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  sling for a 17 foot montauk, dimensions needed please.

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Author Topic:   sling for a 17 foot montauk, dimensions needed please.
ponzuboy posted 01-27-2003 07:43 PM ET (US)   Profile for ponzuboy   Send Email to ponzuboy  
I need some specific dimensions on a 3 point sling for my 17 foot montauk. I want to be able to launch off a pier. Thanks
triblet posted 01-27-2003 08:41 PM ET (US)     Profile for triblet  Send Email to triblet     
Go to the archives. I measured mine and
posted it here.

Chuck

jimh posted 01-31-2003 11:42 AM ET (US)     Profile for jimh  Send Email to jimh     
A good thread on this is

http://continuouswave.com/ubb/Forum3/HTML/000645.html

Jerry Townsend posted 01-31-2003 02:07 PM ET (US)     Profile for Jerry Townsend  Send Email to Jerry Townsend     
The subject of three point slings has come up previously as mentioned above - and will come up again. In an effort to provide some generic guidance on three point slings, I offer the following.

As I have mentioned previously, do not use rope as the stretch of the rope sling can upset the balance and result in dropping the boat. Instead, use vinyl coated cables (1/4 - 5/16 and perhaps 3/8 for the heavier boats) with cable guides (to prevent sharp bends in the cables) and double clamp each cable end. The cable slings will cost a little more, but will do the job much more safely.

The boat will be horizontal if the c/g (center of gravity) is directly under the common lift ring. However, we generally do not know the location of the c/g. Because of this uncertainity, we need to provide some means of adjusting the length of at least one of the sling cables - and a good way to provide the adjustment is to use a length of chain with a couple of clevises. Because of the unknown c/g, I assume the c/g to be located forward of the transom by one third of the boat length.

There is also a need to provide clearance for the console and for this calculation, I assume the common lift ring is located above the level of the lift points by one third of the boat length.

With these assumptions, each of the two aft cables should be:
Sqrt(2) x BoatLength / 3

long, and the bow cable should be:
Sqrt(5) x BoatLength / 3

long. The Sqrt above is the square root.

To provide adjustment in the bow cable, I suggest making the cable 80 % of the above length and provide a chain about 40% of the above length.

As an example and considering a 17 foot boat, each of the aft cables should be:
Sqrt(2) x 17 / 3
or about 8 feet long. The total 'expected' length of the bow cable would be:
Sqrt(5) x 17 / 3
or about 12.7 feet (12 feet 8 inches) long. As suggested above, the cable should be 80% of the above bow length or 10.1 feet (10 feet 1 inch) and the chain be 40 % of the above bow length or about 5 feet long.

Hopefully this will help. ---- Jerry/Idaho

seasicknes posted 02-05-2003 01:35 AM ET (US)     Profile for seasicknes    
I launch my montauk out of Pt Arena for abalone/rockcod/salmon/crab. They use a hoist. Owner of the boats must provide there own slings.

My lengths are: (1-front at 10 feet) (2- rear at 8 feet).

You can order the slings at McMaster-Carr.
Its a 2" wide strap, nylon and its 2 ply- rated heavy duty. Vertical lift weight capacity is 6,200 each sling. No problem in lifting a montauk.
Part number is 3383T431 and tell them that you want ONE at 10 feet and TWO at 8 feet.
Telephone number is (california-562-692-5911)

You can purchase the shackle there too or you can buy it at west marine or orchid supply hardware.

Ken (17 montauk)

seasicknes posted 02-05-2003 01:45 AM ET (US)     Profile for seasicknes    
Oh I forgot to mention. You got to tell them if you want a FLAT EYE AND EYE or TWISTED EYE AND EYE.
Only difference is that the twisted is easier to put onto the hook.
The flat eye to eye is easier to store.

Ken (17 montauk)

triblet posted 02-05-2003 08:45 AM ET (US)     Profile for triblet  Send Email to triblet     
http://www.mcmaster.com/


Chuck

ponzuboy posted 02-15-2003 07:41 PM ET (US)     Profile for ponzuboy  Send Email to ponzuboy     
thanks for all your help i ordered the sling from mcmaster carr at two 8's and one 10. boston whalers are the best!

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