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Old 04 January 2016, 18:41   #1
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New SIB

My father is selling his small 20ft yacht having finally decided that it's too much hassle to launch and recover - he's in his mid 70s now. However he would still like to be able to get out and potter around on the water now and again on a nice sunny day.

I've suggested that he considers a biggish SIB (3.5m - 4m) and while I know very little about them there seems to be a decent choice - something like the Excel Vanguard 395 or the bigger Honwaves would probably fit the bill for sensible money.

However the main element of cost is going to be whether or not he needs to buy a new motor. I've just come away from a Google search slightly open-mouthed at the cost of a nice four stroke 15hp motor, and I wondered how a boat in this sort of size range would perform with a small outboard - he already has a 2.3hp engine for his little tender. My 4hp aux will push about a tonne of Vipermax along at about 4 knots on a good day - what speed would 2.3hp achieve in a light SIB, 2 pax, total weight of boat pax and engine maybe 300-400kg? Planing is obviously not on the agenda but I wondered what is realistic.

Any thoughts welcome on choice of boat, suitability of existing motor or (if completely unsuitable) what sort of HP would be a sensible minimum so I can present him with some ideas and prices. Thanks
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Old 05 January 2016, 02:40   #2
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When I'm 70 I hope I'll still want to potter on the water... in fact if I could potter I reckon I'd still want to plane. The ability to plane adds safety.

What about Beerbelly's outfit as an idea? Smaller than you mention but fine for one of with a plus one.

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Old 05 January 2016, 05:40   #3
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If you're considering new I would definitely speak to Ely Boat Chandlers... I bought my Honwave T38 + 20HP Honda brand new from them just before Christmas for at least 500 cheaper than the nearest competition I could find online. that included a pre-Xmas Honda deal saving me an extra 100-odd but they were still vastly cheaper than anyone else I could find regardless of the extra deal.
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Old 05 January 2016, 05:45   #4
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I think portability of the motor is going to be the biggest challenge and everyone raves about the 9.8HP Tohatsu if you can find one
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Old 05 January 2016, 05:48   #5
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I take it your farther is in the Falkland too? As this is a big factor in to the cost!
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Old 05 January 2016, 05:58   #6
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Fair point. Ideally I would like it to plane as well (because I might borrow it when I'm out that way!) but I'm just trying to figure out what the different options might look like so I can have a discussion along the lines of "if you spend this much and use your old engine it will perform like this but you might want to spend this much and get a new engine which will perform like this".

I see from the "Which SIB" thread that you really want 15hp to be able to plane comfortably two-up, so that's the top end option but I suspect it is probably going to be more than he's prepared to spend. He is also here in the FI so would prefer to buy new/boxed for ease of shipment (and the VAT exemption helps!)

But I'd still like to know what a realistic speed would be with a small motor like the 2.3hp he already has - if it manages 5 or 6 knots that is probably fine, if it will only do 2 knots or grind to a halt in more than 10 knots of wind, then it probably isn't.

I have a 3.1m tender and I think he'd want something significantly bigger - nearer 4m.
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Old 05 January 2016, 06:23   #7
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Is the Falklands EU? If not you may be able to legally still buy a 2 stroke. Yam 15hp would do the job.

A 2.3hp on a SIB will give you displacement speed - probably no more than about 4 / 4.5 knots. It won't be any slower than your 3.1m.

Is the 2.3hp a long or standard shaft. Nothing wrong with having a selection of engines (not that my wife would agree!) for different roles as long as they all fit the boat.

Aerotec?
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Old 05 January 2016, 06:32   #8
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Is the Falklands EU?
Yeah, along with Argentina and Chile.
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Old 05 January 2016, 06:42   #9
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I see from the "Which SIB" thread that you really want 15hp to be able to plane comfortably two-up, so that's the top end option but I suspect it is probably going to be more than he's prepared to spend. He is also here in the FI so would prefer to buy new/boxed for ease of shipment (and the VAT exemption helps!)
Does that mean you are also able to get your hands on old tech 2-strokes? Not only would that be easier for manual handling I presume they are still cheaper.

Do you need to plane 2-up? presumably if you are both going out you can take the RIB?

Quote:
But I'd still like to know what a realistic speed would be with a small motor like the 2.3hp he already has - if it manages 5 or 6 knots that is probably fine,
I doubt he'll get 6 knots. I used to get ~4 from a 2HP Honda on a pretty light sailing dinghy with a non-draggy bottom with 140 kg of crew weight. By that point the air cooled engine had deafened you anyway! Not sure "hull speed" really applies to SIBS but 6 knots would need you to at least be thinking about getting out of displacement mode on a boat that size.

Or, is he really angling for you keeping the RIB on a mooring and he can just use the tender to get to it?
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Old 05 January 2016, 12:01   #10
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What would you do with a bunch of SIBs in the FI's anyway?

Confuse penguins I assume...

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