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Old 20 June 2015, 11:02   #1
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Country: UK - England
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Boat name: Bondage
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Ok I have stripped 2 x 60hp off the back of a tornado 5.5 and got a 150 optimax arriving during the week.

Question here is when installing the lump how much offset should I mount the single with?

Look forward to replies
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Old 20 June 2015, 11:11   #2
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Wow! 150 on 5.5m, what's it rated at?
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Old 20 June 2015, 11:18   #3
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190kgs is max weight the twins were 90kgs each so going up 7kgs in weight.

It's the older type early 90's so built a little more heavy duty

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Old 20 June 2015, 11:22   #4
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Have seen quite a few running 125hp and one other with a 150 e-Tec was quite lively if you wanted it to be - he is 3 years in running total 280 hours in most conditions no issues to date, sat nicely on the morning and under load.

I've got a 150l tank under the console couple of large batteries, anchor etc so quite a bit of weight forward
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Old 20 June 2015, 12:32   #5
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Just as a pointer, I'm running a very beamy 5.45 with a 140 & it's offset by 40mm. The engine has a 21" prop & until I raised the engine 2 holes she landed heavily on her port side. She now comes down neutrally. I also have 170l tank, twin batteries, anchor, 25kg sand etc.
I'd have thought you would be running a 21-23" prop which is a lot of torque to counteract for a relatively small hull. I'd say 1.5" minimum, possibly 2" offset.


.....sh1t happens.......
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Old 20 June 2015, 12:58   #6
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Thanks for that the boat is very beamy thinking that weight wise it's pretty much a direct swap but obviously a "little" more grunt

2" sound like a plan
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Old 20 June 2015, 13:45   #7
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1" per 100hp is what I was told by a boat builder. So 1.5" offset for your 150hp


That boat looks like it would handle a 150 no probs!
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Old 20 June 2015, 14:31   #8
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Thanks
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