sleipner vector fins or seakeeper 16 for a 75 ft ?

pascalsunseeker said:
Hi guys,

At this moment the people from the factory are looking for the possibibilyty of installing 2 seakeeper sk9 in the sportyacht 74. if they don't find the place to install this 2 seakeepers then I asked for installation of the fins and 1 sk 9 on top. they are thinking this systems cannot work together which is for my very strange because I thought I read more then once on this forum that this 2 systems can work perfect together without confusion each other. grtz
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I'm with jfm on this and I say this as an owner of a boat with a SK9 installed. I have been on his boat at anchor and other boats with zero speed fins at anchor and the fins work. There is absolutely no need for a Seakeeper in addition to the fins (unless there is another reason like noise/vibration of the fin mechanism). If the Sleipner fins are working satisfactorily and you are still not happy with the stabilisation then I very much suggest you will not be happy with the stabilisation offered by the Seakeeper either. As has been said before, no stabiliser in the world can stop fore/aft pitching motion at anchor and nor can they stop the boat going up and down as the wave goes under the boat. All they can do is stop some of the side to side rolling. Btw one big disadvantage of the Seakeeper is that it takes 40 mins to spool up to speed so dont expect to just switch it on and get instant stabilisation

If I were in your position, I would be talking to Sleipner, not Sunseeker, about this and getting their assurance that their system has been checked and optimised for this boat. At the very least one of Sleipner's technicians should accompany you on a seatrial to check that the system is working 100%. But I would certainly not waste €100k or €200k on 1 or 2 SK9s until you understood exactly what the situation with the Sleipner fins was and what the SK9s can and cannot do for you
 
jfm said:
but it continues to apply to gyros underway just as at anchor, hence the "30%" point .
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I think 30% is being kind. As I have said before on another thread about my SK9 installation, it works well at rest but as soon as you start moving there is a discernible reduction in stabilisation and by 10kts there is no point in having the SK9 switched on. It is perfectly possible that my SK9 is a bit undersized for the size and weight of my boat (although it was recommended for my boat by Seakeeper) but I dont believe that a larger gyro would make all that much difference underway. Btw apropos nothing in particular, I did hear a story about a Pershing in Antibes which has just had a SK fitted. Knowing the shortcomings of the SK at speed, the owner decided to oversize the SK for his boat (not sure of the model) but fitting a large gyro in his boat caused such a loss of speed that he's now having his boat repropped! Unintended consequences!
 
That's very good advice from Deleted User.
If the s'yacht 74 is hard to stabilise e.g. v short roll period, then pascal what you're proposing may not solve the problem and could be an expensive mess. Did you measure the roll period?
Imho don't get the Mitsubishi. It's ancient technology. You will also kill the residual.
@petem, not sure agree Martyn's comments as you report them. He can only be comparing squadron 78 and 65. I know him well- I'll ask him sometime.
 
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jfm said:
Yep. In fact they have ditched Mitsubishi and offer seakeeper if you want gyro, Sleipner if you want fins, and both together on the £6m stuff like the rather nice ferretti 920 ( my current favourite).
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Oooh, new boat build thread coming?;)
 
@Deleted User, not imminently. I need a year when I can do 2-weekly factory visits and am too busy currently. Plus the old boat is working so well. One of these days. :D

@piers, there has been plenty posted on here. They're electric, using catalogue factory automation gearboxes. First couple of years worth were absurdly noisy; people say they are now quieter. I have had legal threats from them (half a dozen emails from one of their directors) for hosting on my YouTube account a video shot by them (and widely distributed by them) demonstrating the noise. It's still there on my account. I told them what's what and just put up another even worse (in screaming noise terms) amateur video shot inside a master cabin on a Humphree'd boat (a ferretti) to which they have no IP rights and threatened to tick the "make public" box on YouTube, and funnily enough they backed off on thr legal threats, not wanting that video to circulate.
I don't doubt they stabilise the boat well. Before buying them just check that the noise levels, and the company's style, are acceptable to you.
 
Hi Guys,

last week I spec'd my boat definitly at the sunseeker house in Poole. I spec'd the boat with the sps 66 vf 1050. ( also because there was no alternative they could offer me) Meanwhile Sunseeker admitted that the boat which I sea trialed was not fine tuned by the engineers from sleipner and were sure that the performance could be better than they were at that moment. I must tell that the people from sunseeker Poole(factory) and joined by sunseeker france were very helpfull with all are demands on the new boat. greetings Pascal
 
pascalsunseeker said:
Meanwhile Sunseeker admitted that the boat which I sea trialed was not fine tuned by the engineers from sleipner and were sure that the performance could be better than they were at that moment.
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Q.E.D., though it's hard to understand on which basis they seemed so sure of the opposite (as I understood) during the seatrial… :confused:
Anyhow, all the best for the next steps, and don't forget that pics of new builds are always welcome here in the asylum! :encouragement:
 
Hi MapishM,

thank you for your support ! Indeed as you said they can not be sure that the systems when its fine tuned works better than the sea trial, I know. but because there is no alternative and I read a lot of positive comments on the sleipner fins from the forum members so I am confident in the fin system. can you explain me how to post some pictures when I receive some in the coming months from the factory. grtz
 
Morning all.

A little bit late to this thread and all the others about gryos. Never had fins but I've had an SK9 (I think) on a Targa 62 for the last couple of years and it's been revolutionary. Like others, not sure I've noticed anything underway but the T62 is a big speedboat anyway so not huge amounts of roll as CoG is a lot lower in carpy seas. However, in an anchorage - like the other day when wind was coming off land and swell coming into the bay (beam), we were the only one that could sit there for the duration as we weren't rolling like a piggy. Only noticed it when I went down on the platform for a swim and was getting washed off it vs people on the boat sitting there chatting. It was a classic "throw up" environment. Wouldn't be without one again and would retro-fit now on the right boat. Upgrade coming but SK is still part of the package. Would not have considered it without.

So, without my limited knowledge of physics at this time of night or BS, real world for me says gyro works at anchor. Not great at P-speed but don't have a top heavy boat..

M
 
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