OCEAN PRO 6.30 leaning on port side

[Hogg]

hello,
I am the proud owner of a Humber OCEAN PRO 6.30 (great boat).
But I have a problem with making the navigation very uncomfortable, even dangerous.
The boat leans a lot to the port side when sailing.
The engine is an Evinrude 150H0 installed in the axis with a 3 blade propeller.

By replacing the 3-blade propeller with a 4-blade propeller, the phenomenon is slightly reduced

What should be done to correct this problem?

Thank you in advance for your comments

[beamishken]

Originally Posted by Hogg

hello,
I am the proud owner of a Humber OCEAN PRO 6.30 (great boat).
But I have a problem with making the navigation very uncomfortable, even dangerous.
The boat leans a lot to the port side when sailing.
The engine is an Evinrude 150H0 installed in the axis with a 3 blade propeller.

By replacing the 3-blade propeller with a 4-blade propeller, the phenomenon is slightly reduced

What should be done to correct this problem?

Thank you in advance for your comments

What height is the engine in relation to the hull? Does the situation improve with trim?
Have you looked at the weight distribution?
Usually something to do with setup

[Hogg]

Originally Posted by beamishken

What height is the engine in relation to the hull? Does the situation improve with trim?
Have you looked at the weight distribution?
Usually something to do with setup

I tried in navigation to distribute the weights in different places and nothing, always this phenomenon.

The battery is located on the starboard side.

For the height of the engine, I will send you a photo as soon as I am in front of the boat.

I have read a lot that it is desirable to shift the engine to starboard to correct the left leaning

[GuyC]

Is there an adjustable trim tab on the outboard that can be changed to counteract the torque effect of the propeller?

[whiskylee]

Good call guy c ref trim anode

Picture of the cavitation plate in relation to the bottom of the hull, engine height can change the handling

Try all the easy changes first especially the trim anode [emoji106]

[Mikefule]

Just based on the brief description, is the engine sitting too low on the transom? If the prop is too deep then there will be extra leverage on the torque of the prop.

[beamishken]

Originally Posted by Hogg

I tried in navigation to distribute the weights in different places and nothing, always this phenomenon.

The battery is located on the starboard side.

For the height of the engine, I will send you a photo as soon as I am in front of the boat.

I have read a lot that it is desirable to shift the engine to starboard to correct the left leaning

Being overpropped can also cause it as can incorrect trim & or the adjustable trim tab above the prop. What it your wide open throttle rpm? And does it improve as you trim out?

[jwalker]

You're always going to have a torque reaction to the prop on a single engine which is trying to list the hull. The best you can do is try to introduce balancing forces, position of boat items, console, engine, crew, batteries etc. Also be sure there is no steering action when running straight ahead because steering pressure will list the boat, so engine setup is important and under water parts must be straight. However, having said that, if you've got a static list it may be possible to introduce a corrective force by adjusting the engine so that you steer a little to counter the list when under way.

If you find it insurmountable trim tabs are your answer.

[Limecc]

Originally Posted by jwalker

You're always going to have a torque reaction to the prop on a single engine which is trying to list the hull. The best you can do is try to introduce balancing forces

Would a left hand rotation prop correct the problem or make it worse?
Always wondered how this is achieved.

[jwalker]

Originally Posted by Limecc

Would a left hand rotation prop correct the problem or make it worse?
Always wondered how this is achieved.

If the boat is otherwise balanced, it would simply list to the other side.

Every action has an equal and opposite reaction; a right-hand prop is turning clockwise viewed from the rear so the reaction force is opposite, ie. anti-clockwise. Similarly, a left-hand prop is turning anti-clockwise so the reaction force is clockwise.

This rule doesn't only apply to rotational forces; eg, while you are standing on the ground the mass of your body is creating a downward force on the ground equal to your weight, the ground is pushing upwards with an equal and opposite force. If this wasn't true, you'd sink into the ground!

[GuyC]

Originally Posted by Limecc

Would a left hand rotation prop correct the problem or make it worse?
Always wondered how this is achieved.

Pac 22's have left handed props and heel to starboard but it's no worse.

[beamishken]

Originally Posted by Limecc

Would a left hand rotation prop correct the problem or make it worse?
Always wondered how this is achieved.

Only possible if you replace the gearbox first as you cant just run a rh gearbox in reverse to run a lh prop.
Your overthinking this, check the setup & report back before you do anything it may be as simple as lifting the engine a hole or two or moving the trim limit pin out a few holes.
Determine the height of the av plate in relation to the hull find out your wot rpm & take notice if the situation improves by trimming out.
Check the simple things first

[CJL]

Firstly it is common practice to move the engine mounting off the centre line on large single engine boats.

If this hasn't been done at installation and you are not able to retrospectively do it then have a play with the little anode skeg under the cavitation plate.

Then try off setting weight in the boat.

If that doesn't sort it then have a play with trim tabs but remember they often just tell the world that your outboard wasn't fitted right!

CJL