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Old 09 June 2003, 07:10   #11
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Country: UK - England
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Make: Ribtec, Ballistic, C
Engine: 40hp 4 strokes - twi
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One thing to think about when considering a small auxiliary is that one of the main causes of engine failure is fuel contamination. This means that your auxiliary won’t work of the main tank either. I carry a 4hp evenruide that we have had for years. It pushes my 5.85 ribtec along at 4 knots and uses very little fuel. I just carry a small outboard tank of premixed fuel / oil. If I ran out then I would consider taking from the main tank.

My personal preference would always to be to go for a twin. Other main causes of engine failer other than fuel are things around the prop, twins reduce the risk but can be very messy if a line or net is caught around both props.

If putting twin setup together things to think about

2 fuel tanks (though if the problem is water from a fuel tank the chances are they will both be the same. It is nice to be able to transfer fuel between the 2 tanks as if you are motoring slowly you may only use one engine and their for use fuel from one tank.

2 oil systems (if 2 stroke)

Twin electric. Defiantly worth it.

A hinged steering system to allow you to trim one engine up completely witought bending the steering bar. If you do have to use one engine the only chance of getting onto the plain with a single 60 is if you don’t have the drag from the other engine. I have used a cobra with twin 55 that will just go on the plain with one and no fuel and a following wind, and a ribtec with twin 60s that needed both engines. (other twins I have used have been more powerful)

The twin yam 60 4 stroke is a nice set up it is very quiet at all speeds. I.e. you can talk and easily hear each other even when stood by them at full chat. Very economical at 2 thirds power. 40 odd litres for a 2 day advanced course Plus night exercise. I have used an identical boat with a single 115 ficht on the back and their is not much difference between the 2 in terms of performance.
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Old 09 June 2003, 07:49   #12
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Thanks for the picture, Geoff.

Food for thought
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Age and treachery will always overcome youth and skill! Bullshit and brilliance only come with age and experience.
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Old 09 June 2003, 08:41   #13
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yes pic is good I think I might try somthing similar!

Thanks
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Old 10 June 2003, 12:23   #14
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Country: UK - Scotland
Boat name: Halcyon
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Length: 8m +
Engine: Yamaha ME422 240hp
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I use a mariner 4hp on my 5.5m Northcraft which does a great job. Fits directly on the transom and still allows full movement of main engine.
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Old 10 June 2003, 17:20   #15
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Country: UK - England
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MMSI: 235036477
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Amazing Info ... !

Thank you all for your input.

Rick - Great picture - It's like being there (if only ...)

As mentioned earlier, I have started a further thread, "one lump or two?" on the basis that the justification for either course of action was unclear.

Having just looked at the Yamaha site, which includes "Performance Bulletins", I was amazed to see the relative fuel consumption of two engines, as opposed to one, which puts the "economy" of 2 x "conventional" four stroke 60's not much different to the 5.7 litre V8 fuel-guzzling monster, which lurks in my present boat.

Please have a look at my other thread, for some eye-opening statistics!

Chris
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