lean to port and Chinewalking on a Humber Ocean Pro 6.3

[beerbelly]

Originally Posted by Limecc

I recall you have a Mercury Spitfire prop:


And performance is pretty much expected:
115hp efi only 36 knots

It must have been ventilating raised 1.1/2" before fitting the four blade? Did you drop it two holes or one?

Lifeboatman is doing the right thing raising his.

i dropped it one hole its now on its lowest possible setting

[69cmw]

Originally Posted by beerbelly

i dropped it one hole its now on its lowest possible setting

Beer, mine is 1 hole up, I found that the best position.

[lifeboatman3]

Originally Posted by mikehhogg

One of the most often overlooked causes of Chine Walking is play in the steering, even a tiny bit of play anywhere in the steering system at the speeds you are talking about could cause this effect.

Never thought of that! I'm using Baystar hydraulic and need to top it up just after buying it as it was slipping when turning. Might still be air in the system?

[Jon Tallis]

If the steering was slipping then you'll definitely have drawn some air in. Definitely worth bleeding it - you'll need a full and bleed kit (you can make one up from hose and fittings but they're not expensive to buy). There are several videos on YouTube showing how to do it

[whiskylee]

Originally Posted by lifeboatman3

Never thought of that! I'm using Baystar hydraulic and need to top it up just after buying it as it was slipping when turning. Might still be air in the system?

O bought this kit for my seastar, worked well to remove all the air

https://www.ebay.co.uk/itm/Tiamu-Boa...-127635-2958-0

[lifeboatman3]

Kit ordered and I will let you know how I get on

[lifeboatman3]

Originally Posted by lifeboatman3

Kit ordered and I will let you know how I get on

Done the steering quite a bit of air came out so won't know until next year when the boats back on the water

[Limecc]

Originally Posted by lifeboatman3

Done the steering quite a bit of air came out so won't know until next year when the boats back on the water

Should help with chine walking but not the lean to port

I'm going to use the search facility on this and other sites and determine which props are the worst offenders and I'll report back in due course with references.

[lifeboatman3]

Originally Posted by Limecc

Should help with chine walking but not the lean to port

I'm going to use the search facility on this and other sites and determine which props are the worst offenders and I'll report back in due course with references.

Thanks

2

[gtflash]

Mine leaned to port. With engine mounted starboard by a few inches. It looked rubbish to the side too.

Mounted in middle, lifted up higher abd moved weight to starboard and it all disappeared. It is not uncommon for boats to lean to port when trimmed in heavily. If this is the case it is possible your engine is too low and causing the port lean. Try accelerating with higher trim. I even heard a bloke at the boat show telling a new customer don’t trim in or it will lean ��

If you eliminate port lean with engine height, retake max rpm tests and grip and slip, only then play with expensive props. No point buying a new prop then realising enigine height demands a new blade and a bigger dia

I have an etec and the etec forum dudes aliken under revving as similar to driving in top gear all day long. Many etec failures attributed to this basic setup of height speed rpm prop pitch and blades

[Limecc]

Offsetting was discussed here in a 2014 thread:
Engine Offset

Interestingly some posters agree with me that any offset ought be to port, not starboard. Rotation torque of RH prop trumps moving weight of the engine starboard.

[gtflash]

Originally Posted by Limecc

Offsetting was discussed here in a 2014 thread:
Engine Offset

Interestingly some posters agree with me that any offset ought be to port, not starboard. Rotation torque of RH prop trumps moving weight of the engine starboard.

Good thread. But mounted in the middle and weight to starboard is simple enough. My battery, oil tank and helm alone offset a tetchy race spec boat that used to lean to port. Plus it looks better and might be easier than sliding an engine all over a transom.