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Old 30 December 2011, 00:57   #1
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Addding cuddy to 5.2m RIB

Hi
I wanted some advice on adding a cuddy to an existing 5.2m GRP/hypalon RIB.

It has been retubed and I am considering adding a small forward cabin for the sake of freeing up space and providing some protection from the elements. Will be built out of aluminium frame and 2 or 3mm plate.

My concerns are the redistribution of weight and changing the COG. I do also plan on setting the outboard further back with a jacking plate or pod 8-10" to help counter the change in COG and to free up some space in the stern. I dont think wind drag will be an issue because of the height of the cabin.
This project i feel is ideal for a larger vessel but for storage reasons i have to stick with this size.

Ive attached a scaled rough sketch (which has scanned badly) to illustrate. Will try to attach some better sketches.

Interested in opinions?
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Old 30 December 2011, 01:12   #2
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How much power is pushing this RIB? Hopefully as much as it will take as I think you'll find the increased windage significant.
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Old 30 December 2011, 05:46   #3
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Quote:
Originally Posted by yallis View Post
This project i feel is ideal for a larger vessel but for storage reasons i have to stick with this size.
I think you know what the problem is. Frankly, I think there's just too much weight forward and too high a COG. That, and the Helm would take a severe pounding as it's bumpiest at the pointy end...

I'm a big fan of cabins, btw. Have a look at some here.
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Old 30 December 2011, 06:41   #4
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Nice example of 6.5m Redbay with console and canvas wrap-round.

More details here: Redbay 650 Wrapround Cabin - FAFB
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Old 30 December 2011, 06:44   #5
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cant you buy an old dory or flyer with a cabin and make a cut and shut.... have sleeping room then
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Old 30 December 2011, 12:41   #6
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Cuddy

Took this photo in local marina today.. if you look close you will notice a 6.5m Humber with full cabin fitted. I have seen it motoring on calm days and it looks good..no idea what it behaves like in the rough
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Old 30 December 2011, 13:14   #7
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better photo

Here is a better photo of Humer with cabin
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Old 30 December 2011, 13:19   #8
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Humber used to do a cuddy which was grp and sat on the tubes. Front end had a lip that slid under a fitting glued to tube and then the rest sat on velcro all round. Also held down by 4 ratchet straps. We used one with Falklands Conservation and it did keep the cold wind off, although the effect of a cuddy moving with the tubes as opposed to with the hull itself was kinda strange. The 5m boat had been re-engined with a new 50 soozi and it got along ok even with a few folk onboard. Pics somewhere when I get off this boat I'm on at the minute.
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Old 31 December 2011, 00:18   #9
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My plan was to bolt the aluminium cuddy to the GRP and build around the tubes with no plan of the cuddy sitting on the tubes as such.

I wonder how these taxis ride as pictured.
I was using their cockpit area as a template for what i was trying to achieve. But i wonder if having the helm so far forward would signifcantly reduce ride comfort in the rough. These taxis do get out in the rough bay chop but granted theyre 7-8m vessels which probably offsets it somewhat.
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Old 01 January 2012, 14:29   #10
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Quote:
Originally Posted by boilermaker1 View Post
Took this photo in local marina today.. if you look close you will notice a 6.5m Humber with full cabin fitted. I have seen it motoring on calm days and it looks good..no idea what it behaves like in the rough
I know that boats owner, I believe he had to build a frame to off set the outboard to account for the extra weight of the cabin, he made the cabin himself.
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