Off set

[tom020780]

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

[Mollers]

Wow! 150 on 5.5m, what's it rated at?

[tom020780]

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

[tom020780]

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

[Pikey Dave]

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.......

[tom020780]

Pikey dave

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

[Robbie Diesel]

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!

[tom020780]

Thanks