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Old 02 March 2019, 05:19   #11
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Country: UK - England
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Boat name: Nimrod II
Make: Aerotec 380
Length: 3m +
Engine: Mariner 9.9 4-stroke
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Be worth you working out your total crew weight inc yourself Jerry to give the max load. With that info and experience of 9.9-20hp on the same SIB I can give a good indication how it will go.
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Old 02 March 2019, 05:25   #12
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Max crew would be 200kg (2+2). 25L of fuel, some kit. I'm not counting the dog, it's 1.5kg.
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Old 02 March 2019, 08:52   #13
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Hmmm OK.... thought you might be closer to our load... we are 378lbs with 12l fuel and quite heavy anchor/kit bags.

You will be 62lbs more... plus probably roughly the same kit.

What I do know is adding 112lbs to our normal load blunts performance with the 9.9.

So unless you bought a used 9.9 at a price you could sell on if needed with no/minimal loss then the 15hp 2-stroke is a safer bet.

OBs can be bargains this time of year but the flipside is there are not many on offer. Come early April I bet some decent 15s will come to the market.
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Old 02 March 2019, 09:18   #14
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Country: UK - England
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Boat name: Nimrod II
Make: Aerotec 380
Length: 3m +
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Have you checked out this one... https://www.gumtree.com/p/boats-kaya...ine/1329913417
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Old 02 March 2019, 10:24   #15
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Country: UK - England
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Make: Mercury
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On Boats and Outboards merc , mariner offers if 1749 for a 15 four stroke merc suits Cambridge outboards
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Old 02 March 2019, 11:45   #16
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Country: UK - England
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Boat name: Bombard, Y-162
Make: Aerotec 380, Y-Class
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Engine: Mercury Mariner 15hp
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Quote:
Originally Posted by Jerry View Post
Max crew would be 200kg (2+2). 25L of fuel, some kit. I'm not counting the dog, it's 1.5kg.
You need at *least* a 15!

The Aerotec is a very draggy boat comparable to a Deep V RIB in some respects in the way it drops off the plane easily if you drop power too much.

IME a regular 3.4m sausage keel SIB will do with a 9.9 Tohatsu 2 stroke what an Aerotec needs a 15 to do.

Our Aerotec with the Mercury 15 smoke and around 150kg load will pop up on the plane very nicely but will top out around 16.5 kts. Me on my own and dumping the load it will get 2 kts more.

If you're contemplating a 200kg load then it has to be a 15 hp 2 smoke or a lightweight 20hp 4 stroke.

That's *if* you want to use it in typical UK F3/4 sea conditions and be safe and want to have fun. If you just want to pootle on rivers or 1/2 mile out in calm sea to fish then a 9.8 Tohatsu or say a four stroke 8 hp would be fine.

As Maverick says and it's something that is often repeated on here.

The rule is simple (to expand it a little) - *if* you want to use the boat to its maximum potential with a given crew then:

Rule No. 1: Buy the most powerful engine the boat is rated for that you can manhandle from the car to the launch point.

Simple as that. If there are *always* helping hands then that comes into the equation but it always can only apply to YOU and *your* situation.

ie, one, two, three helping people? kids? strong blokes? hernia prone?, steep shingle? concrete slip? 20 yds? 1/4 mile? All situations are different but just apply rule 1.
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Old 03 March 2019, 02:28   #17
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Boat name: Sula
Make: Ribcraft 4.8m
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Engine: Tohatsu 60hp + aux
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Looks tidy!

There's a mint short shaft Yammie here (pick from Nottingham area). Bidding closes, March 6.
https://www.ebay.co.uk/itm/Yamaha-15...MAAOSw5XJcdvUJ
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Old 03 March 2019, 03:49   #18
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Already checked the engine from Gumtree, seller is away for 3 weeks, we've agreed he'll drop me a line when he's back - we'll see, the pictures look good.
On the Yam, I'm more unlucky - I'll be in the air when the bidding ends.
There's one Merc with replacement hood on eBay, but on that one I'd have to very, very carefully inspect it, and also don't like the black hood.
A quick eBay/Gumtree browse is becoming my morning coffee routine
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Old 03 March 2019, 04:07   #19
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Max, completely agree with Rule 1!
I would go for 20 4stroke if I knew handling wouldn't be an issue. My two sets of crew would be either I with Daniel (9yo, so can't help manhandle the engine just yet) or all of us - the wife could then help with 20hp.

Having both 20 and 9.9 4-strokes to cover both situations would be too much (she'll have a fit if I buy 2 engines!), so this looks like 15hp is a compromise.
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Old 03 March 2019, 04:40   #20
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Jerry take massive care with the seller of the black hood one... their reputation on here is terrible.

And note the Yamaha is on remotes which you don't want and if there's no tiller that's a right faff.

Also beware if you were tempted by a 20hp... having an OB where you need help is OK in theory but there are many reasons at the setup/launch point and back at home when that help might not be available where you end up risking your back.

Hence us just having the 20hp a couple of years before sense prevailed. Much better overall experience with the 9.9... as it would be with a 15 2-stroke as they weigh about the same.
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