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Old 29 July 2003, 04:12   #1
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Lifting a Rib

Can anyone give any advice regarding lifting a RIB from the water.

I will be keeping my new RIB (7.5m) at a Marina where they lift the boats in and out of the water for use and store them on their trailers on the dock side. There is no slipway.

The method for lifting is a mobile crane with two large webbing straps slung beneath the hull of the boat.

The Marina says this is fine for sportsboats and yachts, but they are relectant to use this method for RIBS as they are concerned about the tubes getting damaged from sideways pressure of the straps, and they want the RIBS to be fitted with lifting eyes on the deck as an alternative point for attaching the straps.

I'm not so keen on getting these lifting eyes fitted, and wondered if anyone has any views as to if RIBS really would suffer from this lifting method, or if it is OK.

Many thanks for any views.
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Old 29 July 2003, 04:25   #2
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Too right Tim - I arrived a minute too late when they craned me in and I was lucky to get away without any damage to the tubes. Just look at the strain on them. Can you not manufacture something that can be removed and placed back when required?
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Old 29 July 2003, 05:15   #3
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Lifting

Tim

Go for lifting eyes in on the transom and the bow. Seen a few Ribs crained in like charles picture above and it puts a huge amount of pressure on the tubes. Make sure the lifting eyes are fitted proffesionaly and check the desk is strong enough to take them.

Julian
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Old 29 July 2003, 05:39   #4
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Re: Lifting

Quote:
Originally posted by Julian
check the desk is strong enough to take them.

Julian
Hey Julian, are you another one of Narked's virtual boaters?
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Old 29 July 2003, 05:46   #5
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Get the liffting eyes fitted. They are not intrusive and can always be used for strapping things down on the deck (mine are)
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Old 29 July 2003, 05:48   #6
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Now I can see what they mean about tubes getting damaged.

I wonder if the use of spreaders on the crane straps could keep the straps away from the tubes.

Regarding the fittment of lifting eyes, would it be 2 at the back and one at the bow, or 4 evenly spaced?

Does anyone know how they should be fitted, i.e. I guess you would need a large reinforcing plate beneath the deck for each eye, and how is it possible to do this without magor surgeory on the deck?
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Old 29 July 2003, 06:33   #7
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I've fitted lifting eyes to a smaller RIB, but it may need a bit more planning on a larger, heavier boat.

For the front pair of lifting points I used a fairly hefty U-bolt right through the hull on each side of the boat, a metre or so back from the bow. They were backed with stainless steel plates about 15cm x 8cm and lots of Sikaflex. At the transom I had a pair of U-bolts like towing eyes but fitted to the inside.

Alan Priddy fitted similar lifting eyes to "Still Never Enough" a 7.4m Ribtec -- see dodgy picture below. As far as I remember a similar system of through bolted plates is used on Still Deep One, Jim and Yvonne's 10m Delta.

Before you start drilling make sure you've worked out the position of the lifting points to get the balance right. You may also want to consult the manufacturer or someone who understands the ins and outs of boat construction.

As a side note, it's also worth having your own set of lifting strops with hooks so that the crane crew only have to hook up to a single point, keeping that dirty great hook away from your console, GPS, plotter etc!

John
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Old 29 July 2003, 08:16   #8
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Quote:
Originally posted by timw
I wonder if the use of spreaders on the crane straps could keep the straps away from the tubes.

Spreaders is the preffered option if you do not want to go drilling into the deck, hull etc. You need to discuss this option with the crane operator.
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Old 29 July 2003, 08:17   #9
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Thanks for the very useful info.

There's no way I'm going anywhere near my new boat with a drill...I shall ask the dealer to do it.

Tim
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Old 29 July 2003, 10:06   #10
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Hi timw

Take a look here you will see Cyanide being lifted out of the water. As far as I am aware there are lifting points fitted. Over to you Brian...

Keith (just two weeks to go...) Hart
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