Line Stretch Comparison
Leave the force blank to display the line breaking strength for the lines and sizes listed as well as the published stretch at 10%, 20%, and 30% of breaking strength. Enter a force and the stretch at that force, using interpolated stretch values, will be displayed in percent. Enter line length in feet and the table will be line stretch in inches. You can enter the load force directly (leaving winch power blank) or put the effort on the winch handle (probably around 20 to 35 pounds) and the winch power ratio to let the program calculate the total force. The power ratio is the gear ratio times the ratio of the handle length to drum radius. Enter a safety factor (5 is typical) and all entries that exceed that safety factor will be in red. The line lenght with a winch is the length from the winch to the clew for example. For a multi-part system, it is the length between the blocks, not the total lenght of the line running through the blocks. The Jib Wind Load Calculator may be useful in estimating load numbers.
If your favorite line is not shown, contact me in the Forum and I will add it if strength and stretch data is published.
NOTE: Strength and Stretch data is from manufacturers data sheet. Some of these numbers are suspect so please double check anything presented here as there may be errors. It was recently pointed out that the data showing VPC has more stretch than StaSet is certainly not correct but that is what the data sheets show. .
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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 numerous 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.