Angels

Mark-1 said:
Who knows if it's true but Chatgpt says:

Yes, during the Victorian era, naval personnel had practical methods to estimate the breaking strain of ropes based on their dimensions. A commonly used rule of thumb was to take half the circumference of the rope, square that value, and the result would approximate the breaking strain in tons. For example, a 6-inch circumference rope would have an estimated breaking strain of (6/2)² = 9 tons. This method provided a straightforward way to assess rope strength relative to its size.
Click to expand...
I’m finding that formula hard to believe. That 6” circumference rope has a diameter of about 2 3 /4 ins, say 70mm. Not sure I’d want to hang 9 tons off a hemp rope that size.
 
Chiara’s slave said:
I’m finding that formula hard to believe. That 6” circumference rope has a diameter of about 2 3 /4 ins, say 70mm. Not sure I’d want to hang 9 tons off a hemp rope that size.
Click to expand...

Well obviously not becaise you know it's going to break, that's the breaking strain.

I tried chatgpt a second time and asked for a link and it hilariously gave a link to its own post in this thread. 😁

Google located this:

Calculating Breaking Strength, Safe Work Load and Weight of Hawserlaid Ropes

So I guess the LLM might have been looking at something like that and muddled the formula up.
 
Going back to Angels, a device used to be marketed, called a "Chum". It was designed to be slid down the chain, and it had a stalk facing down onto which a selected number of weights were attached.
 
Mine is approx 25lbs, an old weight from industrial scales. On tge loop at the top I spliced a loop covered in plastic pipe with a carabiner on tge other end, clip around chain and runs smoothly.
Very useful in anchorages with a large tidal range to reduce swinging room and keep chain vertical from the bow.
Like Sumara used on shoreline with a large tidal range to keep boat near the ladder.
 
Roberto said:
If you do not plan to pass it as heritage for the next few centuries, a couple of quid solution: add a piece of webbing around it and a shackle to attach the weight and it should last quite a number of anchorages before replacement :)

View attachment 189202
Click to expand...

Careful! Might have to move this thread into the the Practical Boat Owner section.

Nice idea though. Might try that.
 
I use chain and octoplait rode. This is prone to getting wrapped around the fin keel at change of tide.
I use a kettlebell gym weight attached with a rolling hitch and lower it a few metres below the waterline to keep the rope clear. It's been fine so far and the plastic coating has lasted several years without letting rust start. Cheap and simple.
 
Mark-1 said:
I tried chatgpt a second time and asked for a link and it hilariously gave a link to its own post in this thread. 😁
Click to expand...
Chat GPT is just a mechanical motormouth that knows nothing, makes up something that sounds sort of right, and states it with such unshakeable confidence that you automatically believe it right up until the inevitable embarrassment.

Most of us will have sailed with similar.
 
You must log in or register to reply here.

Share this page

Top