SailNet Community - View Single Post - Forces on a dockline while docking....
View Single Post
post #28 of Old 04-29-2013
pdqaltair
Senior Member
 
pdqaltair's Avatar
 
Join Date: Nov 2008
Location: Deale, MD
Posts: 2,567
Thanks: 1
Thanked 51 Times in 51 Posts
Rep Power: 7
 
Re: Forces on a dockline while docking....

I based my original post on drop testing and other dynamic tests of rope energy absorption. It will vary from one line to the other. However, This is a case where energy absorption is what matters, not strength, and the test methods are different. Unfortunately, energy absorption capacity drops off with use faster than strength (ropes stiffen), making the calculation more complex and in the end, empirical.

The other important factor that some understand but a few have missed (those reasoning everything will break) is the length of the line. For example, I'm betting I can stop a 175-pound swimmer with a head start with 15-pound fishing tackle; did it once at the local pool just for laughs. It's all about the math.

-----------

Bottom line: a boat-length of standard dockline (3/4-inch for this size boat) will do nicely.

(when asked how he reached the starting holds on a difficult rock climbing problem that clearly favored taller climbers - he was perhaps 5'5")

"Well, I just climb up to them."

by Joe Brown, English rock climber




To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
pdqaltair is offline  
Quote Share with Facebook
 
 
For the best viewing experience please update your browser to Google Chrome