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Old 06 April 2010, 08:18   #1
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twin engine set up 135/150hp

Counter rotating engines?
Do they have to be ?
If not whats the down side?
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Old 06 April 2010, 08:34   #2
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whats the down side?
tri dis

putt sum rowler blaydes onn

owld a powirful rooter inn eech and

swich onn de aformenshund powirtewls.

sennd uz a powstcard fromm de ospitul

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Old 06 April 2010, 08:47   #3
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Counter rotating engines?
Do they have to be ?
Nope!

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Originally Posted by nugent View Post
If not whats the down side?
Torque steer.


There be arguments both ways - The CR lump will be more of a PITA to get bits for the bottom end, but then apparently you get a better ride. Whether that sort of HP induces much of the aforementioned steer and or whether just setting your trim tabs would work just as well I'll leave to the "big twins" fraternity. Certainly not an issue at twin 30/40 kind of HPs.......
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Old 06 April 2010, 09:46   #4
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Nope!



Torque steer.


There be arguments both ways - The CR lump will be more of a PITA to get bits for the bottom end, but then apparently you get a better ride. Whether that sort of HP induces much of the aforementioned steer and or whether just setting your trim tabs would work just as well I'll leave to the "big twins" fraternity. Certainly not an issue at twin 30/40 kind of HPs.......
not really wanting to mess with trim tabs either,
may be best to get the transom put back to original state and wack a 250 up its ass instead then, decisions decisions, no rush at present want it set up before the collar goes on tho..
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Old 06 April 2010, 10:45   #5
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Not too much of an issue, mine don't counter rotate but only because they don't do counter rotation on a standard shaft. You'll need decent hydraulic steering, but other than that I have not experienced any issues.

To be fair had i been able to get long shaft engines for the Arctic I would have got hem counter rotating, there wasn't much difference in price.
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Old 06 April 2010, 14:35   #6
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Not too much of an issue, mine don't counter rotate but only because they don't do counter rotation on a standard shaft. You'll need decent hydraulic steering, but other than that I have not experienced any issues.

To be fair had i been able to get long shaft engines for the Arctic I would have got hem counter rotating, there wasn't much difference in price.

sounds good then, hydro steering is there allready, it had two 115hp mercs on it hence teh reason to go back to twins, + the holes are there,

so presuming i can use em to suit with out worrying about off set,
BUT i do not know if they was counter rotating on the original install,,,,,,,
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Old 07 April 2010, 05:15   #7
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Go on, do it properly. If you can get twins, they just have to be counter rotating, anything else looks like cutting corners

I would think the overall effect would be much better - with torque reaction on a single you don't need to get much of a "twist" when most of the boat leaves the water to turn a soft landing into a hell of a bang because you land on the flat face of the hull, CR props would remove that, non CR would make it twice as bad...
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