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Boat pulls to Starboard under power

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Pride of Waterford View Drop Down
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    Posted: 07 September 2020 at 16:53
On our 2008 370 we have a yanmar SD20 saildrive and flexofold 2 blade prop.
Recently we had a blip with the autopilot turning off and the boat suddenly veered to Starboard.
We continued testing and found that under almost any power the boat pulls strongly to starboard.
Any ideas, or is this normal??
Thanks
Brod Port Lairge
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andrewlambert View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote andrewlambert Quote  Post ReplyReply Direct Link To This Post Posted: 07 September 2020 at 17:58
I have a 370 from 2007 same engine and sd20 - I also get a slight pull but  to port,  thewheel if let go gradually turns to port - my theory is the prop wash is hitting the balanced rudder in slightly unequal amounts

 I think this because the boat is perfectly bacalnced when sailing and if you look at the distance from prop to rudder it only takes a very slight angle to make noticeable impact on the rudder , also the fact that mine slightly veers to port and yours  to starboard ? Might further confirm the theory Of prop wash hitting the rudder 

Tbh it could be noNsense but I canít think of other reasons given the perfect balance under sail 

I intended to research some other forums etc to see if any other boats with similar set up experienc e the same 
Hanse 370 #237 "Ginger Bay" UK, River Hamble
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andrewlambert View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote andrewlambert Quote  Post ReplyReply Direct Link To This Post Posted: 07 September 2020 at 18:00
ps the pull to port I get is very very slight can be managed  with one finger on the wheel 
Hanse 370 #237 "Ginger Bay" UK, River Hamble
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andrewlambert View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote andrewlambert Quote  Post ReplyReply Direct Link To This Post Posted: 07 September 2020 at 18:07
 https://jeanneau.proboards.com/thread/8309/rudder-moves-when-motoring

Well after a little googling some interesting possibilities - good thread above - sail drive and shaft owners with some thoughts ! 

To me it sounds like We may not have an issue generally however yours as you say is strong in force 

I have a fixed prop not folding I wonder if that has any impact in your case 
Hanse 370 #237 "Ginger Bay" UK, River Hamble
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samuel View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote samuel Quote  Post ReplyReply Direct Link To This Post Posted: 07 September 2020 at 18:13
On my boat the pull to one side increases significantly as the coppercoat begins to foul. This is, presumably, due to the increased load on the prop, thus causing a greater reaction to prop wash. I also notice the stern digging in a little, as I have to use more throttle to compenate loss of speed.


Edited by samuel - 07 September 2020 at 18:14
Daydream Believer- Hanse 311- No GBR9917T- Bradwell Essex
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Mschesser View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mschesser Quote  Post ReplyReply Direct Link To This Post Posted: 16 September 2020 at 03:07
I also own a 2008 370 configured the same that will also veer to starboard under power, but is perfectly balanced under sail.  Imbalance in the prop wash under power is certainly the cause
M Chesser
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astarte View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote astarte Quote  Post ReplyReply Direct Link To This Post Posted: 16 September 2020 at 12:11
Hi. You should differentiate between prop wash and prop walk. The latter comes from the rotation of the propeller. In my 370 with SD50 the propeller rotates towards left when in forward resulting in the boat turns to starboard. Prop walk and prop wash is of course beneficial when turning the boat without thruster in confined areas 
Kristoffer
Hanse 370e #412
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andrewlambert View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote andrewlambert Quote  Post ReplyReply Direct Link To This Post Posted: 16 September 2020 at 20:21
Astarte 

You are right on propwalk vs propwash

This discussion has helped me work out my slight pull is due to prop walk

Great point 👍
Hanse 370 #237 "Ginger Bay" UK, River Hamble
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Captain MJ View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Captain MJ Quote  Post ReplyReply Direct Link To This Post Posted: 18 September 2020 at 04:50
Indeed it is perfectly normal... and it is caused by prop walk.

Fair winds!
-Cpt. Mark
Mark Jordan : ASA Sailing Instructor : USCG Licensed Captain : San Francisco Bay Area, California, USA
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Pride of Waterford View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Pride of Waterford Quote  Post ReplyReply Direct Link To This Post Posted: 13 October 2020 at 17:09
Many thanks for you reply.
Is the pull under power to starboard very big? Like yours she is balanced under sail.
Is there anything we can do to improve this?
Thanks
Jon
Brod Port Lairge
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