If it had a mast, would it have made it?

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My simple understanding is that if this Mobo had a mast, it would have acted as a compression post and prevented the tears?

 
That is the most stupid and irresponsible boat lift I have seen in years!!!! There is absolutely no way that any boat would have survived a lift with that lack of support.
 
To answer your question .... however in jest it might have been made ...... no. The damage proceeded from the crushing of the side of the boat due to the strap not being supported by a structural bulkhead. Even if it had be so supported, the fore and aft distribution of the lifting hoist is ridiculous! Four or more straps would have been required .... and controlled.
 
TradewindSailor said:
the fore and aft distribution of the lifting hoist is ridiculous! Four or more straps would have been required
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Really? Who lifts boats with four straps? All the travelifts round here only have two, and I've never seen a traditional crane using any more than two. If a boat's not strong enough to be lifted by two straps, it's not strong enough to survive the sea - the wreck in this video would have surely broken up if driven over a moderate chop at any speed.

As for the fore-and-aft location, this looks about normal for a motorboat, just like the one I saw being lifted out earlier this week. Remember, they have literally tons of engine in the stern, no ballast, and light bows to encourage planing. The centre of gravity is right aft, and the strops go either side of it. It may look a little odd, but only if you imagine the boat to be like a plastic or wooden toy of uniform density.

Pete
 
A more interesting question, would the insurance company pay out? The boat might have been a scrapper, it's hard to tell
 
She's very bow down, and the bow down attitude increases as she's lifted. I wonder if she's full of water? As others have pointed out, the strops aren't badly placed for a "normal" weight distribution in a MoBo, so perhaps the problem is that she had water in her, which ran forward and caused stresses that led to her breaking.
 
AntarcticPilot said:
She's very bow down, and the bow down attitude increases as she's lifted. I wonder if she's full of water? As others have pointed out, the strops aren't badly placed for a "normal" weight distribution in a MoBo, so perhaps the problem is that she had water in her, which ran forward and caused stresses that led to her breaking.
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I think you may very well be right. The whole thing just didn't quite look "right" to my eye (you know how you can usually spot CGI stuff in a film even though it looks totally realistic and you can't say why) and a load of water moving around inside would explain it.

Looking at the beard on the hull I think it's been sitting unused for some time.

Pete
 
The spreader bar is too short, the strops should be angled out from the hull as motorboats don't have structural bulkheads in the same way that sailing boats do in order to cope with inward compression from chain plates and standing rigging. Consequently the strops are angled inwards and have compressed the sides of the hull which has then fractured. The webbing also doesn't go far enough up the hull and the cables have then cut through the weakened hull like cheese wire.
 
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A properly built hull should have taken the loads unless as said she was full of water.It appears this was a weakened structure.The wire pressure against the hull sides didn't help .Why didn't they lower the boat back into the water at the first groanings from the hull?
 
Travel lifts can be set up with multiple strap. It just depends on the length and weight of the vessel being lifted. A common solution would be three straps located on a spreader bar ...... one set forward, one set aft.

NO this arrange is definitely not typical of any lift I have seen.

The strops destroyed the side of the boat and the strength deck by crushing. The hull then had no strength to support the huge overhang of the bow.
 
TradewindSailor said:
Travel lifts can be set up with multiple strap. .....
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The travel hoist at Largs Yacht Haven can't. It has 4 blocks one at each corner which the pair of straps are attached to. The block lines run to their own winch. All 4 blocks can move fore and aft so that straps can be position as required. It's rated to 70t and lifts some big motor boats in and out. I believe you are thinking of the hoists with the parallel poles that the straps are attached to, indeed you could add more straps and in fact usually there are a couple of sets of straps of different lengths stored on these poles which saves having to unhook the hoist wire to change straps. However, it's my experience that only 2 sets are used.
 
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