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Old 07 October 2017, 03:13   #11
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Auxiliary outboard on SIB

Generally enough room on most larger sibs for a small auxiliary motor. Probably won’t even need a long shaft even when mounted on the higher transom sides. You might have to modify (cut) the splash flaps on your boat.
Also agree with your thoughts on 4 stroke to match main engine for ease of fuelling.
For longer coastal jaunts we would take our tiny Honda 2.3 along, stored on deck in a full padded carry bag, only to be deployed if required. Could also be transom mounted if preferred.
I think the lightest 4-strokes are the little Suzuki 2.5 & Honda 2.3 both around 13kg.

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Old 07 October 2017, 04:29   #12
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Hugely helpful, thanks all, particularly chipko for the pictures which perfectly illustrate my set up.

I'm thinking the transom flaps could be removed temporarily then chocked back with either velcro or poppers.
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Old 07 October 2017, 10:09   #13
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I've now got a little johnson 2 stroke for emergencies. It lives wrapped in some tarp under my feet in the aerotec. My aerotec has the less common long shaft transom which is flat all the qay across. If I need to use it the mariner outboard has to be shuffled along a bit before I attach the johnson. The johnson has no integral tank but I made up a hose and primer bulb for it to run off the 25l mariner tank.
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Old 08 October 2017, 01:56   #14
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Quote:
Originally Posted by Andy JC View Post
I've considered one of these as a cheap/light alternative to an auxiliary on my SIB.
What amp hour battery did you have?
Would a small 7ah battery run one and for approximately how long?
Torqeedo is a specific make and has an integral battery pack. It is not a cheap alternative. They are designed as auxiliary power for yachts and that sort of thing.

https://www.electricoutboards.eu/tra...iABEgLfS_D_BwE

You are probably thinking of one of those trolling motors that runs off a car battery.
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Old 08 October 2017, 03:51   #15
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Originally Posted by Mikefule View Post
Torqeedo is a specific make and has an integral battery pack. It is not a cheap alternative. They are designed as auxiliary power for yachts and that sort of thing.

https://www.electricoutboards.eu/tra...iABEgLfS_D_BwE

You are probably thinking of one of those trolling motors that runs off a car battery.
Ah, you are indeed correct Mike. And no, those definitely are not a cheap option!
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Old 26 February 2018, 14:27   #16
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Quote:
Originally Posted by chipko View Post
Generally enough room on most larger sibs for a small auxiliary motor. Probably won’t even need a long shaft even when mounted on the higher transom sides. You might have to modify (cut) the splash flaps on your boat.
Also agree with your thoughts on 4 stroke to match main engine for ease of fuelling.
For longer coastal jaunts we would take our tiny Honda 2.3 along, stored on deck in a full padded carry bag, only to be deployed if required. Could also be transom mounted if preferred.
I think the lightest 4-strokes are the little Suzuki 2.5 & Honda 2.3 both around 13kg.

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Hey Chipko. Looking back at this now (after buying a 3.3 2 stroke) I was just wondering what your max transom weight was on that boat, vs the weight you have on it?

I'm about 5kg over my 60kg max with the 20 and the 3.3 on, but consensus on here is that's no major issue.
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Old 26 February 2018, 14:56   #17
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Hi Nick,
Transom rated at 55kg, so at least 2kg over with the 13kg aux and 44kg main.
Usually carried the little auxiliary on deck in a padded carry bag, only to be deployed if required, so not concerned with additional weight when hooning around on the main. As only going at displacement speed on the auxiliary not too worried about exceeding the max weight stressing the transom.
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Old 26 February 2018, 15:04   #18
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Originally Posted by chipko View Post
Hi Nick,
Transom rated at 55kg, so at least 2kg over with the 13kg aux and 44kg main.
Usually carried the little auxiliary on deck in a padded carry bag, only to be deployed if required, so not concerned with additional weight when hooning around on the main. As only going at displacement speed on the auxiliary not too worried about exceeding the max weight stressing the transom.
Cheers, that echoes what everyone else is saying. Ailsa Craig this spring... Hopefully don't need to use the aux to get back from there!
N
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Old 29 March 2018, 11:06   #19
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I would go with a slim 2 stroke and a direct drive one for ultra light weight around 13kg
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