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Old 29 July 2003, 10:08   #11
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Best to fit in the bow area the folding lifting eyes made by WICHER . In the UK these are supplied by PROBOAT
Of course it is much easlier when this is done during the manufacturing of the rib as the fitting goes through the hull as shown on the photo posted by JK. This is what I hv on my rib and must say as they fold down you don't trip over them

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Old 29 July 2003, 11:24   #12
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Could you not just let the sponsons down so all the pressure is on the hull?
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Old 29 July 2003, 12:05   #13
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The yard did suggest letting the sponsors down, but as the boat will be in and out each weekend during the season this would probably be too much hassle.

After all the excellent feedback I've had, especially the picture of the scorpion being squeezed, I've decided to have lifting eyes put in by the dealer who reckons it's quite straightforward.

Tim
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Old 29 July 2003, 12:59   #14
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Strange as it may seem, deflating the tubes for a crane lift is definitely not the correct procedure. Keep 'em hard.

If you deflate the tubes, it allows the tube to deform too much and places too much load on the joint of the hull to the underside of the tube, cracking the layers which are glued together. I was told that Mark Pascoe used to have some problems from doing this, hence the recommendation from his crane driver to keep 'em pumped up.

I've had four crane lifts with Blue Ice now (using a spreader frame), and the process looks much worse than it is! I've examined the tubes very closely afterwards, and I'm pleased to say that there's not a single mark. (It would be interesting to hear from the tube guys about this - have they seen any nasty damage from lifting?). In fact the worst marks on the tube are from using an over-the-top webbing strap on the trailer.

Having said that, I'll be giving some consideration to getting lifting points fitted during the winter. Two on the inside of the transom (as that's where most of the weight is and these are the easy ones to fit - I could do that bit myself) and then either two up front (but don't relish the thought of going through the hull) or a single point in the anchor locker (possibly on the back of the towing eye?) I'm not keen on using a reinforced deck point as the deck was originally designed for a downwards load! A consultation with Mr Jelley in order her.

The photo of Charles' RIB is unusual as being a cabin RIB, there's a significant load on the forward lifting strops which isn't the case with a conventional open RIB. When Blue Ice is lifted, her tubes at the front are hardly touched.

Tim - which yard are you using? do you want to answer by PM? Doesn't sound like they are used to handling RIBs!?! (although I suspect you may have received some confused information here).
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Old 29 July 2003, 19:27   #15
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spreader, yes

Having had experience lifting my alum riverboat, sure; get a spreader. The force inward is ENORMOUS when you lift anything with with a strap hooked at two places. For that same reason, you do not yank a truck out of the muck wi th a chain tied to each towing hook, as you can pull your frame rails together a tad. I built my spreader out of 2" pipe with a "U" welded on the ends to catch the strap. Pipe is great in compression; you may need larger pipe. PS: Two hooking points in the stern deck are the same phenomenon; make sure your deck can take the compression and keep the lifting strap long. Best to you. John
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Old 30 July 2003, 05:34   #16
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The yard is Sparkes Marina at Hayling Island. They are an excellent yard with great service.

As the service I have is on the basis she is lifted in and out most weekends, they have costed this on a quick lift basis. To use spreaders each time makes things much longer for them. However, until I get the eyes fitted they are happy to do this to protect the tubes.

On consultation with the manufacturer, I am going to get 2 eyes bolted to the transom, and one in the anchor locker which means not having to mess about with the deck.

I'm very pleased to have got a better understanding of the lifting issues and the method of fitting eyes from this thread and thank everyone for their input.

Tim
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Old 30 July 2003, 08:20   #17
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as a tube builder best way to lift is with lifting eyes the simplest being two on transom and one in the bows preferably through hull not deck ie in bow locker . second best is with hard tubes and spreader bars and thirdly with hard tubes definitely NOT with deflated tubes as this will cause most damage
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Old 30 July 2003, 14:40   #18
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Tim and Ian Anderson (who are running the Ken Brown Boat Park in the Camber Dock now) have built a spreader frame which seems to spread most of the load and is the best way of craning I have seen yet. I certainly woudln't want to crane a RIB without one, or lifting eyes.
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Old 30 July 2003, 16:15   #19
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lifting crane spreader

Wow! That is a kick-buttinski setup for lifting a boat. Looks as if those guys know what they are doing. Great job, gents. I guess the operative word is "brill" ?????
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Old 30 July 2003, 16:33   #20
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Alternatively, you could always goto a marina/boatyard with a Wise boat hoist, which avoids the need for spreaders

When I lifted my old rib off its trailer last year, to avoid strain on the tubes, cos it didn't look too good, I opened the hoist as wide as it would go before lifting. It ended up putting most of the pressure on the hull, and the tubes 'just' touched the strops enough to prevent the boat from rocking.

It did look well odd, and I'd suggest that if you do that on a slipway hoist, it might also be worth attaching ropes from the strops to something inside the boat, perhaps to the a-frame just to stop it slipping back.

-Alex
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