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Old 30 September 2012, 19:00   #31
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Quote:
Originally Posted by tony t

Mate ... Us plasterers have arms like Popeye who the fook needs a battery to turn the paddle
Well, the ones that do the plastering for the Rib cruising bosses do anyway

Domino runs very well on 4 stroke plaster mixers from what I've seen. (Thumbs)

Poly's on one tonight! Must have learnt to touch type.
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Old 01 October 2012, 04:06   #32
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Originally Posted by Anchorhandler View Post
I wonder if they say that to the contestents on " Who wants to be a millionaire"?......" FFS dont trust the audience for an answer...they all think their experts"...

Yes, maybe but when 85% of the audience agree on something then there's probably a good chance that they may be right...

Same aplies on here...if 12 people say to use a 2-3.5 hp outboard but 2 people say you need a 25hp minimum then.....well you get the picture.

BTW, I feel you need a minimum of 8hp which funny enough i will be putting one up for sale shortly...

Simon

well said Simon and I have changed my mind as I was thinking that you should not follow everyone else as I was playing lemmings last night and the all died because that's what they did.

so after ages of thinking this through....

you should buy 2nd hand ones as you can never be to safe and if your aux fails as well as your main engine that could be the end of of you.

funny enough just like Simon I have 2 in stock and just to be extra extra safe you can have my old plaster mixer as well so that way 3 engines could fail and you will still get back.
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Old 01 October 2012, 08:50   #33
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you wont get a sensible answer on here mate, not one that I would trust , phone up the rnli and ask them, at least its from the horses mouth. You dont know who's who on here. All you'll get is a load of mixed opinions from people who think they are all experts. This site is really an SEO operation for rib related firms. If someone on here has a 5 hp engine for sale , they will say 5hp etc. You get the picture !
What you absolutely must have is an old Johnson 1975 4Hp Longhshaft in Light blue livery with an Evenrude cowl top in dark blue livery drilled because the choke on the '75 engine was at the opposite side to every other year of production and a modified clamp to go round your towing eye in the old 60's khaki green colour. I have one here for 5K - 4.5K & it's yours!




Ok, being serious, Gramas, for a rib that size, you are realistically looking at 3-5Hp. If you travel places with big currents, lean towards the 5 end. Long Vs short shaft, plenty of people where you lauch will probably allow you to borrow their aux for 2 mins to hang on your transom to see if the prop comes anywhere near the water

I can (just) use a short shaft on mine - IF I sit on the back toob - otherwise the first sign of a wave & the prop lifts out. Longshaft I can sit on the seat & the prop stays in.
As Poly & others have said, transom height is the decider there. (and remember a Longshaft small Hp engine is shorter than a Longshaft "big" HP engine).
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Old 01 October 2012, 13:44   #34
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Mr Spareribs,
When I started reading your initial post, I agreed........you aren't very likely to get a "serious" response.
What you will get is one (many) based upon experience. You distill the answers and draw your conclusions.
Do you know Mr Squidward?
And have you got a Defender that you're selling?
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Old 01 October 2012, 16:29   #35
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by way of slightly useful input a 2.2HP 2 stroke Yamaha Malta was not enough to push my 4.8m rib against any wind or current - on that basis I would say at least 4HP. The other thing about the really small OB's is they tend not to have gearboxes which I found to be a nuisance as you cant warm them up easily to be sure they will start when you need them to.
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Old 01 October 2012, 16:43   #36
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I run a 15 2st long shaft on a custom made bracket
With separate 25 l portable fuel tank
I also use it in very shallow water to protect the main
It's pulled a couple of Vipermax's along from a shallow anchorage to deeper water
Jim
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Old 02 October 2012, 04:16   #37
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I run a 15 2st long shaft on a custom made bracket
With separate 25 l portable fuel tank
I also use it in very shallow water to protect the main
It's pulled a couple of Vipermax's along from a shallow anchorage to deeper water
Jim
Yeah but you have " Length: 7m+" - 15Hp could be the main engine on a 4m!


Tomkat does have a point tho'. I used a 2 on mine for about 2 outings. Outside the marina it was remarkably close to a chocolate fireguard, admittedly partly due to the shaft length (or lack thereof).

As for the warming up, the small engines are designed to be started & used from cold. Once you get into 4-ish Hp territory some have a simple "stop - go" clutch, and some have full F-N-R. THing wioth F-N-R is there is usually a big lever on the side, that if you have an A- frame suddenly might fill the extra 3 inches clearance you don't have! Mine is "on or off" - not even a clutch, but at anything below about 1/3 throttle it has as near as no forward thrust anyway, so it can be started, brought back down to idle & might as well be in neutral.

I "brass necked" a couple of "can I borrow your aux for 2 mins to see if it fits" moments to see what engines would & wouldn't fit. Well worth the time spent, coz what the paper data doesn't tell you is where the bulge in the case (max width) is...



I think I'm safe in summarising here that get as many gee gess as you can fit on, and the rest is down to your preference / transom geometry.
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Old 02 October 2012, 07:40   #38
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Bear in mind the max transom weight of your RIB when you choose an aux o/b.

A popular choice for 4+m RIB is the Merc/Mariner/Twatsoo 3.3/3.5hp 2-stroke. I use one on an SR4.7 and it moves the boat at around 4-5kts. They're lightweight, narrow and reliable, so tick a lot of boxes in the 'Which aux motor?' debate.
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Old 02 October 2012, 07:42   #39
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Originally Posted by Downhilldai View Post
Bear in mind the max transom weight of your RIB when you choose an aux o/b.

A popular choice for 4+m RIB is the Merc/Mariner/Twatsoo 3.3/3.5hp 2-stroke. I use one on an SR4.7 and it moves the boat at around 4-5kts. They're lightweight, narrow and reliable, so tick a lot of boxes in the 'Which aux motor?' debate.
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Old 02 October 2012, 08:28   #40
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Quote:
Originally Posted by Downhilldai View Post
Bear in mind the max transom weight of your RIB when you choose an aux o/b.

A popular choice for 4+m RIB is the Merc/Mariner/Twatsoo 3.3/3.5hp 2-stroke. I use one on an SR4.7 and it moves the boat at around 4-5kts. They're lightweight, narrow and reliable, so tick a lot of boxes in the 'Which aux motor?' debate.
+1.

The only downside to all those boxes being ticked is finding one!
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