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Old 06 April 2012, 15:58   #1
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swapping from Twin to a single outboard

Recently got a new RIB that previosly was fitted with Twin outboards and I will be fitting a single outboard shortly. I have noticed the exit for bailing is in the centre at present due to the previously fitted positioning of the engines.



Question I have is it as straightforward as I imagine filling this one in and drilling a new one offset to allow for a single outboard?

Any top tips from experience. Thanks in advance

Tris.
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Old 08 April 2012, 14:10   #2
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Pretty much, Just make sure its filled properly by someone who knows what there doing.
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Old 08 April 2012, 15:26   #3
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Plan tomorrow was to drill the new one from the inside out with a circular cutter then use glass fibre filler to seal the cutout into the hole im filling then sand it all flush and paint over it. seal the new hole with the insert & hypalon sleeve and bob is your mothers brother : )

Seems a straighforward job hopefully.
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Old 09 April 2012, 02:53   #4
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Sounds like a good plan, plenty of marine sealant will help seal any open wood once the new hole is cut.

Be careful of the transom strut mid picture - this could cause an issue with engine mounting?
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Old 09 April 2012, 02:59   #5
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Don't think that is an issue looking at the mounting arrangement inside the boat. The majority of the engine bracket is external with the bolts holding the engine on.

Did think about making 2 and placing them either side of the engine but as it had twin outboards before I'm confident this mid strut will be sufficient. Seems to be 2 sizes of elephants trunk online 110mm and 68mm too
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Old 09 April 2012, 04:52   #6
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Check the geometry of the new engine it might foul the strut/knee when tilted, one either side might be a good way to go. Same with your elephants trunks. Keep posting pics so we can see how it come along!
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Old 09 April 2012, 07:08   #7
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Watch the engine height under the frame , mine only just fits , the a frame being made to fit over smaller twins
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Old 09 April 2012, 08:17   #8
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Thanks for that tip Viking not even thought about that. Twins previously fitted were quite big Mariner 60 Bigfoot outboards. Outboard hunting is very slow going at present so concentrating on getting the elephants trunks sorted out and the seat recovered and some stainless flare box holders made up.

May go for one trunk either side as suggested will post up pictures as the job progresses.
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Old 09 April 2012, 09:53   #9
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My ribtec was twins and converted to single, my trunk was moved to the right of the single just gotta make sure when deployed it can't foul the prop. Cox of this I have the one way drain plug, not ideal but works. The engine only just clears the A frame despite it being quite low transom
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Old 11 April 2012, 14:33   #10
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Lots of progress today

New one in pictures below:

Before work commenced:








Will be smoothing it over a bit more yet tomorrow then the transom will be gelcoated in Orange in preparation for the outboard when it arrives. Fitting the Hypalon tomorrow to the hole didnt do it today as the sealant was still going off. Very tight fit and all sealed prior to fitting the insert.
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Old 11 April 2012, 15:20   #11
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Also had the seat re-covered today at the upholsterers and dropped off the mild steel flare box holders from the A Frame. They are being fabricated in Stainless next week. Overall a top day with great results.
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Old 01 May 2012, 12:53   #12
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Been a little while updating this as I have been flat out with work. Managed to get some paint on the transom this weekend and fit the elephants trunk. Hoping to get the new engine fitted soon now I have the security bolts and new control lines.

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Old 01 May 2012, 12:55   #13
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These are now fitted as well but I dont have any photos of them on yet.

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Old 09 May 2012, 14:56   #14
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Engine fitted at last


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Old 09 May 2012, 19:29   #15
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Nice

What make is the rib? Looks like my Northcraft from the back.

How big is the Merc?

D
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Old 10 May 2012, 01:02   #16
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Northshore I think. Do you have any pictures of yours? It's a merc 75hp
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Old 10 May 2012, 02:17   #17
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Click image for larger version

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Take a look at the back. Same as yours I believe.
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Old 10 May 2012, 02:55   #18
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Nice looking tubes. I will upload a better picture of mine tonight from
Above. Great rib I believe it's from 1991
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Old 10 May 2012, 05:37   #19
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Ah, that was 2 years ago. Tubes were covered in rubber as it was a potting boat.

I am just about to have it re-tubed.

The guy that makes the hull is called John and is from Northcraft. He has been making them for a long time and I suspect is retiring soon but a great helpful chap.

It's the only one I've seen with the flat planing pad so I do suspect it is a rebadged northcraft. Is it 6.3meters by any chance?

We could go out as twins

David.
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Old 10 May 2012, 06:30   #20
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Believe it or not I havent measured it yet I think its shorter than 6.3 though. here is a better picture of her:


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