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Old 11-11-2014, 23:39   #61
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Re: New boat pulls to starboard under power, prop?

Well I have opted for a new design propeller from:

Axiom Propellers Ltd :: Yachts

On the basis of do one change at a time starting with the simplest least destructive.

Axiom's designer is very confident it will go along way to solving the issue as the wash off this design is even all around the prop unlike traditional screws which push water from different quadrants in differing quantities....

As its a left handed prop they are having to make a special up for me and its under way now and I hope to able to try it in 4-6 weeks time. We can get prolonged NE winds after Christmas which from Brighton means flats seas and nothing else around to crash into:
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Old 22-11-2014, 19:38   #62
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Re: New boat pulls to starboard under power, prop?

Dude, that's a big wheel. I think you're experiencing transverse thrust. I'm guessing you experience it most when throttling up or in confused seas?
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Old 23-11-2014, 07:20   #63
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Re: New boat pulls to starboard under power, prop?

Well yes, it is more notieable in confused seas but to honest, thats pretty much all I have been out in since I bought her.


It does kick on throttling up, on the way from tickover it kicks quickly to port at a little over 1/4 thrust, briefly then 1/2 an upwards it increases incrementally to starboard. In confused seas it caused no end of problems, given also teh autohelm failed so was more noticeable.

As I have posted, am going to try out a new style of prop and also am fitting a linear hydraulic Raymarine arm with 660kgs thrust, so with that installed and given I rarely use the wheel in real life, apart from mooring, smaller redesigned prop, hopefuly am sorted.....

What is it you think it is exactly.....
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Old 23-11-2014, 07:33   #64
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Re: New boat pulls to starboard under power, prop?

It's just the size of your prop. Its not a big deal, aside from the fact you Need to buy a new auto.

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Old 05-03-2015, 12:19   #65
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Re: New boat pulls to starboard under power, prop?

Problem solved, boat now goes completely straight under power without and hand on the wheel.

I did 2 things and I am not sure which one has worked as hauling the boat out several times is too expensive however:

1st I ordered a new type of propeller from Axiom Propellers Ltd :: home and the director advised a 24" left handed (as before) and offered a money back guarantee it would solve the issue. Can't get much better than that.) It seemed very low cost and as he may have thought solving my problem was worth a low price as his main market for these is narrow boat, presently.) I am keeping this to myself as reporting teh success as the unwritten side of my deal with him.

2nd, when the boat was hauled a local marine engineer, Mike West from West Marine Brighton, noticed that the prop was 7 inches from the back edge of the P bracket (ie: far too far away) and the cutlass bearing was shot, presumably from the vibration, although this was not noticeable before.

There was an alternator fitted to the shaft with a sort of universal joint as the engine is not totally aligned with shaft tube. It looked like the alternator may have been an after thought and when the boat was built the builder possibly mounted every thing, saw teh problem and thought fxxkit, I'll just leave this like this and hoe no one notices.

Anyway, the original prop top blade was only 5 inches from the top of the semi balanced rudder and was the flow was pushing the rudder over under power.

Mick West's engineer managed to grind off 4.5 inches of shaft inside the boat without dropping the rudder and re attach the shaft alternator et al..

And bugger me, today, I motored round the marina and it completely worked.....Phew!!!

to be honest, or dishonest more like it, if it had not worked I was going to sell the boat...as it was so annoying the pull to starboard I would have constantly hated it..
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Old 05-03-2015, 12:26   #66
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Re: New boat pulls to starboard under power, prop?

Quote:
Originally Posted by brightontrader View Post
Problem solved, boat now goes completely straight under power without and hand on the wheel.

I did 2 things and I am not sure which one has worked as hauling the boat out several times is too expensive however:

1st I ordered a new type of propeller from Axiom Propellers Ltd :: home and the director advised a 24" left handed (as before) and offered a money back guarantee it would solve the issue. Can't get much better than that.) It seemed very low cost and as he may have thought solving my problem was worth a low price as his main market for these is narrow boat, presently.) I am keeping this to myself as reporting teh success as the unwritten side of my deal with him.

2nd, when the boat was hauled a local marine engineer, Mike West from West Marine Brighton, noticed that the prop was 7 inches from the back edge of the P bracket (ie: far too far away) and the cutlass bearing was shot, presumably from the vibration, although this was not noticeable before.

There was an alternator fitted to the shaft with a sort of universal joint as the engine is not totally aligned with shaft tube. It looked like the alternator may have been an after thought and when the boat was built the builder possibly mounted every thing, saw teh problem and thought fxxkit, I'll just leave this like this and hoe no one notices.

Anyway, the original prop top blade was only 5 inches from the top of the semi balanced rudder and was the flow was pushing the rudder over under power.

Mick West's engineer managed to grind off 4.5 inches of shaft inside the boat without dropping the rudder and re attach the shaft alternator et al..

And bugger me, today, I motored round the marina and it completely worked.....Phew!!!

to be honest, or dishonest more like it, if it had not worked I was going to sell the boat...as it was so annoying the pull to starboard I would have constantly hated it..
Thanks for the feedback. I had forgotten about it.

I'm tickled to death it is resolved.
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