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Old 14 May 2015, 13:42   #1
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Will 3.5hp suffice?

Hi ,
I could do with some advice on whether a Mariner four stroke 3.5hp would be okay for a 3.2m Sib for inshore fishing up to half a mile out maximum and only in calm weather.
I've read conflicting opinions , some say a minimum of 6hp+ and others say less would be okay.
If you have any feedback based on experience rather than opinion, it would be greatly appreciated.
I don't expect to get on the plane but would like to think that I can get back to shore against the out going tide or an offshore breeze.
Thanks in advance.
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Old 14 May 2015, 14:06   #2
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You will need to provide a wee bit more information before anyone can answer that honestly. What speed is the tides in the area you intend fishing in..if they are strong tides..then the answer will be no..if not very tidal..then the answer will be yes.

If its round the Firth of Forth in good weather..it should do no problem at all. You will just putter around at displacement speed though.

I have done some major sea adventures with a 2.5hp engine..but I always check there are no strong tides on my route.

This is my 2.5Hp going up Mortimer's Deep..shipping channel on Firth of Forth.. just at half throttle too ..so I speak with experience. Just dont expect to go fast.

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Old 14 May 2015, 14:26   #3
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Another couple of examples..my 3.3hp at full tilt off Arisaig



And my 4hp four stroke...10 miles off shore at Ailsa Craig..however..I like to think Im experienced and know what Im doing..I know the capability of all my boats and engines..so donít try 10 mile open sea crossings..yet



However .. Stay close to shore until you know your boat and engine capabilities.

I wouldnt go through the Cuan Sound with these engines though..and I would need to check tide flow under the Forth Bridge.. 3 knots tide is getting close to a no no situation
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Old 14 May 2015, 15:38   #4
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Thanks for the quick reply. I will be mainly fishing from skateraw at Torness, Eyemouth and Granton.
also a few of the sea lochs out on the west coast.
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Old 15 May 2015, 00:43   #5
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Hi, I have no where near the experience of the other posters, who clearly know exactly how far they can push there outfits, but from my limited experience of a Honda 3.2 it pushed the sib around fine but as it was not powerful enough to lift the front up on my 2.7 honwave, I had a lot of wash coming over the front which was a pain, so sold the Honda bought a Mercury 6 hp 4 stroke which worked great but I found the remote tank took up too much room, selling that now and getting a 5 hp 2 stroke tohatsu,only a couple of hp more but I found gives a bit of additional insurance in case you make a bad call
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Old 15 May 2015, 01:34   #6
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Thanks Mick,
I'll see how the 3.5 performs when the sea is calm. I'm hoping it will meet my needs as I don't intend travelling far ( I've been told the there is reasonable fishing close to my launch point ).
Hope the 5hp works out for you.
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Old 15 May 2015, 02:04   #7
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Hope all goes well and your outboard does the job, if not as I have found (on 3rd outboard in 12 months) once you have one it easy to sell and but another until you get your set up right, although I do get abuse from the wife when dumping another outboard on eBay that I have used twice
Happy fishing
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Old 15 May 2015, 03:22   #8
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My little mariner 2hp 2stroke would push my heavy avon rover 3.1 with 2 very large adults and 1 not quite so large adult at 5mph in slack water.
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Old 15 May 2015, 04:34   #9
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Yup.. that sound about right Blootac.



Here is more proof of them being of adequate size in calmer waters without strong tides.. my 3.3hp will happly move a 4.3m sib weighing 108 kg + 52 kg outboard + 50 kg of luggage + 100 kg of skipper .. around 4 or 5 mph too.





Mick.. I cant say for sure as I donít know your setup..but I would think the issue you had with the SIBís nose being down..was more a trim issue than an engine power problem ?..but I could be wrong. Keep all weight in the back.. have the engine set in the right angle ..and the nose will rise..even with a 2hp engine



However I do agree that smaller SIBs are kind of ď wet boats ď..regardless the engine size.
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Old 15 May 2015, 09:41   #10
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interesting, as I have a little british seagull 2/3hp engine I will be using to try the boat out with when I have it ready. I've been wondering how well it will push it along
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