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Old 05 October 2016, 18:01   #1
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Country: UK - Scotland
Make: Gemini
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Help in finding model and age of Gemini rib

Hi all, I'm wondering if any has much knowledge on Gemini ribs. I have recently picked this old girl up as a project but don't not much about it at all or Gemini ribs for that matter.
So really the first question is can you tell from the serial number what model it is and what year it was made? Any other great advice on Gemini's would be handy too. The tubes don't stay up for longer than a day and to be honest I feel that they'll probably need replaced as opposed to trying to tidy them up and seal them but that will be price dependant and whether it's worth doing on the value of this rib when complete.
Look forward to hearing your views and info. Regards
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Old 06 October 2016, 06:40   #2
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Boat name: Merlin
Make: RB4 Gemini 550
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This looks like a 470 wave rider
but they are only rated to 70hp.
So from the plate it could be 550 Wave rider - it would be rated to 115 hp.
Just doesn't look long enough. How long is it?
Does it have a stainless steel keel guard?
Can you post a picture of the deck?
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Old 06 October 2016, 06:48   #3
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That looks like a very good project
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Old 06 October 2016, 18:02   #4
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Quote:
Originally Posted by MustRib View Post
This looks like a 470 wave rider
but they are only rated to 70hp.
So from the plate it could be 550 Wave rider - it would be rated to 115 hp.
Just doesn't look long enough. How long is it?
Does it have a stainless steel keel guard?
Can you post a picture of the deck?
Hi and thanks for your time, I've been out and ran a tape measure and the deck from transom to tip is about 4.1m. The tubes are totally flat now so hard to get a fairly accurate measurement of the tubes but roughly from transom to the end of the cones is about 0.7m and there'll be a bit more length from the tip of the hull to the front point of the tubes at a guess so its more than 4.7m assuming thats what the 470 translates too but may not be as long 5.5m.

There is a keel guard on it which has been painted so assuming it will be stainless as you mentioned.

Is there a database of serial numbers anywhere that you know of?

Here are a few more pics if they are any more help.
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Old 06 October 2016, 18:05   #5
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Quote:
Originally Posted by two stroke mick View Post
That looks like a very good project
Thanks Mick its certainly going to take some time and probably cost me a fortune but will be enjoyable to get into
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Old 07 October 2016, 07:11   #6
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Country: UK - England
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Boat name: Merlin
Make: RB4 Gemini 550
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This looks like its a 5.05 WR
For comparison here are the specs

WaveRider 505
Length Overall 5.05m / 161⁄2’
Length Inside 3.85m / 13’
Beam Overall 2.2m / 7’
Beam Inside 1.2m / 4’
Dead rise 26
Tube Diameter 460 mm
Weight 220 kg
Max. Load 1080 kg
Max. Pax 10 ppl
Max. Power 115hp
Rec. Power 90hp

WaveRider 470
LOA 4.7m / 151⁄2’
L I 3.44m / 111⁄2’
BOA 2m / 61⁄2’
BI 1m / 31⁄2’
DR 22
TD 460 mm
Weight 150 kg
ML 1050 kg
M PAX 7ppl
M PWR 70 hp
Rec Power 90hp

Sounds to me like you have a 5.05 m
The boats have great lay up.. capable (more capable than the drivers )
The SS Keel strip is a big plus in everyday use.
Check the baffles are still up inside the Tubes, mine were blown when I picked up the boat
and the seams had also blown in a few places so I retubed mine.
Check if it has one of those captive ball deck drains in the transom, and make
sure you replace it or remove it - they are not so reliable.
Have fun with it - should be a great boat when you fix it up.
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Old 01 November 2016, 09:39   #7
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Brandane, if you need any help or advice please contact Gemini Marine UK on 01590 675621 or sales@gemini-marine.co.uk.
We are based in Lymington on the South Coast and are the exclusive dealers for all Gemini products in the UK & Ireland.
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Old 31 May 2017, 17:21   #8
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Country: New Zealand
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Make: Gemini Waverider 550
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A bit late coming to this conversation...

You could also contact Gemini Marine in South Africa. I sent them a photo of the plate on my transom along with a photo of the boat and they confirmed the year of manufacture for me as well as sending me a Buoyancy Certificate with a photo of my RIB on it.

Hope this helps.
Richard
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Old 01 June 2017, 05:14   #9
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Make: Gemini Waverider 550
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There is a photo of a 25 year old Gemini 500 with a similar plate on the Gemini Marine Boats Facebook page.
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