Spring Line

weinie

.
Sep 6, 2010
1,297
Jeanneau 349 port washington, ny
Stu,
If my chain plates can't handle a couple hundred pounds tops for a few seconds that just happens to be in the lateral direction, my rigging has big problems!
 
Feb 20, 2011
8,062
Island Packet 35 Tucson, AZ/San Carlos, MX
I think Stu's right. Like he said, "think about it". Sure, they should be able to handle brief, but light lateral stresses.
 
Sep 15, 2009
6,244
S2 9.2a Fairhope Al
the chine plates are designed like a ladder the strength is in the up and down direction...if you think they will work laterally then climb the ladder half way up and then try to go to the back side of the ladder by swinging around the left or right side to be on the back side of the ladder the ladder will move to your weight and more than likely fall over ......

regards

woody
 
Feb 20, 2011
8,062
Island Packet 35 Tucson, AZ/San Carlos, MX
Let's get 'ol Tkanzler (or another mech engineer) in here to provide a force vector analysis.

For free, of course. :D
 
Jul 8, 2011
704
Catalina 30 Sidney B.C.
Stu
Do you mean running the dock line through the cleat on the deck or on the dock
Why not take your lines with you
Sorry to ask but can't learn without asking
 
Feb 20, 2011
8,062
Island Packet 35 Tucson, AZ/San Carlos, MX
It's rare that I suffer from information overload, thank goodness, I think...
 
Feb 26, 2004
23,137
Catalina 34 224 Maple Bay, BC, Canada
Stu
Do you mean running the dock line through the cleat on the deck or on the dock
Why not take your lines with you
Sorry to ask but can't learn without asking
Oh, no, more engineers - I are one! :eek:

Answer: your boat. Loop 'em through the dock cleats if you must, but I use the simple double hitch on the docks. Our bow lines have thimbles and shackles. Your boat, your choice.

Because when you come back to YOUR dock, you simply use your BOAT HOOK and grab the lines and lightly place them upon your BOAT's cleats.

You stay ON your boat.

You NEVER have to JUMP DOWN ONTO THE DOCK. And "run around...grabbing lines and pushing stanchions, which, BTW, are a BEAR to re-seal and keep watertight. That's why Maine Sail invented his butyl tape! :naughty:

Why make it HARDER to dock at YOUR dock.

Learn midships spring lines - unless you missed the last lines in my earlier links. :confused:

Sorry for the shouting...:doh::D
 

weinie

.
Sep 6, 2010
1,297
Jeanneau 349 port washington, ny
Well, I didn't analyze it from an engineering standpoint, but I figure I can pull about 200 lbs max at the gym.
If I was standing on the dock and pulling with all my might at the base of my shrouds to pull my boat into the dock, I really don't think my chain plates are gonna pop out.
BTW, the idea came from Jack Klang's docking video.
 

weinie

.
Sep 6, 2010
1,297
Jeanneau 349 port washington, ny
As far as hooking lines on the dock...

The problem I had is what do you do when you are single handed, the wind is behind you, your prop walk is moving your stern away from the dock, and you MISS!?

I've found it much easier to throw a wide "lasso" around the aftmost dock cleat.

Furthermore, if you chose Stu's method and grab the stern line that is laying on the dock and loop it onto the stern cleat on your boat, you will find, that if the wind is blowing you off the dock, no matter how much throttle and rudder you give it, you will not get the bow in UNLESS you have a line coming from a more forward position on the boat.

ETA:

I grew up powerboating. I found it very hard to break the "habit" of grabbing the line on the dock. I still leave the lines on the dock, but while docking when the wind is up, I am almost always using Jack Klang's method which is to use a spring line attached to the shroud. When its calm or when the wind is pushing me just right, its a different story.
 

WayneH

.
Jan 22, 2008
1,109
Tartan 37 287 Pensacola, FL
We have "traveling" dock lines on the boat. They are stored in the starboard cockpit locker and we use them whenever we are out cruising. But I think the best reason to leave the home dock lines on the dock is they are set.

We come in, hook the spring line eye laying on the edge of the dock, drop it over the boat cleat and we're done. Our slip is a V shaped slip and Impetuous' butt is a tad too big to fit all the way in. So the spring line that stops her reverse momentum never gets untied from the dock. The spring line and prop walk together put the stern close enough to the dock to grab the stern dock line and we're home.

One of us then steps off the boat and HANDS the other person the two bow lines and the other stern line. No running, no fussing, no cussing. And usually, the wind is against us.
 
Feb 26, 2004
23,137
Catalina 34 224 Maple Bay, BC, Canada
Stu is right.....on all counts.
Doug, thanks.

But that was not necessarily my point --- I was not trying to be "right" but was simply pointing out that there are many ways to do things and many ways to do things incorrectly by applying forces to parts of a boat that were not made for that application. Cleats are for lines, shrouds are not.

I often say "Your boat, your choice," but that's for when there are real options.

I leave my dock lines on the dock, as Wayne noted they are the right length and the boat doesn't hit the dock regardless of wind strength or direction. I do not have to "race around" setting dock lines when I come in. I don't have to get off the boat to connect my four dock lines. That's what boat hooks are for.

I often go places and not anchor out, like for example other marinas. Or a fuel dock. They, of course, don't have dock lines, which is why I use the spring line if there is any wind or current present.

All of this is covered in the links I provided, which I find many folks don't bother to read. :doh: :confused: That's OK, I don't bother to retype that information, either. :dance: I do appreciate those who do spend the time to read them though. :) One of those links commented on docks without cleats, like rings or those PNW high wooden slats. Get a grapnel hook! :D:D:D

It's two things, really: seamanship/boat handling and safety. Why jump off a boat and expose yourself and/or guests to danger? Ever?
 
Oct 17, 2011
2,809
Ericson 29 Southport..
I'm wondering what would be the outcome of a dockline around a chainplate riding up a shroud. I'm in the engineer camp, that sounds like a poor idea.

On another note, I have approached a dock and seeing 'dock hands' eagerly standing by to do something dangerous, you know, the stanchion grabbers and whatnot. Grab about 75 feet of line in a jumble, don't EVEN try and make it look like a loop, and throw the whole mess at them, (that is completely unattached to the boat), and while they flail about in their own panic trying to figure out the gigantic knot; dock the boat yourself.

Which is the way it should be done..