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Old 04 July 2014, 18:58   #11
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No, they had problems with things like screws (or lag bolts - whatever they used) holding seat bases backing out. Just about any hardware that screwed into the PE had problems.

Not sure what they did to address that problem.

jky
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Old 05 July 2014, 03:43   #12
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RIB with Bow Steps/Ramp - Do they exist?

I can remember that there was a company making these, 15/20 years back they used them as safety boats on the river seine, so the technology is there, they weren't very deep In the V I've had a think about doing something with a flip down front but I cant seem to get my head round deep V hull excepting a dropping bow
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Old 05 July 2014, 05:07   #13
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Ah, so it's a case of choosing your glue with care then?
Virtually no glue sticks to polyethylene. The screws issue requires forward planning at the design stage. They can mould bolt inserts into the hull at manufacture or design so it can through bolted. If you need to screw aftermarket stuff in place then self tappers should be seen as temporary... and regularly checked. You can use cavity wall type fittings that expand behind the material but keeping that watertight becomes more complex.
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Old 05 July 2014, 05:26   #14
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Virtually no glue sticks to polyethylene. The screws issue requires forward planning at the design stage. They can mould bolt inserts into the hull at manufacture or design so it can through bolted. If you need to screw aftermarket stuff in place then self tappers should be seen as temporary... and regularly checked. You can use cavity wall type fittings that expand behind the material but keeping that watertight becomes more complex.
we use a lot of UHMWPE/LDPE (different grades of polythene) at work & it's virtually impossible to glue as it exudes oil over time. All our components are mechanically fixed. We don't even use self tappers or other "screw in" type fixings, everything is nut & bolted with form G washers (big thick ones) There are one or two specialist companies that can weld polythene but I wouldn't trust it for anything structural.
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Old 05 July 2014, 06:41   #15
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See this rib the other day.
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Old 08 July 2014, 10:46   #16
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DELTA made one with a ramp years ago, not sure if its in production still. Saw one a while back with some nice steps that folded out, that might have been the Nautica already mentioned.
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