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Old 29-12-2012, 15:52   #1
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Using L440 boom as crane?

Has anyone had experience with using an extension to the boom to lift something on and off a platform above the davits at the stern of a Lagoon 440? I have an object that will weigh in the order of 220kg but will need to be swung out to either the Port or Starboard side to be lowered in to the water. It only needs to be raised about 300mm to clear it's cradle, and slewing the boom may require disconnecting the traveller briefly to get sufficient slew. I'm sure it will be well within load limits for the boom, but interested if any one has done the same.
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Old 29-12-2012, 16:08   #2
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Re: Using L440 boom as crane?

Different application, but I've lifted a LOT of diesels out of monos with the boom!
Any fool with a big enough checkbook can BUY a boat; it takes a SPECIAL type of fool to build his own! -Capngeo
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Old 29-12-2012, 19:07   #3
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Re: Using L440 boom as crane?

I lifted my engine out with the boom, no problem and it was an 800 pounder. You must engineer your rig so that the only load on the boom is compression, pushing it towards the mast, so run a couple of halyards out to the point that you intend to load up and secure them there. If you support one spot and load another you'll bend or break your boom.
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