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Old 28 November 2010, 08:23   #21
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Here's details of Rayglass's Protector RIB (jetski propulsion).
http://www.rayglass.co.nz/admin/docu...csheet2010.pdf
Thanks Sparticus. I've already contacted the factory in NZ about this boat and have received a quote inc. shipping. It's pretty cool and would do the job for certain.
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Old 28 November 2010, 12:28   #22
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Thanks Sparticus. I've already contacted the factory in NZ about this boat and have received a quote inc. shipping. It's pretty cool and would do the job for certain.
No problem. It was featured in Sports Boat and RIB back in the spring if I remember.
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Old 28 November 2010, 16:31   #23
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Naval Architect

Apart from the obvious affect on performance of having 500Kg of deck cargo equivalent to about 6 Adults weighing 80Kg.

The stability issues / calculations relevant to height of crane / reach can be easily calculated by a naval architect may even be available from any manufacturer.

It is possible to do a test if you have access to the boats you are looking at by basically adding 50 Kg on the centreline of the boat then offsetting this by 1000mm and measuring the change in angle. The subsequent calculations to achieve the above are fairly simple

There is a very nice Tornado for sale at a good price in Jersey, you would get a Jetski / bike in the stern with space to spare. The boat was tested with 12 adults plus 200kg of lead on the bow then extremity of the stern as part of the certification.
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Old 29 November 2010, 07:00   #24
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Crane on Rib

Redbay built a rib with a hiab on it, I think it was a survey boat for some government agency, but could be wrong, I've been wrong before.

It saw it while I was over with my old boat a few years ago, the survey boat was in for a refit, so know for sure its been done!

Regards,
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Old 29 November 2010, 15:32   #25
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Apart from the obvious affect on performance of having 500Kg of deck cargo equivalent to about 6 Adults weighing 80Kg.

The stability issues / calculations relevant to height of crane / reach can be easily calculated by a naval architect may even be available from any manufacturer.

It is possible to do a test if you have access to the boats you are looking at by basically adding 50 Kg on the centreline of the boat then offsetting this by 1000mm and measuring the change in angle. The subsequent calculations to achieve the above are fairly simple

There is a very nice Tornado for sale at a good price in Jersey, you would get a Jetski / bike in the stern with space to spare. The boat was tested with 12 adults plus 200kg of lead on the bow then extremity of the stern as part of the certification.

Yes, "Too Grumpy" is a fly craft; Matt was after the Verados at one point I think. I never thought about a retro fit out; it's a good idea. By the way Matt, did you get my email about Coppercoat antifoul?
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Old 29 November 2010, 16:01   #26
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Yes, "Too Grumpy" is a fly craft; Matt was after the Verados at one point I think. I never thought about a retro fit out; it's a good idea. By the way Matt, did you get my email about Coppercoat antifoul?
Yes sorry forgot to thank you for that, looks like the way to go.

I still think there's ways round your theoretical problem without using a crane with the right rib, going back to the Ocean Dynamics jet drive boats that had an open transom, that would allow you a shallower ramp. Another thought is using a see-saw arrangement on the ramp, once the jetski starts hanging over the back, the ramp could tip the jetski off in to the water. Just kind of thinking out loud!
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Old 30 November 2010, 07:40   #27
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Wouldn't a crane require some balasting in the hull? There's a home page pic of a US CG rib being deployed out the back of t'muther ship could a smaller scale version of that work? If it's over the back of a jet drive it might still have a high C of G so could be a pig to handle.
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Old 30 November 2010, 13:18   #28
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Wouldn't a crane require some balasting in the hull? There's a home page pic of a US CG rib being deployed out the back of t'muther ship could a smaller scale version of that work? If it's over the back of a jet drive it might still have a high C of G so could be a pig to handle.
The c of g issue is a killer I reckon. That's why I need to buy a big rib. I explained the logic of this to Mrs GJ0KYZ....., you can guess the rest.
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Old 30 November 2010, 14:13   #29
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The c of g issue is a killer I reckon. That's why I need to buy a big rib. I explained the logic of this to Mrs GJ0KYZ....., you can guess the rest.
...Surely the ultimate solution would be a small shallow draft rib - something like a Zodiac Pro 4.2m maybe - with a small - 2.4m? - slatted floor SIB stowed in it. You get as far as possible with the Pro, and then pump up the SIB, fold out a couple o' oars and Matt's ur uncle
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Old 30 November 2010, 15:23   #30
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...Surely the ultimate solution would be a small shallow draft rib - something like a Zodiac Pro 4.2m maybe - with a small - 2.4m? - slatted floor SIB stowed in it. You get as far as possible with the Pro, and then pump up the SIB, fold out a couple o' oars and Matt's ur uncle
I know what your saying, but Jersey to the bay of Mont St. Michel would be a long way in a 4m rib; it's a long way even in a 6.8m rib when it's blowing hard.
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