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Old 13 September 2006, 10:44   #1
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Country: UK - England
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Rib leaning during power up

Have noticed that the rib leans to the left when i excelerate. Is there an adjustment for this?

Chris B
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Old 13 September 2006, 12:08   #2
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What's your setup - seating, etc ?

Applying power will highlight any poor weight distribution issues.

Alternatively (assuming you're running an outboard not inboard) check the alignments of the steering.

And check tube inflation on the aft quarter opposite to the direction of pull.

Hope this helps.
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Old 13 September 2006, 14:26   #3
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What you are experiencing is paddle wheel effect or propwalk - similar to torque steer on a car.

heres all about it as its too long for me to explain...

http://en.wikipedia.org/wiki/Propeller_walk

Two engines sort your problem out - as does duoprops (I think invented as it is now by Volvopenta - not 100% sure tho) - but it was originally invented to keep tordepos straight so they hit their target in the water!! - Basically a set of contra-rotating props on one outdrive shaft counteract the prop kick and keep the boat straight...

heres about duprops...

http://www.marinepartsexpress.com/promo/duoprop.html

Any boat with one engine and one prop will propwalk - sometimes (in mooring up) you use it to your advantage - other times, when trying to get the stern in its a right bas**rd!

Hope this helps!

Regards

Chris
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Old 13 September 2006, 14:45   #4
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Try trim tabs.
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Old 13 September 2006, 14:51   #5
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Thanks for the info.

I have only had the rib a few months. Its a Humber 6.3mtr Ocean Pro with a 150 Evinrude 2 Stroke.

Does this mean my combination is wrong and i may not be able to sort it?

Chris
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Old 13 September 2006, 15:09   #6
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nooo, it doesn't mean anything! - as above trim tabs will probably help - try some smart tabs maybe? (they are activated by preasure from the water pushing up, so one will dig in further than the other) - but it is totally natural reaction from the boat!
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Old 13 September 2006, 15:33   #7
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It is perfectly normal. Most people soon get used to it but if you have a very pronounced lean then you could try trim tabs. For a boat your size the new Volvo QLs would be great - the easiest to fit quite cheap. I have a pair but haven't fitted them yet!!!

http://www.foreandaftmarine.com/VO-QL3841717.htm

Most British Volvo dealers can order for you but most have never heard of them!!!

Obviously to counteract lean you use the tab on one side more than the other but extra drag will slow you down.
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Old 13 September 2006, 16:01   #8
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Do most boats suffer from this then? I just ask as my Humber doesn't seem to at all. From a standing (floating?) start you can open the throttle to WOT and accelerate to full speed and you don't need any steering input worth mentioning as the speed rises, and nor does the boat seem to lean at all, not even a little bit. I've been in other boats though, that feel like they are going to sink when you open up the taps. Am I just lucky? No trim tabs or bling props or anything... just an ordinary eggwhisk on the back spinning a bog standard prop.
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Old 13 September 2006, 16:05   #9
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Is your engine off set and if so by how much
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Old 13 September 2006, 16:33   #10
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Quote:
Originally Posted by BogMonster
Do most boats suffer from this then? I just ask as my Humber doesn't seem to at all. From a standing (floating?) start you can open the throttle to WOT and accelerate to full speed and you don't need any steering input worth mentioning as the speed rises, and nor does the boat seem to lean at all, not even a little bit. I've been in other boats though, that feel like they are going to sink when you open up the taps. Am I just lucky? No trim tabs or bling props or anything... just an ordinary eggwhisk on the back spinning a bog standard prop.
My boat seems the same.
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