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- Ship crane
April 29, 2010, 2:52 pm
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Re: Ship crane
Extra points for it being steam-powered? ;-)
What sort of reach does it need to have? I'd imagine quite a bit, and
that will probably impact things a lot - the boom will need to be
substantial, which means quite a big truck, significant stabilisers etc.
What about drop - does the transport truck always sit on dry land with
only a foot or two to the water, or are you sometimes dropping things
many feet over the side of a dock / pier etc.? (If the drop's always
quite small, I was just thinknig that something with a hydraulic lift,
but not necessarily a crane, might do the job instead)
Do you expect to take the crane with you on the transport truck, or does
it need to be self-propelled? If the latter, what sort of distances does
it need to travel?
Interesting problem, anyway...
Re: Ship crane
Would the boat be lifted from above using flat web straps,
or with it sat on a cradle?
If you use straps transversely under the keel you will need to use a
spreader beam across each to prevent the weight of the boat crushing
the gunwales inwards, and probably two to keep them from sliding
together longitudinally. Unfortunately, all this adds weight and
height when they all meet at the apex.
What are the boats dimensions?
Would they fit on a “Roll-on – Roll-off=94 demountable plant flatbed?.
In a previous working life during the early the eighties I was
seconded to drive the company 15 ton RT mobile crane, and their 22 ton
Rusting Buggybus rigged as a crane, when required. I launched two
boats of a similar weight lifted from trailers, and one vice versa
(*), using a spreader frame.
(*) Sorry, I can=92t think of a single word for the opposite of
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