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Old 17 September 2006, 19:05   #11
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yacht...

My yacht only 5 knots flat out anyway.. hence I bought another RIB!!
I used to have a 2hp honda on my 4m SR and got 4 knots out of it.. I was impressed by that...
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Old 17 September 2006, 19:08   #12
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Quote:
Originally Posted by Limey Linda
I think the message so far is that " bigger is not always better"

Regards, to all.
I reckon so. I'd hate to try and control a 9 or 10 metre rib with a little aux engine in a decent breeze. I'm gonna do some more practicing on mine before I need to use it in anger (which I hope I don't of course) and also to put a few hours on the engine in case I suddenly need to run the poor thing at WOT for a sustained period, not a good idea on a brand new motor...

The cool thing about the aux is that because you can get 90 deg of lock in one direction, you can spin the boat on the spot. When you open the 6hp to WOT doing this, it fairly whizzes around. I got some odd looks doing rapid pirouettes on the seafront the other weekend, but for some reason it appealed to my puerile mind
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Old 17 September 2006, 19:14   #13
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Boat name: WhiteNoise/Dominator
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Quote:
Originally Posted by Limey Linda
I think the message so far is that " bigger is not always better"

Regards, to all.
I'd always err on the side of bigger is better.
It makes no odds what speed your aux will push your boat at in flat calm-It's far more likely you'll need to use it in crap weather (sod's law) and a toy engine won't be a lot of use if it can't push you over the waves or against the wind-which you can garuantee is going to be right on the nose(more sod's law).

I played with auxilary sizes on my old boat (a 5m microplus<spit>hardboat) with a full weekend's worth of gear aboard a few weeks before I bought the SR4.
Over 2 weekends I used a 9.8 Mercury, a Seagull 40+(3hp) , a 4hp Johnnyrude and a 5hp Crescent on it in both flat calm, and various conditions including wind against tide with a bit of chop:-

The 9.8 (which was too heavy really and was the engine that was on it when I got it)made 8.5 knots in flat calm but would do it into f4-5 and still made 5 knots in a medium sea with the odd small whitecap. It was a pain having it on a drop-down bracket though and it made the boat too stern-heavy.
The Seagull made 3 knots but managed better than the Crescent and the Evinrude in a slight sea, wind against tide.
The Evinrude and the Crescent both made 3-4 knots in flat calm and were just about usable in a slight sea but were bloody useless in wind against tide.

Bear in mind the Microplus is a heavy boat-but after trying those out I wouldn't assume small is OK. If there's any option get the biggest PRACTICAL.
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Old 18 September 2006, 17:27   #14
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Boy i wish i,d asked earlier.I guess as normal it boils down to compromise.weight cost and convience and the unknown.Any aux.is better than none if your main engine breaks down.I have actually ended up today with a suzuki 5 hp done apparently 20 minute work 2003 model although at the time of perchase was told it was 1 yr old(theres one born every day)However it seems almost brand new not a bargain like Codders got but I,m content.I will endevour to try it out soon and post results thankyou all for your input and hope others will also post as i think this info is very helpfull to be on record.
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Old 18 September 2006, 18:04   #15
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I am aware the 4hp would struggle in a bad sea, but at the end of the day it's an emergency measure. If I'm on my own, and it's rough as anything, I certainly wouldn't be close up to shore, if the main engine dies there are two options available, 1 is the aux engine, and 2 is the anchor with 50metres of rope, and plenty of chain. Both of these together should hold you in some position, which would give time to get hold of the emergency services should the situation be that dire.

Going through some of the smaller channels here, the tide runs faster than 6knots, so all I could expect the small engine to do is steer me through - putting a 6hp engine on wouldn't give much more benefit.

If you want complete peace of mind, get a dual setup like benc which would get you home on the plane on one engine.

-Alex
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Old 18 September 2006, 18:32   #16
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I use a 6hp 2-stroke Soozook. Never measured the speed, but it's ample to push us along at a decent pace. I'll see what it actually does on the GPS next time out.
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Old 18 September 2006, 18:43   #17
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Quote:
Originally Posted by Alex Brown

Going through some of the smaller channels here, the tide runs faster than 6knots, so all I could expect the small engine to do is steer me through - putting a 6hp engine on wouldn't give much more benefit.


-Alex
True-but in that situation you only need it to get you somewhere safe til the tide is in the direction you want. Not exactly desirable though.

I once spent 9 hours beached in Shell Bay after my gearbox self-destructed and the tide was dropping (springs ). I came back in the next day on the auxiliary as soon as I could refloat it. Luckily the POS boat it was on had a small cabin and the dog made a good hot water bottle
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Old 18 September 2006, 22:39   #18
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Quote:
Originally Posted by Alex Brown
I am aware the 4hp would struggle in a bad sea, but at the end of the day it's an emergency measure. If I'm on my own, and it's rough as anything, I certainly wouldn't be close up to shore, if the main engine dies there are two options available, 1 is the aux engine, and 2 is the anchor with 50metres of rope, and plenty of chain. Both of these together should hold you in some position, which would give time to get hold of the emergency services should the situation be that dire.
I agree with that. I've only just got my aux and when I have been out with a bit of a breeze and only one engine, I have always tried to keep awareness of the wind direction versus any nasty sticky up bits, so if the engine died and I didn't manage to get it going again in less than a minute, I had plenty of room to sling the anchor over the sharp end and yell for help! Not much use doing that if you are only 15 or 20 metres from the shoreline...
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