3 point hoist of 7m RIB?

[Bigtalljv]

Hi,

Anybody here have experience with rigging slings and hoisting boats?

I have an old 7.3m ex-military zodiac rib I have been struggling to figure out how to sling launch it. Using the slings under the boat puts stress on the tubes that I cant live with. The harbor patrol here has a zodiac 753 that has four lift points (nice modern flush ones that you can’t kick) that they use on the crane instead of the slings and it’s fantastic. I had been trying to replicate that.

My boat had the four lift points from the military that was designed for the single point sling. That’s not an option due to the local hoist and I had to remove the front two lift points as they were massive toe breakers.

I had been trying to replicate the four point lift but I met a guy this weekend who has the same boat I do (same year but two boat earlier!!!) and he said they lift it with three points, the two stock rear and the loop on the front Samson post. Sounds like a great idea I hadn’t thought of.

I would think the front Samson post can hold half the boats weight? It’s pretty massive, bolted through the floor and against the front. Anybody have any thoughts? Military specs were hoisting weight of 3300lbs. I’m probably pretty close.

Thanks
Jason

[charliee]

You’ll find out when you try it!

[simonl]

Originally Posted by Bigtalljv

Hi,


I would think the front Samson post can hold half the boats weight?

Attachment 126247Attachment 126248

I would expect it to be well under half the weight, assuming you have an outboard fitted. I'd try to lift from low on the post preferably.

[Bigtalljv]

Thanks, yes an outboard so good point. It’s a bad picture but down where my finger is pointing there is an eye. It’s a huge stainless barrel mounted sideways through 1/4” stainless plate that is welded between the base and the post. That would be my lifting point.

[ncp]

Three points.... Wouldn't it be holding closer to 1/3 of the weight?

[simonl]

Originally Posted by ncp

Three points.... Wouldn't it be holding closer to 1/3 of the weight?

increasing the number of points at the back doesn't decrease the load at the front!

[Andre]

3 way lifting points are standard on all our ribs . our samson post is very similar to the one on your Zodiac rib and for sure like us they have not only bolted it to the deck but also laminated it to the hull at the base of the anchor locker. We also link the bow eye to the samson post to give it extra strength

the rib in the photo is a 9 mtr and total dry weight approx 2600kg

your rib is 7.5 mtr so a bit lighter and since Zodiac at factory stage installed the samson post with the lifting eye at the base it must be more then suitable for a 3 point lift. Ask fellow member Zodiac Hurricane and it is my guess he will agree.

[simonl]

Make sure you go *around* the post as well as going through the eye

[Andre]

Originally Posted by simonl

Make sure you go *around* the post as well as going through the eye

Ours does not need that. Just hooking up to the eye is enough

[simonl]

Originally Posted by Andre

Ours does not need that. Just hooking up to the eye is enough

As in it's been tested & certified for use by the builder, or you use it that way & it hasn't failed? It just seems good practice to me

[sunrider]

if you need a sling I have a couple I intend to sell that came with willards or zodiacs i reconditioned over the years - can't recall which models but if you give me desired dimensions of each arm I could see if one of mine would work....

[gtflash]

As Andre says. Most after market bow lifting eyes link to the bow eye via a big lump of metal. Very popular in the states. Buy one or copy the idea.