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Old 09 May 2011, 08:36   #11
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I'm resurrecting this thread because I'm now at the stage that I have to source an auxilliary before heading to the west coast in mid July. With the main engine (Twatsoo 60hp) now in position, there is just enough space at the starboard side for a small 2-stroke engine, up to 4hp. From a quick measure of the transom at this point, a standard shaft would fit (say 19" depth from outboard saddle/bracket to top of anti-cavitation plate), although a long-shaft might prove to be more reliable given the extra depth. Any preference for which shaft length you would go for? Any pictures in position would be helpful too.
There's a Mercury 3.3 (same engine as the 3.5 Twatsoo) on ebay at the moment in Wooton Bassett for 150 quid with a broken prop. Don't be tempted-I went to see it yesterday and it's horrendously corroded under the hood. I'll give the guy his due-it's cheap and runs OK-but I wouldn't rely on it-it looks like cooling water is seeping out at the head gasket face.
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Old 09 May 2011, 13:11   #12
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There's a Mercury 3.3 (same engine as the 3.5 Twatsoo) on ebay at the moment in Wooton Bassett for 150 quid with a broken prop. Don't be tempted-I went to see it yesterday and it's horrendously corroded under the hood. I'll give the guy his due-it's cheap and runs OK-but I wouldn't rely on it-it looks like cooling water is seeping out at the head gasket face.
Thanks for the heads up on that one. There was a mint Yammie Malta that finished on Ebay last night. Most owners don't want the added hassle of shipping which narrows down my options. Worst-case scenraio I simply don't have one for the trip, although I'll continue to look.
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Old 11 May 2011, 19:18   #13
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New boat, new engine get a radio and the CG will send someone should you need them but with new reliable kit, I wouldn't fret too much...yes there is always the chance but it is one you take. But if you have cash to burn then ask rib craft what they would suggest about size and fitment.
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Old 12 May 2011, 06:12   #14
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The other one that seems to pop up with monotonous regularity is the old OMC twin pot 4 HP. They are a bit oldschool in their design, but that does mean they pop up ten a penny. Also if one pot dies, it will still go!

It's lightweight (13 KG) and relatively narrow for a 4, so more likely to be able to fit it.

Main down side is no "keep it up" catch, so you need to be creative with a bit of bungee & a block of wood.
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Old 12 May 2011, 12:34   #15
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The other one that seems to pop up with monotonous regularity is the old OMC twin pot 4 HP.
Yes, got one of those in the garage too: 175 anyone?
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Old 12 May 2011, 15:35   #16
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I have a similar sized rib as you, ie a Tornado 5mtr and for many years I didn't have an aux OB. However last year I bought a longshaft Yam Malta ( think its about 4hp) in mint condition from a mate. Its absolutely perfect on my RIB, it sits alongside the main 60hp 2s OB on the transom and when tilted up doesnt catch the water or foul any of the fuel or control lines etc. It runs really well and perhaps the only downside is that with its built in fuel tank doesn't have a facility to connect it to a remote tank but it does seem to go for ages on its small tank.

I think you will almost certainly need a longshaft if its mounted alongside the main.

The technique I use when I use it, which I try and do on every trip, is to fix the steering straight ahead and steer with the main OB from the consul. It seems to be fast enough and in slack water is about 5 kts or mph, can't remember which! As somebody said its better than paddling!

The yam seems fine and while it looks mint just changed out the impeller, gearbox oil and plug when I first got it. I don't think a 4s would have fitted directly on the transom and allowed the main OB to turn fully.

It is a nice little bit of safety kit and makes me feel better when I take the boat offshore.


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Old 14 May 2011, 13:00   #17
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I have a Ribcraft 5.3 with Suzuki 90 4stroke main and use a Tohatsu 4hp 2stroke L/S as auxillary. That auxillary engine when I bought it only had internal tank option but I have converted it to also use an external tank using readily available tubing, T-connecters and the connecter for the external tank.
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Old 15 May 2011, 05:51   #18
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If your still looking...
Storrar Marine in Newcastle have a NEW 2 stroke Mercury Longshaft 3.5hp instock, must be about the last in the country I think.
I dont know the price - if your interested make them an offer.
Being the 2 stroke its narrow - good thing for an aux I think.
I have a Tohatsu 3.5 aux, not fitted it yet... project for this summer I think.
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Old 15 May 2011, 07:09   #19
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I know its a different boat but I have a Mariner 5hp on my Valiant DR750. FWIW I would go for the longer shaft as the boat will be floundering a bit in any chop and the last thing you want is that the prop continually lifts out of the 'oggin. You'll have more drag yes but that will be minimal at the slow speeds you will be doing.

Do make sure that the whole thing clears the water when its lifted. Mine does - just!
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Old 15 May 2011, 16:21   #20
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If your still looking...
Storrar Marine in Newcastle have a NEW 2 stroke Mercury Longshaft 3.5hp instock, must be about the last in the country I think.
I dont know the price - if your interested make them an offer.
Being the 2 stroke its narrow - good thing for an aux I think.
I have a Tohatsu 3.5 aux, not fitted it yet... project for this summer I think.
Thanks for that, but it will have to be second-hand I'm afraid. I had a new Tohatsu 3.5hp long-shaft auxilliary but sold it with the last boat... doh!
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