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Old 03 March 2008, 16:59   #1
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Gemini Military Spec SIB

Hi, I've just bought one of these from JBT and I'm going to pick it up in England tomorrow.
I intend to use it for servicing my moorings in Strangford Lough with 2 divers max and maybe one to provide top cover in the sib.
My questions are- I want to use a two stroke tiller steer to power it but what size,25 or 40hp?
Short Shaft or Long?
I also want to do a bit of blasting about with my wife and 5 year old son in the relatively tranquil waters of the lough.
The whole lot comes home in a car trailer aftrerwards.
As I value your expertise, what would you use?
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Old 03 March 2008, 17:09   #2
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You mean these?

My guess is a 40hp short shaft would be ideal.
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Old 03 March 2008, 17:17   #3
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Yep, that's the one. What sort of weight would be in a 40. I'm talking of removing from boat, into trailer, out of trailer, then into wheelie bin to flush, etc... I'm reasonably fit but would I end up with arms like popeye?
Other question. Apparently it's 80kg. Would transom wheels be a good idea?
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Old 03 March 2008, 17:45   #4
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You might be better off with a more suitable sib trailer where you can keep the engine on the boat and run it up with muffs on
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Old 03 March 2008, 18:50   #5
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I really dont think you will lift a 40 hp OB by yourself.
25 hp is about the limit to avoid injury....
The 20hp 2 stroke Yam on my SIB is about my realistic limit without damaging myself or the motor....whilst still being "portable".

Just wait a second though and someone else will be along with
some little known variation of a propriety outboard that weighs less than
a bag of sugar and produces 50hp
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Old 03 March 2008, 19:59   #6
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Yes, plainly agree with MustRib 25/30 HP 2 strokes (52 KG) will be the max to carry in short displacements to avoid injury and pain, 2 buddies will do the job better, as you get older and so your skelleton will only want to carry 5 HP engines...

Will be just fine with a sib trailer to keep engine placed at all the time, have been placing & removing engines on/off sibs for years and now that have a nice trailer my spine is very happy, has found a new transporting mate, highly recommended, a must issue.
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Old 04 March 2008, 03:38   #7
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Quote:
Originally Posted by Slaphead View Post
Hi, I've just bought one of these from JBT and I'm going to pick it up in England tomorrow.
I intend to use it for servicing my moorings in Strangford Lough with 2 divers max and maybe one to provide top cover in the sib.
My questions are- I want to use a two stroke tiller steer to power it but what size,25 or 40hp?
Short Shaft or Long?
I also want to do a bit of blasting about with my wife and 5 year old son in the relatively tranquil waters of the lough.
The whole lot comes home in a car trailer aftrerwards.
As I value your expertise, what would you use?
We used to use one similar to this for ferrying divers about inshore. It originally had a 28hp Yamaha on it and went very well. Later we used it inland with a 8hp short shaft Yammie for ferrying kit about and it was okay,but very slow and the engine would usually over heat!! I would'nt want to go into tidal water-especially Strangford with anything less that about a 25hp and a 40hp you could have some serious fun.
I would get a basic launching trailer for it and just launch/recover from a slip with a 40hp.
Andy
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Old 04 March 2008, 18:16   #8
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Unfortunately I don't have room for another boat trailer at the house so it has to be the car trailer option. I'll maybe just stick with a 25.
Thank you all.
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Old 05 March 2008, 05:03   #9
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I'll maybe just stick with a 25.
I'd agree with that. A 25hp 2-stroke is the largest motor I'd want to carry anywhere.

John
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Old 05 March 2008, 08:46   #10
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Double check the weight you were told...

How long is this boat - 4.2m?, 4.7m? What fabric is it made of?

If it is 'military spec' I would imagine that is boat is made of hypalon (maybe 1100 dtx, but more likely 1670 dtx) rather than PVC. If the boat is 4.2m & 1100 dtx hypalon, it's weight will be alot will be closer to 110 than 80 kg. If it is 4.7m and/or the heavier hypalon it will weigh alot more than that.

I could be wrong about this but the '80kg' is might be transom & fabric only, and not accounting for the floorboards.

Even if it comes in at 80kg, floorboards included, launching wheels will be an absolute must if you aren't going to be launching it directly from a trailer.
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