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Old 21 September 2012, 15:16   #11
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Originally Posted by vjmehra View Post
Yep makes sense, or alternatively, we could pick up a 10hp auxilary, I'm guessing we may be able to find an old 2-stroke (to keep the weight down) for around 500 ish (or is that too optomistic)?
You certainly don't need a 10hp auxie on a 5.5m Assault - I'd imagine a 5hp would be more than enough. 99.9% of the time, the auxie is there to provide peace of mind, not save the day, but it's worth every penny just for that alone. However, on the day the big lump chokes, the ability to have some control of your destiny has to be a good feeling...
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Old 21 September 2012, 15:20   #12
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Ah cool, thats good to know, that'll save us a few quid :-)
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Old 21 September 2012, 15:26   #13
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Ah cool, thats good to know, that'll save us a few quid :-)
I'm basing that on it being a light, narrowish hull with a mid Vee. If you don't overload the RIB, 5hp should deal with a lot. How you mount it and the prop will have some bearing too. You'll have to measure the transom/bracket fitting location to determine the shaft length. I would assume long shaft, but you might get away with short shaft, depending.
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Old 21 September 2012, 15:30   #14
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That will be part of our winter refurb :-)

Which starts as soon as we can find a trailer!
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Old 21 September 2012, 19:00   #15
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An auxiliary is good, but there are lots of boats with only one engine, a rigid maintenance plan and not making do can be just as effective , single engined aircraft don't carry a spare.
Have you seen how much it costs to keep an aircraft engine maintained?

Cheaper to buy an aux!
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Old 21 September 2012, 20:27   #16
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An auxiliary is good, but there are lots of boats with only one engine, a rigid maintenance plan and not making do can be just as effective , single engined aircraft don't carry a spare.
but this does not prevent the unexpected ... bad fuel etc...

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Old 21 September 2012, 20:40   #17
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Our plan (budget permitting) is to have an aux 5-10hp, we carry 2 seperate portable tanks on board (although admitedly the odds are they would be filled from the same pump) the two engines may not necessarily run from the same tank.

As a side question...do people ever use their aux engines for slow speed manouvering?

I was just thinking, it may actually be beneficial to switch over to a lower hp engine, when returning to the marina.
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Old 21 September 2012, 22:42   #18
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Our plan (budget permitting) is to have an aux 5-10hp, we carry 2 seperate portable tanks on board (although admitedly the odds are they would be filled from the same pump) the two engines may not necessarily run from the same tank.

As a side question...do people ever use their aux engines for slow speed manouvering?

I was just thinking, it may actually be beneficial to switch over to a lower hp engine, when returning to the marina.
Hello vjmerhra,
As mentioned you really don't need a 10hp, that sort of weight on your RIB might effect handling at speed, causing poor balance issue's, plus you would probably restrict the steering of your main engine if left fixed on transom, I would go as far to say, that a 2.5 or 4hp would be plenty, that's what i've used with my 7m rib, even against 2kn current,
As for other than emergency use, personally yes I use my short shaft aux for trolling and general low speed cruising, using the main engine for helming, (main reason cus there a bugger to control direction with tiller other than short distance, and generally more comfortable) but you need either a crew member to operate the throttle, or a pole over the twist grip, or you'll have to go back and forth controlling youself, which is easy enough when you get the hang of it. plus you can always overide the power with main if neccesary.
I would only use main when entering marina though, that's where you'll need full control the most.
Plus you'll save loads on fuel if just pottering around with aux.
All food for thought I hope.
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Old 22 September 2012, 07:35   #19
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All makes sense, many thanks for your advice, we're thinking of adding some jockey seats too, so the less additional weight at the back the better, so if we can get away with a smaller engine all the better!
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