julians
Well-Known Member
You need to get hold of the detailed service invoice and see if the bellows were replaced recently or not
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Survey/sea trial
- Thread starter Martxer
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Seastoke
Well-Known Member
But if it was serviced 5 months ago and the boat is a 2020 , it might have been just over a year old ,so why would they change the bellows. I bet the surveyor puts that on every outdrive survey.
rafiki_
Well-Known Member
Before any sea trial the boat should be lifted and the hull and sterngear cleaned. In warm and sunny weather, white worm casts attach to the outdrive/props and knock off a lot of speed. My Azimut could easily lose 10 knots with worm casts on the props, this growth taking 2 weeks in high summer.
SC35
Well-Known Member
The lower exhaust bellows really don't matter that much, they even have a hole in for drain purposes and spend most of their life full of water.
The upper UJ bellows are an entirely different kettle of fish. Even a small amount of water in there can destroy the UJ or the upper bearing set.
The upper UJ bellows are an entirely different kettle of fish. Even a small amount of water in there can destroy the UJ or the upper bearing set.
jointventureII
Well-Known Member
I was always under the belief that the boat should reach within 5% of max commissioning test speed? (minus a bit for load etc if applicable). This is something that the vendors side should deal with, you won't get any accurate info if the boat is fouled to any significant degree.
Elessar
Well-Known Member
So let me get this straight.
You’ve had an out of the water survey and a sea trial?
Yet you did the sea trial first?
You should have had the out of water survey first and had it jet washed.
And the surveyor didn’t advise this or advise it could be responsible for the speed loss?
I’m surprised it’s only down by that amount if it’s not been out since March. It’s been a hot summer remember.
I’d be concerned about the surveyor rather than the boat.
Martxer
Well-Known Member
The broker arranged the sea trail boat lift and survey around when he could get the boat lifted.
It would have made sense to have done the sea trail last.
Seastoke
Well-Known Member
Well remember the sea trial should be the fastest you get it , as after that it will be full of your kit ,water and fuel . If it was me I would ask for the Trims to be fixed get a jet wash then sea trial again . The bellows are your problem .
petem
Well-Known Member
I honestly think you have three non-issues here.
1) A 5 knot loss of performance over a hot summer is perfectly normal. Remember that other factors can affect performance - wind, sea state, amount of crew / cruising / fuel / water gear on board, outdrive trim, etc.
2) The bellows not having been replaced sounds like it was a simple error or the boat perhaps not being two full years old and the dealer taking the service schedule a bit literally.
3) Trim tabs not working could be anything. Just ask the vendor to fix them (could be something as simple as a blown fuse). No big deal.
1) A 5 knot loss of performance over a hot summer is perfectly normal. Remember that other factors can affect performance - wind, sea state, amount of crew / cruising / fuel / water gear on board, outdrive trim, etc.
2) The bellows not having been replaced sounds like it was a simple error or the boat perhaps not being two full years old and the dealer taking the service schedule a bit literally.
3) Trim tabs not working could be anything. Just ask the vendor to fix them (could be something as simple as a blown fuse). No big deal.
Elessar
Well-Known Member
Absolutely. Get another sea trial. That will put your mind at rest. Or not of course. But a boat under warrantee sounds good to me.
volvopaul
Well-Known Member
You have not said what type or model of boat this is though I think I can guess.
2 xD4 300 is ridiculously small for a 40 ft boat that you are going to expect to perfo as it says in the sales brochure or what the broker claims in the speel.
400 rpm down is a high margin because it will reduce your cruise speed even further because you cannot use what it will attain which is 3100 , you will only be able to run it all day at 2900 which may place it at the spot where it’s trying to climb it’s own trough .
So did you have an engineer on board , I find surveyors know very little about engines and drives to give the correct advice, Im guessing no that’s why your on here .
Typical broker saying it’s weed when you must have carried out the sea tria, after it was lifted for hull and drive inspection .
Martxer
Well-Known Member
I have spoken with the broker this morning, he is going to sea trail again tomorrow and video for me.He has also contacted the engineer about the bellows.?
Having owned an outboard boat I have not experienced the loss in performance due to growth.
Having owned an outboard boat I have not experienced the loss in performance due to growth.
Martxer
Well-Known Member
Had a Volvo engineer on board he said the lack of revs/speed was due to bring dirty
volvopaul
Well-Known Member
Did he have the vodia plugged in to read the data and see what percentage load was on each engine in relation to throttle position to deduce it’s hull growth , was the sea trial after lift out ?
prinex
Well-Known Member
I thinks this is the issue anyway, once you put 5-6 people full water / fuel etc and start hitting a few waves going the wrong way, the boat will have troubles to keep the plane. On my boat (41 foot 7tons 2xDP360) super-clean hull fully loaded (10 people on board) I need to run around 3000 rpm at 27kn to "feel" that the boat is confortable in the water (you can also "hear" from the engine room that everything is ok), not "braking" when we hits a wave etc.
Take 6 people off and same rpm and we are at 30kn already. WOT is 3300 rpm and we did this when I bought it, we where flying at 34/35 kn in choppy waves.
Point is that boat may be underpowered anyway and not "fun" to drive.
petem
Well-Known Member
There are loads of 40ft sportcruisers out there with 260-300hp a side (e.g. Targa 40's). Whilst not the fastest boats, I don't hear the owners complaining about the performance.
And everything is a compromise. Bigger engines will be heavier, more expensive to service and will have less room around them for servicing.
And everything is a compromise. Bigger engines will be heavier, more expensive to service and will have less room around them for servicing.
jrudge
Well-Known Member
I have to agree with Pete. I have a t40 with twin 260 hp as I recall and it did close to 35 kts.
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Seastoke
Well-Known Member
Well I would be there for the sea trial, you could drive , you will know the sea state and the big one , if you like it . Ps put some effort in it’s a lot of money.
Martxer
Well-Known Member
Sea trail was after lift out he plugged into one engine took the data from a run then plugged into the other on the way back, everything was reading as it should just not making WOT
Martxer
Well-Known Member
I am putting the effort in drove 250 miles none stop to make the last trail, I will see if a re run can be arranged for when Ican make it down again ?
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