All things being equal when tying to a piling which method provides the strongest lateral breaking strength:
Method A - line around piling and back to boat cleat (variation double wrap around piling), or
Method B - line through eye and back to boat cleat.
Attached is a crude drawing showing both methods.
If I remember correctly from my high school physics class Method A spreads the load along the back radius of the circle while Method B has the force concentrated at the eye. Is my thinking correct?
Right, a rope on a piling is NOT a pulley. And a fishing line hanging over something isnt either. There must be somebody out there that could perfprm my experiment.
Im not sure thats right. On the opposite side of the piling there is only one piece of rope, that takes all the strengh. It would be easy to do an experiment on this , with say a fishing line that we know the breaking strengh of. Im on holiday so cant do it here. Lets say its a 20lb line, we wrap it over a pipe in the ceiling, mimiking the piling. Do you think we could put a 40 lb weight on it, on the bottom?
I think you are correct. If I am a bit short on line to return to the boat, I use a clove hitch on the piling as the strongest way to moor with a single part.
Obviously you didn't read the link or chart I provided.
A few minutes of maritime work may pretty much explain why your theory is not totally incorrect, but mostly incorrect.
Yes, the line could support 40 lbs that way.
In your thought experiment you can substitute scales for the straight
sections of line and they will read 20 lbs each if evenly balanced.
In the real world the line load is spread out along the half circle of the pipe due to friction.
Sure a 40 lb weight on ONE section of 20 pound test line will break it.....of course.
But I don't believe that was the original question..
Picture on the left doesn't really alter breaking strength, it just divides the load in half possibly. While the picture on the right has specific points that reduce the breaking strength of the line in all likelihood.
So the turn around the piling is loosely defined as the stronger connection as I see it.
8 used modifiers as there might be some situations that are not so cut and dry.
Re the original, I chose A too.
Post #23?
I mean the 0P, #1. I reject 23 after thinking more. Anyway, you dont see anybody using A or B, except for tiny boats.
I have been using A on my 40 trawler for years and many transient/permanent docking situations. Great for solo getaways.
Only took a full turn on the pilings for hurricane season.
Have seen more than a few cruisers out East that do the same.
Check Freedom's starboard stern line.
I think you are correct. If I am a bit short on line to return to the boat, I use a clove hitch on the piling as the strongest way to moor with a single part.
Not the same as A in the OP.
And equally strong is two round turns and a two half hitch.
Go round the pole twice as in a clove hitch, but then just finish off with a two half hitch.
That and a clove hitch rate identical.
That is also my preferred method for a stern tie to shore when anchored and not wanting to swing.I have been using A on my 40 trawler for years and many transient/permanent docking situations. Great for solo getaways.
Only took a full turn on the pilings for hurricane season.
Have seen more than a few cruisers out East that do the same.
Check Freedom's starboard stern line.
It is EXAXTLY the same as I can see and as described.
What are you seeing differently?
The stern line is the black line in the picture.
In A, I see one line just going around the back of the piling. On your boat I see a white line and some sort of knot or mess at the piling, plus a black line, which you admit to.
The black line is my stern line. It is Exactly what A describes and is EASILY seen as the STERN line in that picture.
If not, I will assumed you thought I am a liar as I said I use the method shown in A. Or too stupid to understand it.
Those mess of white lines are leftovers from previously unskilled boaters that took me forever to undo as they ran from the piling to the finger pier.
Ok not the white mess, just the black line.
So my boat is a tiny boat or other than tiny boats may use that method? And I have seen other cruisers using the same method when traveling...so don't think me a liar on this one....either.....
Referring to post #44.
PS same poster gave me agita not accepting form stability was not the only contribution to stability and has no beneficial contribution once you reach 90 degrees of incline. Boats he referenced could be expected to have machinery and other heavy weights as well as fluids below waterline so contributing to righting arm. Yet he focused on beam to the exclusion of other important factors. Same hyper focus here IMO so suggest move on with this otherwise informative thread.
In Method A, it seems like there are two ropies attached to the piling. But at the back of it, where the force is concentrated, there is only one rope taking the force. So I dont think its any stronger..
We have all seen everything out there.