Cranes - Page 2

GJ0KYZ · 28 November 2010, 13:23

Quote:

Originally Posted by spartacus

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.

spartacus · 28 November 2010, 17:28

Quote:

Originally Posted by GJ0KYZ

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.

karlT · 28 November 2010, 21:31

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.

Roger Barr · 29 November 2010, 12:00

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,

GJ0KYZ · 29 November 2010, 20:32

Quote:

Originally Posted by karlT

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?

martini · 29 November 2010, 21:01

Quote:

Originally Posted by GJ0KYZ

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!

Simon B · 30 November 2010, 12:40

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.

GJ0KYZ · 30 November 2010, 18:18

Quote:

Originally Posted by Simon B

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.

gotchiguy · 30 November 2010, 19:13

Quote:

Originally Posted by GJ0KYZ

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

GJ0KYZ · 30 November 2010, 20:23

Quote:

Originally Posted by gotchiguy

...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.

gotchiguy · 30 November 2010, 21:05

Surely the absolute ultimate solution would be "Le Grand Bleu" off of which you deployed the 40ft Fairline which motored you in closer and then deployed one of those Protector Jetski-Rib things from which you shed the RIB collar and then motored right in

Seems a little extreme just to get to MSM though?

gotchiguy · 30 November 2010, 21:28

Quote:

Originally Posted by GJ0KYZ

Quote:

Originally Posted by gotchiguy

...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.

There was an old RIB who swallowed a tender.
I dunno why she swallowed that tender,
Perhaps she'll sink.

There was an old RIB who swallowed a Jetski,
That wiggled and wiggled and tickled inside her.
She swallowed the Jetski to catch the tender.
But I dunno why she swallowed that tender -
Perhaps she'll sink.

There was an RIB who swallowed a Searider;
How absurd, to swallow a Searider!
She swallowed the Searider to catch the Jetski
That wiggled and wiggled and tickled inside her.
She swallowed the Jetski to catch the tender.
But I dunno why she swallowed that tender -
Perhaps she'll sink.

There was an RIB who swallowed a Humber.
Imagine that, she swallowed a Humber.
She swallowed the Humber to catch the Searider ...
She swallowed the Searider to catch the jetski
That wiggled and wiggled and tickled inside her.
She swallowed the jetski to catch the tender.
But I dunno why she swallowed that tender
Perhaps she'll sink.

There was an RIB who swallowed a Ribeye.
What a hog! To swallow a Ribeye!
She swallowed the Ribeye to catch the Humber...
She swallowed the Humber to catch the Searider ...
She swallowed the Searider to catch the Jetski
That wiggled and wiggled and tickled inside her.
She swallowed the Jetski to catch the Tender.
But I dunno why she swallowed that Tender
Perhaps she'll sink.

There was an RIB who swallowed a Ribcraft.
Just opened her throat and swallowed a Ribcraft!
She swallowed the Ribcraft to catch the Ribeye ...
She swallowed the Ribeye to catch the Humber.
She swallowed the Humber to catch the Searider ...
She swallowed the Searider to catch the Jetski
That wiggled and wiggled and tickled inside her.
She swallowed the Jetski to catch the Tender.
But I dunno why she swallowed that Tender
Perhaps she'll sink.

There was an RIB who swallowed a Osprey.
I don't know how she swallowed a Osprey!
She swallowed the Osprey to catch the Ribcraft...
She swallowed the Ribcraft to catch the Ribeye...
She swallowed the Ribeye to catch the Humber...
She swallowed the Humber to catch the Searider ...
She swallowed the Searider to catch the Jetski
That wiggled and wiggled and tickled inside her.
She swallowed the Jetski to catch the Tender.
But I dunno why she swallowed that Tender
Perhaps she'll sink.

There was an RIB who swallowed a Halmatic -
She's sunk, of course.

martini · 30 November 2010, 22:22

karlT · 30 November 2010, 22:32

Very Good - probably a contender for post of the year !!!!

Chris · 30 November 2010, 23:11

you have waaaaay too much free time Oliver.

gotchiguy · 01 December 2010, 14:41

Quote:

Originally Posted by Chris

you have waaaaay too much free time Oliver.

Pfffft! I wish!

Poly · 01 December 2010, 15:27

GG, all that money on education and there are still a few school-boy errors in there! However if we can get them fixed, then you can probably submit this as legitiamite coursework for GCSE English!

Firstly, after the first verse you stop referring to her as an "old" RIB and therefore the correct indefinite article is simple a not an.

Quote:

Originally Posted by gotchiguy

There was [strike]an[/strike] a RIB who swallowed a Searider;

Secondly, you've lost the rhyme found in the original nursery rhyme. e.g. fly -- die; bird -- absurd, etc...

gotchiguy · 01 December 2010, 15:43

Quote:

Originally Posted by Polwart

GG, all that money on education and there are still a few school-boy errors in there! However if we can get them fixed, then you can probably submit this as legitiamite coursework for GCSE English!

Firstly, after the first verse you stop referring to her as an "old" RIB and therefore the correct indefinite article is simple a not an.

There was an RIB who swallowed a Searider;
Secondly, you've lost the rhyme found in the original nursery rhyme. e.g. fly -- die; bird -- absurd, etc...

Yeah yeah I know! The reason is that after the first verse I got bored writing it out by hand and simply did find & replace, you don't expect me to have written that off by heart do you

I didn't bother doing the rhyming 'cos I wasn't sure what the reaction to it would be. As it appears to be positive, I'll have a think about some couplets maybe

Erin · 01 December 2010, 19:36

Quote:

Originally Posted by Polwart

However if we can get them fixed, then you can probably submit this as legitiamite coursework for GCSE English!

Pot calling kettle..... and all that. Back to school Mr Polwart

Poly · 01 December 2010, 21:44

Quote:

Originally Posted by Erin

Pot calling kettle..... and all that. Back to school Mr Polwart

Yip my education was worth every penny it didn't cost!