type of sail material, type of construction, and the price to some extent will be determined by this decision.

    Read More


    Stray Current Can Drop your Mast

    You would think that having researched and witting an article on galvanic corsion that I would know better. But when I installed my antenna on the pulpit thus grounding it, I was only thinking about the VSWR and antenna performance. Little did I know I was going to cause a failure that not only could have but probably should have taken my rig down.

    The coorsion was caused by a 20mA current that was sourced by the potential difference between my newly cleaned (after inspection) bronze chainplate and the zinc on my prop shaft. The path was the bolts holding in my chainplates to the chainplate to the shroud to the bronze ring around my lifeline to the lifeline to the stern pulpit to the antenna ground to boat ground and finally to the zinc on the prop shaft. The connection between the shround and the lifeline was the same as it had been for 50 years but I guess this time it make electrical connection or perhaps it was the different type of twine I used to lash it. That could have held water where the old twine didn't. In any event, in just a few months (May to September) this damage occurred. It is truly amazing that during the race we did the day before ...

    Read More


    Article Index

    Boating Related

    L-36 Articles

    Wood Boat Articles

    Reference Index

    Screws and bolts

    Taps, Threads, and Drills



    Engines and Manuals

    Line and rigging




    L-36 Specific

    More Articles

    First  page 2  page 3  page 4  page 5  page 6 Last


    Ad by Google

    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 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 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.