New boat new poblem

sailaboutvic

sailaboutvic

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Low rpm there no Vibration add more Rpm and you can feel the boat vibrate , in rev the boat vibrate.
I do know there play in the rudder but I wouldnt think that be the problem.
My experience with having something caught on the prop is would vibrate at any rpm .
Other then shaft bearing any other thoughts?
It only started to happen the other day so discounting engine inlinement
 
Prop would be the favourite for sure. Unless it happens when in neutral too. Unbalanced rotational machinery usually have two critical rpm areas. One at low rpm and the other at higher. Similar to an unbalanced wheel on your car. They don’t usually vibrate at all rpm…unless it’s really bad.
 
My vote is prop. If the water is clear you might be able to see the prop. If its sudden here today and not there yesterday it increases my vote on the prop - look for a plastic bag, maybe try the prop in reverse as well as forward. If the blades fold independent of each other, one blade not extended the same as the other - I thought 2 bladed Gori folded independently - but I'm probably wrong :(

If it happens in neutral - engine

Jonathan
 
Agree with the above suggestions but don't discount engine alignment. I just discovered significant misalignment after noticing more vibration at certain revs and especially when freewheeling under sail. It wasn't there 15 engine hours before.

It's relatively easy to check by disconnecting the propshaft. Realigning (and replacing the mounts for me) is also relatively straightforward.
 
Neeves said:
My vote is prop. If the water is clear you might be able to see the prop. If its sudden here today and not there yesterday it increases my vote on the prop - look for a plastic bag, maybe try the prop in reverse as well as forward. If the blades fold independent of each other, one blade not extended the same as the other - I thought 2 bladed Gori folded independently - but I'm probably wrong :(

If it happens in neutral - engine

Jonathan
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I been using reverse now and then and yesterday to keep it going ,rev back to forward and it seen to stop it for sometime
 
sailaboutvic said:
I been using reverse now and then and yesterday to keep it going ,rev back to forward and it seen to stop it for sometime
Click to expand...

We used to have the problem of polythene bags in Hong Kong. If you were quick and caught the bag and immediately went into reverse (really you need to be sitting on top of the engine controls) you could wash the bag off. Going from forward to reverse cyclically could sometimes tear the bag to shreds. If you were motoring through HK harbour you could not dive to check what the issue was so trying to remove the problem resulted in the forward reverse options. It sometimes worked.

Sadly the only foolproof way was have someone over the side with a knife (which is best accomplished in a marina or at anchor.)

Jonathan
 
sailaboutvic said:
Thanks for your input , I too through it was some thing around the prop .
The problem now if any part entered the bearing .
Click to expand...

If that red stuff was the problem then if it was tight as steel to remove it may have entered the bearing but I suspect its simply to big, even though its made of fine strand, to get into the bearing. If you have mentioned it - I missed it - but is it a sail drive. I think single strand fine fishing line is a problem but not a ball of twine like you have.

My suggestion of forward and revewrese would not have made your tangle any better - sorry - the only answer was a knife, serrated and sharp.

What amazed me was that this seemed a new issue with you, whereas coming from HK it was everyday life (it may be better there now). Your image to me as my hero was very slightly dented as you had not experienced - everything :)

Jonathan
 
That part of a nylon rope , on this boat there a rope cutter and most likely the cutter did it job but as it did part of the rope wrap around the shaft .
If it was our other boat which was a sail drive no rope cutter I'm in no doubt it would had stopped the engine .

Most experience we had with picking stuff is mostly plastic or fishing line and with. A sail drive the line would get suck into the seals , I can't count how may seals I replace over the years .
The problem here is you can't see your hand in front of you face it's so muddy , so where in the Med I would had when straight over the side , we have driven a couple of days with the problem , so I do expect that damage may have been done to the bearing .
But hey it's all in a days work, for now unless we get sign of another problem we keep sailing or should I say motoring as we in the inland waterways.

She as to come out over winter to sort out the rudder bearing and I remove and replace the bearing then if need be .
 
Neeves said:
If that red stuff was the problem then if it was tight as steel to remove it may have entered the bearing but I suspect its simply to big, even though its made of fine strand, to get into the bearing. If you have mentioned it - I missed it - but is it a sail drive. I think single strand fine fishing line is a problem but not a ball of twine like you have.

My suggestion of forward and revewrese would not have made your tangle any better - sorry - the only answer was a knife, serrated and sharp.

What amazed me was that this seemed a new issue with you, whereas coming from HK it was everyday life (it may be better there now). Your image to me as my hero was very slightly dented as you had not experienced - everything :)

Jonathan
Click to expand...
Johathen
Not only a new boat to us but a new way of life too ,
We experiencing the inland waters of the Netherlands, .( standing mast route )
with what seems like London taxi drives who got their hands on enormous barges Without a minute to lost .
It's Our six day to day,, 65 miles under our belt with probity no more then 5 of them miles under sail
With fuel at €2.10 a lts we trying to pick up as much current we can .
And so far 19 bridges and locks navigated
We managed to anchor two nights out of five ,
can you feel my pain ?
Luckily marina fees are not med prices ,
Although €17 a night to someone who use to anchoring 9 months a year is still painful .
You really don't what to have a problem where you having got any forward drive in these waters, you can't just drop your hook .
But hey we enjoying a slowly pace for now .
Now with the prop problem removed , and the unknown problem is now known , hoping for a less stressful day .
Life goes on .
 
Vic it sounds as if you are on the cusp of a new learning experience. I tell myself all these challenges of learning new skills might keep my brain active - think of yourself as a recycled 20 something.

I'm not sure how best to address the new cost structure for diesel - its not something for which I was prepared, either.

Take care, stay safe - keep us updated

Jonathan
 
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