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Catalina 34

General Activities => Main Message Board => Topic started by: Ken Juul on February 27, 2012, 04:50:57 AM

Poll
Question: What % of Breaking Strength
Option 1: 20%
Option 2: 40%
Option 3: 50%
Option 4: 66%
Title: Question of the week - Rope Strength
Post by: Ken Juul on February 27, 2012, 04:50:57 AM
A normal safe working load for nylon rope is?
Title: Re: Question of the week - Rope Strength
Post by: Ken Juul on March 05, 2012, 04:21:12 AM
This is a hard one to answer. According to the USCG, 20% is the correct answer.  However, most manufacturers say working load is 5-12% of tensile or breaking strength so the USCG answer is a bit generous...but they don't have to worry about getting sued.  Typical 3 strand ½" nylon rope has a tensile strength of 6400 lbs, therefore the max safe working load is: 1280 by USCG, 320-768 by the manufacturer's chart I used.   
Title: Re: Question of the week - Rope Strength
Post by: Ron Hill on March 05, 2012, 02:22:45 PM
Ken : You eluded to it, as there is a real strength difference between 3 strand and braid on braid and single braided lines. 
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