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Offset drive in narrow beam boat

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Old 01-14-2006, 05:44 AM
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Default Offset drive in narrow beam boat

Was told that if I offset the drive placement in my 7' beam boat it would help the boat stay more level under power. It kind of makes sense, but I would like some feedback. Boat is a 27 Excalibur, BBC and XR Bravo. The object is to try and keep the boat level without dragging a trimtab all the time.

Cheers,

Andy
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Old 01-14-2006, 01:58 PM
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Default Re: Offset drive in narrow beam boat

Joe Shaldenbrad of Sunsation Boats offset the engine in his 24 ft. Rockets and Aggressors about 3/4 inch to help compensate for propeller torque.
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Old 01-14-2006, 02:41 PM
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Default Re: Offset drive in narrow beam boat

I don't think there is an offset on my boat. I never measured or heard anybody mention it. The only time my boat leans to the left is at FULL DOWN trim. When I come on plane it leans but as soon as I give it a little trim it levels right out.
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Old 01-14-2006, 03:46 PM
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Default Re: Offset drive in narrow beam boat

Since it is a bravo, try running a left hand prop instead. It counters the torque. I have done it before, and have seen Fountains the same way.
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Old 01-14-2006, 04:18 PM
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Default Re: Offset drive in narrow beam boat

Originally Posted by PPlay33
Since it is a bravo, try running a left hand prop instead. It counters the torque. I have done it before, and have seen Fountains the same way.
As long as your engine is Std. rotation BBC a right hand prop turns the opposite of the motor, not a left hand.

Last edited by benspeed; 01-14-2006 at 04:19 PM. Reason: spelling
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Old 01-14-2006, 04:47 PM
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Default Re: Offset drive in narrow beam boat

Originally Posted by benspeed
As long as your engine is Std. rotation BBC a right hand prop turns the opposite of the motor, not a left hand.


lefty props do in fact oppose the engine rotational torqueon single engine application's. i have tested this on many small vee's with slight to very good results depending on h.p/ torque. you may also want to play with # of blades and diameter.
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Old 01-14-2006, 05:05 PM
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Default Re: Offset drive in narrow beam boat

Wouldn't running a left handed prop just make the boat torque roll in the opposite direction?
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Old 01-14-2006, 07:09 PM
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Default Re: Offset drive in narrow beam boat

No Boat; YES
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Old 01-14-2006, 07:51 PM
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Default Re: Offset drive in narrow beam boat

Center the drive and remount batteries or other things to make the boat run more level.
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Old 01-16-2006, 03:40 AM
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Default Re: Offset drive in narrow beam boat

Thanks for the comments. I'm leaning to the 3/4 offset. Will have to look into that a little more before I cut the hole.

Thanks,

Andy
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