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Martin Birkhoff
Hi Scott,
all boats are subject to warping when they are put on the hardstand or back in the water, regardless of the construction material (GRP, wood, aluminium, steel), including Amel's. But there is a difference between conventional shaft drive and the C-Drive which Amel did build for several years.
With conventional systems it is always necessary to carry out the final alignment of shaft and shaft coupling in the water. The different loads on the hull in the water or on the hardstand cause too much deformation of the hull. Modern flexible couplings allow an inaccuracy of around 2°, but you should align as perfectly as possible.
The only exceptions are conventional shaft systems that have an integrated cardan joint. But this is a different topic.
The decisive feature of the Amel 54 is that the engine, the engine gearbox and the first (upper) direction-changing gear of the C-Drive are mounted on a common mounting frame. They thus form a self-contained, isolated unit. Alignment takes place within this closed system. The frame is flexibly mounted. This means that hull deformations will not have a direct effect. In my opinion, both of these factors reliably exclude the possibility that a deformation of the hull can have an influence on the adjustment of the drive.
Another advantage is the short distance between the shaft coupling and the motor gearbox. This also minimises any potential effect of hull deforming.
We took out the engine of our 54 in 2017, overhauled the engine and re-galvanised the frame. The complete reassembly and adjustment took place on the hardstand. No problems so far.
Martin
Mago del Sur - 54#40
currently Almerimar, Spain
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Giovanni TESTA
Well to know, Ian, many thanks and Merry
Christmas
Gianni
https://www.youtube.com/@eutikia1
Hi
Giovanni,
At
the Basimapokoulos Shipyard in Kilada in the Peloppenese. The
chief mechanic there is Dimitris. Not cheap, but excellent.
The
yard has no marina, just a large travellift and about 600
yachts ahsore.
Ian
Hi Jan, where in Greece, name? Cheers
Giovanni Testa
Eutikia sm 428 _ Preveza G R
Hi Scott ,
It can be done ashore if you are
lucky enough to find an exceptional mechanic . We
found one in Greece . We had had a small amount
of vibration between 1500 and 1900 revs . He
eliminated it without using the alignment tool .
Luck ? We’ll never know ( but he is
highly competent )
Ian and Judy , Pen Azen , SM 302 ,
Kilada, Greece
Hi all,
We are replacing our motor mounts and have heard
conflicting information as to whether you can do it
while on the hard.
Some have stated that we need to be in the water to
ensure that the hull has settled into the correct, water
loaded shape. Any thoughts?
Yes, we have the alignment tool. (Thanks Raul!)
--
Scott
2007 A54 #69
SV Tengah
http://www.svtengah.com
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ianjenkins1946 <ianjudyjenkins@hotmail.com>
Hi Giovanni,
At the Basimapokoulos Shipyard in Kilada in the Peloppenese. The chief
mechanic there is Dimitris. Not cheap, but excellent.
The yard has no marina, just a large travellift and about 600 yachts ahsore.
Ian
toggle quoted message
Show quoted text
From: main@AmelYachtOwners.groups.io <main@AmelYachtOwners.groups.io> on behalf of Giovanni TESTA <giovannitesta53@...>
Sent: 15 December 2022 14:20
To: AMEL GROUP <main@amelyachtowners.groups.io>
Subject: Re: [AmelYachtOwners] Aligning engine on the hard?
Hi Jan, where in Greece, name? Cheers
Giovanni Testa
Eutikia sm 428 _ Preveza G R
Hi Scott ,
It can be done ashore if you are lucky enough to find an exceptional mechanic . We found one in Greece . We had had a small amount of vibration between 1500 and 1900 revs . He eliminated it without using the alignment tool .
Luck ? We’ll never know ( but he is highly competent )
Ian and Judy , Pen Azen , SM 302 , Kilada, Greece
Hi all,
We are replacing our motor mounts and have heard conflicting information as to whether you can do it while on the hard.
Some have stated that we need to be in the water to ensure that the hull has settled into the correct, water loaded shape. Any thoughts?
Yes, we have the alignment tool. (Thanks Raul!)
--
Scott
2007 A54 #69
SV Tengah
http://www.svtengah.com
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Giovanni TESTA
Hi Jan, where in Greece, name? Cheers Giovanni Testa Eutikia sm 428 _ Preveza G R
Hi Scott ,
It can be done ashore if you are lucky enough to find an exceptional mechanic . We found one in Greece . We had had a small amount of vibration between 1500 and 1900 revs . He eliminated it without using the alignment tool .
Luck ? We’ll never know ( but he is highly competent )
Ian and Judy , Pen Azen , SM 302 , Kilada, Greece
Hi all,
We are replacing our motor mounts and have heard conflicting information as to whether you can do it while on the hard.
Some have stated that we need to be in the water to ensure that the hull has settled into the correct, water loaded shape. Any thoughts?
Yes, we have the alignment tool. (Thanks Raul!)
--
Scott
2007 A54 #69
SV Tengah
http://www.svtengah.com
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Scott, While the ideal would be to do it in the water, I wouldn't hesitate to do this job on the hard. An Amel is NOT a flexible boat (unlike some others I could name...). Bill Kinney SM160, HarmonieLe Marin, Martinique http://www.cruisingconsulting.com
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Nick Newington
One last thought. You want to align the engine with the rigging fully tensioned for obvious reasons.
Scott,
Not sure you will get a definitive answer; but I think that the 54 is not going to move much. Lots of bulkheads all glassed in. C drive fixed flexibly to the aft end of the keel.
