Questions about an extended motoryacht

Discussion in 'Boat Design' started by Bornyesterday, Mar 8, 2021.

  1. Bornyesterday
    Joined: Aug 2020
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    Bornyesterday Junior Member

    A boat that I am looking at is a 85 foot steel canoe stern motor yacht. It was recently extended by cutting it in the middle just forward of the full beam engine room and adding the addition of 3 meters. Can someone give me advice with asking questions /research I need to ask if there is such a thing of this done properly? And its effects?

    I’m not a naval architect and concerning questions come to mind like: is the hull plate thickness of a 100 foot yacht the same as an 85 foot yacht which means to be done properly Would the whole bottom need to be replated? Also a bigger boat would need to accommodate a bigger elcectrical capacity. I would like help on organizing these kind of questions to ask the broker, owner, and yard that did the work.

    Thanks in advance .
     
  2. bajansailor
    Joined: Oct 2007
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    bajansailor Marine Surveyor

    Generally, re the plate thickness, there should be no worries about 'stretching' the boat by 3 metres / 10' - there should be a good margin (re strength) on the existing steel thickness to allow for corrosion.
    Bear in mind that many much bigger ships have been 'stretched' by adding a new section amidships, and they have not had to be replated.
    Re the length of 85', is this the 'before' or 'after' length?

    Are you happy to post any photos of the vessel from before and after?
    Do you know which yard did the extension work, and who designed / project managed the build?
     
  3. TANSL
    Joined: Sep 2011
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    TANSL Senior Member

    You may be right, I can't know. What I do know is that on many occasions it is necessary to add material to increase the resistant modulus of the main frame.
    The excess thickness due to corrosion is not a margin that can be used to avoid increasing the thickness of the plate. This margin must be kept over the excess thickness necessary to withstand the new stresses on the shell. But, after doing a little calculation for this particular case, it seems that, in general, it would not be necessary to add more thickness. As always, specific cases should be studied.
     
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  4. Bornyesterday
    Joined: Aug 2020
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    Bornyesterday Junior Member

    Thank you for replying It was an 85 -86 foot yacht now they are saying 98 feet. I don’t think the pictures will help much but I will give it a go to post. The orange life rings are on the extension. As you can see there have been other modifications. The way I look for the extension area is there is a wider space between the aft and forward set of port holes in the hull. Also just aft of the forward fashion plate. It looks like they removed the plates covering where the fashion plate meets the hull also. Since hull is steel and superstructure is aluminum there might of been electrolysis there. Look at the spots on the hull in that extended area I hope they are not drain holes. As far as the yard and project manager information I don’t know yet. In the correspondence so far it was Eluded to that it was the turquoise yard from my recall.
    CD7B0B90-317B-4437-82D3-BEDE7D59FB25.jpeg A963FC83-CAB8-4DE1-8D8B-5990676C8BC0.jpeg Hope this helps.
     
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  5. bajansailor
    Joined: Oct 2007
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    bajansailor Marine Surveyor

    Thank you for the photos - it looks like they did a good job on the extension.
    I think she is a Benetti - here is a sistership for sale -
    Motor Yacht Benetti for sale - YachtWorld https://www.yachtworld.com/boats/1973/benetti-d-3688524/
    I remember seeing another sistership called Bambu, many years ago in Antigua.

    What appeals most about this yacht to you, and what is your intended usage?
    And in what locality - or potentially worldwide?
    Have you made an initial inquiry already of the broker, or are you waiting on feedback from your post here before approaching them?
    Whatever you do, if you do decide to proceed further, you should have a very thorough survey carried out on the vessel - you will also need this to obtain insurance on her if the survey report does not disclose any major defects, and you decide to purchase her.
     
  6. gonzo
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    gonzo Senior Member

    You should really get someone to inspect the job. The insurance company will require a survey anyway. You could get a preliminary survey limited to the extension only.
     
  7. Bornyesterday
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    Bornyesterday Junior Member

    bajansailor: What appeals to me is; the profile, canoe stern, made of steel, galley on main deck, the CAT engines, (the length it was), and storage on the main fore deck to mention a few. Intent is: to live aboard, travel the Med, then cross the Atlantic, and eventually bring it to the west coast. I have made multiple communications with the broker and waiting on more feed back. I would like to be one step ahead of him is why I posted. As for insurance ... I would try to use the broker that I have used before, 16 years on a 82 foot schooner with NO claims visiting nine countries. As far as surveys: I tried to purchase a sister ship to this boat in Florida at the Bradford yard (which the broker sold from under me and my contract) years ago and used a guy named Pliske. I liked the man but not the price and would use them again if push came to shove, because I know how expensive repair is. This man has died since and have talked to his son, I like his son also and though he was knowledgeable. Wish there was an alternative and not comfortable yet with anyone else. I would definitely go into the survey letting the surveyor know what I do at this point. The sister ship listing you shared with me I have follow for 20 years. The down below galley and hard top reined it for me so it hasn't been as easy decision for her. The additional length (which I didn't want) puts pressure on my decision and all the research/questions which it caused makes me go back and forth between the two boats. I thought if I just do my do diligence on both the answer would surface keeping in mind that things can be altered like the hardtop but not the extension and I don't want to move the galley thinking it would be a lot of work and down time. You have brought up comments on the kind of questions I am looking for, thank you.
     
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  8. Bornyesterday
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    Bornyesterday Junior Member

    Thank you for your reply
     
  9. Bornyesterday
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    Bornyesterday Junior Member

    Gonz that preliminary survey limited to the extension only is another approach, thank you.
     
  10. bajansailor
    Joined: Oct 2007
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    bajansailor Marine Surveyor

    Apologies for the thread drift, but I thought that BY might like to see details of a classic (and much older - built in the 60's) 80' motor yacht that might have provided inspiration for Benetti re their similar size motor yachts built in the 70's.
    This is Morning Watch - I first came across her in 1977, after she had crossed the Atlantic from the Canaries to Barbados.
    The photo below shows her at anchor in Carlisle Bay here.
    Also attached are a couple of PDFs which the broker at Ardell kindly emailed to me 7 years ago, when I saw that she was for sale.

    Morning Watch anchored in Carlisle Bay .jpg


    ,
     

    Attached Files:

  11. Bornyesterday
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    Bornyesterday Junior Member

    What a beauty and she has my favorite engines Gardener. Looks like you got the listing from Ardells the broker that had the listing that sold my last boat what a mistake using them. My boat nothing owed the buyer all cash. It took 6 months. Ardell’s were so incompetent's that it was unbelievable. My boat was register as documented vessel, and a coast guard certificate approved for 55 passengers. The schooner was maintained meticulously by me and 3 crew.
    The buyer's broker offered was all cash, no survey, one time only offer. Tom Corkett (of Ardell) told there broker they should have a survey, this was not representing with my best interest and not the offer I agreed to. All Tom Corkett had to do was except the offer from their broker. He lied continuously through out the negotiation to me and the buyer broker. I thought this could never happen with a broker in prestigious Newport Beach. Just goes to show you boat shoes, khaki pants and thinking he was privileged didn't keep him from being a low life *****. Thank god the buyer and I had a kindship of quality and a good relationship so the deal eventually went through, but because of this 6 month delay I missed the boat I was selling mine for, Progression ex Bambu.
     
    Last edited: Mar 8, 2021
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  12. Mr Efficiency
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    Mr Efficiency Senior Member

    Looks a beauty, no signs of any unfairness, lumps or bumps or dishing, you might have guessed from the pics it was GRP
     

  13. peter radclyffe
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    peter radclyffe Senior Member

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