Boat moorings (pulley line)

[crazyjonny]

We just had a nice storm come thru here on eastern LI and my 24' Grady started moving. The 300llb mooring i set myself with 24' of 1/2in chain wouldnt hold her. 5 1/2 feet of water at high tide! Anyways has anyone used a helix (http://store.hamiltonmarine.com/bro...r-10-1.25x5.5-shaft-galv-728235-/4,36140.html) mooring with success? I'm going to try this or the square stock one with 2 rings or screws (http://helixmooring.com/)

btw the bottom is heavy mud at the top http://i1083.photobucket.com/albums/j399/Brozzi3113/DSCF1048_zpsbe7a1083.jpg

 

[DBreskin]

Re: Boat moorings (pulley line)

24' of chain in 5.5' of water is 4.3:1 scope. The short chain means your boat is lifting the mooring.

You'll improve your holding power with a longer chain. I suggest minimum 7:1 scope and 10:1 is even better; that means you need at least 38.5 feet of chain.

 

[crazyjonny]

Re: Boat moorings (pulley line)

I hear that! Longer chain does make sense, I just think since it has moved why not redo the entire mooring with that helix-she only costs $130.00 and can be screwed in by hand while being backed up by the mushroom. If you could have seen the Grady missing the rocks by 2 feet or less you would understand my concern. Moving her at night wasnt anything i'm willing to repeat!
Thanx for your reply
Anyone have experience with helix moorings????

 

[tpenfield]

Re: Boat moorings (pulley line)

Moorings do not use scope the way an anchor does. Maybe some other issues. 300 lb mooring for a 24' boat should be plenty, unless there is an issue with the type of mooring that is being used.

 

[crazyjonny]

Re: Boat moorings (pulley line)

I've been doing alot of reading on moorings and from what i have read 300 llbs isnt big enough since in the water it only weighs like 260 llbs
I do know the heix systems have much more holding power!
(3500 LB BREAK OUT FORCE IN FIRM SAND CLAY MIX COULD BE USED FOR BOATS UP TO 30' IN GOOD SOIL IN WINDS UP TO 60 MPH)
or the square stock double helix mooring is:
Thanks for your interest in our Helix Mooring anchor.

Here are my assumptions:
6" of soft mud over firm mud/clay soils to a penetrable depth of 7'.
Holding requirement of 3,000 lbs for a 24' LOA vessel.

We can provide taller anchors, but it seems you prefer a 6' option. This should be quite satisfactory given the soil assumptions, but i am also offering a 7' option which would better accommodate 1' of soft over firm.

6' tall anchor with 2 helical disks built on a 1.5" Square Shaft and including a 1" SPA shackle: $342.
7' tall anchor with 2 helical disks built on a 1.5" Square Shaft and including a 1" SPA shackle: $3

 

[tpenfield]

Re: Boat moorings (pulley line)

Mooring anchors (Mushroom, Dor-Mor, etc) are most effective in mud, as they sink down and provide more force to move them than their weight alone. If you are mooring in a sandy bottom, then maybe helix is the way to go.

My 24' boat had a 200 lb Dor-Mor mooring anchor . . pretty much the immovable object. I think that I am going to have to upgrade to a 350 lb anchor with the 33 footer.

 

[crazyjonny]

Re: Boat moorings (pulley line)

tpenfield was your 200llb mushroom jetted down to the eye or was it laying on its side like mine was? Just got off the phone with costello Marine--these are my options
1)For $2600.00 he will jet down to the eye a 500llb mushroom
2)For $3500.00 to $4k he will set that square stock 1 1/2" helix mooring in 5 ft of water
3)For $600.00 he will jet down to the eye my existing 300llb mushroom
or i could (by hand) screw in the round stock 1 1/4 single screw helix and cross my fingers
Your 200llb mushroom must have been jetted down or at least really submerged for it to hold a 24ft boat like mine

 

[Home Cookin']

Re: Boat moorings (pulley line)

where does the pulley line come in? I was expecting a question about using a piling/pulley system for mooring.

 

[crazyjonny]

Re: Boat moorings (pulley line)

At the top of the chain where it goes thru the ball is a shackle and ring where the 5/8 line is braided into and its tied off at the stake on the beach. It can either be a conventional mooring swinging with the wind or attached to the line so the boat can be pulled in. Works well when the mooring holds. We have many here on Shelter Island even though 24 ft is a little big for it--seemed to work well though! Look at my photobucket pics

 

[crazyjonny]

Re: Boat moorings (pulley line)

wrong click
http://i1083.photobucket.com/albums/j399/Brozzi3113/DSCF6402_zps1ef04301.jpg

 

[tpenfield]

Re: Boat moorings (pulley line)

That looks like what we call an 'outhaul' . . .

 

[crazyjonny]

Re: Boat moorings (pulley line)

Never heard it called that--i wonder if anyone has ever used it for such a heavy boat there in cape cod?
What about mushroom sizes also and if they are jetted in place? Any ideas?

 

[tpenfield]

Re: Boat moorings (pulley line)

Mostly smaller boats on that type of set up. Usually, they are used where you have a dock and you keep your boat slightly further out in deeper the water due to the tides.

Then when you want to use the boat . . you haul it in to the dock. When you are done, you haul it out.

 

[Home Cookin']

Re: Boat moorings (pulley line)

That looks like what we call an 'outhaul' . . .

an outhaul is a sailing term for the line that pulls the sail out to the end of the boom (IIRC); not the same as a downhaul or boomvang.

but it may a term with two meanings.

 

[tpenfield]

Re: Boat moorings (pulley line)

an outhaul is a sailing term for the line that pulls the sail out to the end of the boom (IIRC); not the same as a downhaul or boomvang.

but it may a term with two meanings.

Yes, a sailing term and a mooring tackle term . . sometimes called a 'clothesline mooring' or an 'outhaul mooring'

http://www.boatingmag.com/skills/seamanship/clothesline-mooring

 

[Home Cookin']

Re: Boat moorings (pulley line)

Yes, a sailing term and a mooring tackle term . . sometimes called a 'clothesline mooring' or an 'outhaul mooring'

http://www.boatingmag.com/skills/seamanship/clothesline-mooring

good to know. Interesting way to moor, too, although I don't think I'd want a line under water and under the boat all the time, but OK for temporary. We use pilings with pulleys a lot around this part of the world in various configs.

 

[crazyjonny]

Re: Boat moorings (pulley line)

Piling and pulley is called a stake and pulley line-outlawed here on Shelter Island---NY land of NO---no u cant!
Thus the need for a mushroom or helix type mooring. Dock space is at a premium here-i just landed a winter slip where the boat is now but come spring its back on that pulley line with a new mooring mushroom or something!
btw i pull the line every winter---just undo the shackle from the chain and keep it clean and dry!