Clearly there will be some movement, between being ashore and afloat but that will be less than motor sailing upwind, crashing into waves. The hull will for sure flex motoring into 25 knots of wind. Cast your mind back to such a moment. Was there any vibration that you could discern over the ambient crashing?
I would go ahead and align ashore if it is convenient to do so. Then I would check when afloat, listen for vibration at different rpm. If it ain’t right you will feel it.
I would also suggest that the C drive is actually quite forgiving. There is some flex on that bolt with the rubber by the keel. If you push/pull the prop whilst ashore you can get a mm or two of movement as per the design. Flexible mounts are also forgiving. If you are heeled over and motor sailing the engine weight alone will pull on the alignment..again this is as per designed.
My view is that the mantra to not align engines ashore comes from the days of wooden boats and hardwood mounts. My first boat was like that….solid teak blocks and bolts set onto a steel frame, prop shaft with stern tube and cutlass bearings inboard and aft. Alignment was spot on, no movement at all but any vibration would be transmitted to the hull…..you would have to adjust the alignment spot on or it would be hell….
Nick
S/Y Amelia Aml 54-019
Hi Scott , It can be done ashore if you are lucky enough to find an exceptional mechanic . We found one in Greece . We had had a small amount of vibration between 1500 and 1900 revs . He eliminated it without using the alignment tool . Luck ? We’ll never know ( but he is highly competent )
Ian and Judy , Pen Azen , SM 302 , Kilada, Greece
Hi all, We are replacing our motor mounts and have heard conflicting information as to whether you can do it while on the hard. Some have stated that we need to be in the water to ensure that the hull has settled into the correct, water loaded shape. Any thoughts? Yes, we have the alignment tool. (Thanks Raul!) -- Scott 2007 A54 #69 SV Tengah http://www.svtengah.com
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Nick Newington
Scott,
Not sure you will get a definitive answer; but I think that the 54 is not going to move much. Lots of bulkheads all glassed in. C drive fixed flexibly to the aft end of the keel.
Clearly there will be some movement, between being ashore and afloat but that will be less than motor sailing upwind, crashing into waves. The hull will for sure flex motoring into 25 knots of wind. Cast your mind back to such a moment. Was there any vibration that you could discern over the ambient crashing?
I would go ahead and align ashore if it is convenient to do so. Then I would check when afloat, listen for vibration at different rpm. If it ain’t right you will feel it.
I would also suggest that the C drive is actually quite forgiving. There is some flex on that bolt with the rubber by the keel. If you push/pull the prop whilst ashore you can get a mm or two of movement as per the design. Flexible mounts are also forgiving. If you are heeled over and motor sailing the engine weight alone will pull on the alignment..again this is as per designed.
My view is that the mantra to not align engines ashore comes from the days of wooden boats and hardwood mounts. My first boat was like that….solid teak blocks and bolts set onto a steel frame, prop shaft with stern tube and cutlass bearings inboard and aft. Alignment was spot on, no movement at all but any vibration would be transmitted to the hull…..you would have to adjust the alignment spot on or it would be hell….
Nick
S/Y Amelia Aml 54-019
Hi Scott ,
It can be done ashore if you are lucky enough to find an exceptional mechanic . We found one in Greece . We had had a small amount of vibration between 1500 and 1900 revs . He eliminated it without using the alignment tool .
Luck ? We’ll never know ( but he is highly competent )
Ian and Judy , Pen Azen , SM 302 , Kilada, Greece
Hi all,
We are replacing our motor mounts and have heard conflicting information as to whether you can do it while on the hard.
Some have stated that we need to be in the water to ensure that the hull has settled into the correct, water loaded shape. Any thoughts?
Yes, we have the alignment tool. (Thanks Raul!)
--
Scott
2007 A54 #69
SV Tengah
http://www.svtengah.com
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|
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ianjenkins1946 <ianjudyjenkins@hotmail.com>
Hi Scott ,
It can be done ashore if you are lucky enough to find an exceptional mechanic . We found one in Greece . We had had a small amount of vibration between 1500 and 1900 revs . He eliminated it without using the alignment tool .
Luck ? We’ll never know ( but he is highly competent )
Ian and Judy , Pen Azen , SM 302 , Kilada, Greece
toggle quoted message
Show quoted text
From: main@AmelYachtOwners.groups.io <main@AmelYachtOwners.groups.io> on behalf of Scott SV Tengah <Scott.nguyen@...>
Sent: Thursday, December 15, 2022 11:42:17 AM
To: main@AmelYachtOwners.groups.io <main@AmelYachtOwners.groups.io>
Subject: [AmelYachtOwners] Aligning engine on the hard?
Hi all,
We are replacing our motor mounts and have heard conflicting information as to whether you can do it while on the hard.
Some have stated that we need to be in the water to ensure that the hull has settled into the correct, water loaded shape. Any thoughts?
Yes, we have the alignment tool. (Thanks Raul!)
--
Scott
2007 A54 #69
SV Tengah
http://www.svtengah.com
|
|
|
Hi all, We are replacing our motor mounts and have heard conflicting information as to whether you can do it while on the hard. Some have stated that we need to be in the water to ensure that the hull has settled into the correct, water loaded shape. Any thoughts? Yes, we have the alignment tool. (Thanks Raul!) -- Scott 2007 A54 #69 SV Tengah http://www.svtengah.com
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