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Old 06-20-2012, 03:14 AM   #1
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Options for active fin stabilizers

I'm looking at fitting some active fin stabilizers. I'm reliably informed that they make the world of difference, and having already experienced some rather lively motion on a day that wasn't blowing all that hard I'm quite keen.

Any suggestions for brands/suppliers and where to get fitted in the Puget Sound area?

Boat is Ocean Alexander 50. What are these things gonna cost?
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Old 06-20-2012, 05:56 AM   #2
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This is my system:
Demo Model | Gyro-Gale Stabilizers
4 fin and i am very happy.
The wave in caribicwater are very fast but we are lucky.
My Boat : Marine Trader 50 feet.
Norbert
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Old 06-20-2012, 09:40 AM   #3
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Originally Posted by supertramp View Post
This is my system:
Demo Model | Gyro-Gale Stabilizers
4 fin and i am very happy.
The wave in caribicwater are very fast but we are lucky.
My Boat : Marine Trader 50 feet.
Norbert
Thats a pretty cool system.

I got a quote on Naids, and Westmar and both came to about $40K
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Old 06-20-2012, 11:10 AM   #4
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If the cost is prohibitive, you could consider Paravane stabilizers.

SD
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Old 06-20-2012, 05:14 PM   #5
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Did your quote include installation??
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Old 06-20-2012, 05:44 PM   #6
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Quote:
Originally Posted by supertramp View Post
This is my system:
Demo Model | Gyro-Gale Stabilizers
4 fin and i am very happy.
The wave in caribicwater are very fast but we are lucky.
My Boat : Marine Trader 50 feet.
Norbert
This is worth considering, I've asked for a quote.

In principle 4 fin should be a good solution, and they do claim to be cost-competitive. One potential concern is the bulk of all the pieces. What are the dimensions of the air tank and other bulky components?
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Old 06-20-2012, 05:55 PM   #7
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This is worth considering, I've asked for a quote.

In principle 4 fin should be a good solution, and they do claim to be cost-competitive. One potential concern is the bulk of all the pieces. What are the dimensions of the air tank and other bulky components?
The System Gyrogale is different from other systems- look here:

Why Gyro-Gale Stabilizers

I hate oil highpress-systems in the machineroom, you like a sure system think in air systems.
My system has two air compressors !
Norbert
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Old 06-20-2012, 06:09 PM   #8
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This is worth considering, I've asked for a quote.

What are the dimensions of the air tank and other bulky components?
Take a look for the Manometer, dryer and other parts and you have a idea with the dimensions.
Norbert
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Old 06-20-2012, 08:48 PM   #9
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Did your quote include installation??

Yes, It included installation, and was for a 9 knot cruise speed.

I was really just curious at the time.

My boat is a soft chined boat with a pretty flat bottom. The conventional wisdom is that fins won't help that much, but of course the folks at Naiad thought differently.
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Old 06-21-2012, 03:47 PM   #10
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Stabilizers will make an amazing difference for the comfort of those on board. Whenever I do a sea trial on a boat with stabilizers, I always make sure that we turn them off for awhile so that everyone can feel the difference.
Most boats can handle the water much better than the occupants, fins will make the ride less tiresome if conditions are poor.
I would suggest to stay with the major brands for service and parts.
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Old 06-21-2012, 05:44 PM   #11
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Yes, I accept that they will make a big difference for comfort. My preference is certainly for major brands.

The gyro-gale systems have been around for quite a while, have a few supporters but just as many detractors. And not many systems installed in total it would seem. See to be a risky choice.

The Seakeeper gyros would be great if designed in, but finding room for one in a retro-fit isn't simple. Seakeeper Website
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Old 06-22-2012, 04:53 AM   #12
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Brian: I was going to PM you and suggest you at least get a quote from Mitsubishi &/or Seakeeper. I've read that installation is easier than active-fins; and of course the two advantages are NO fins and the stabilization works even when at anchor (possible now with Naiad but extra cost). Mitsubishi seems to be targetting the smaller boat market.
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Old 06-22-2012, 07:15 AM   #13
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Paul
Thanks for the suggestion of Mitsubishi, as they may be easier to fit in. There would be the option of fitting two of their small ones rather than the mid-size unit also. As you say, gyro systems have two big advantages. Will try and get prices for a range of options, but am hoping the gyro ones are cost competitive and fit!
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Old 06-22-2012, 09:36 AM   #14
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I really like the idea of a no fin gyro type stabilizer.

The problem is where to put the thing!

They seem to be about the size of a generator!
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Old 06-22-2012, 09:50 AM   #15
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I really like the idea of a no fin gyro type stabilizer.

The problem is where to put the thing!

They seem to be about the size of a generator!
THIS!!!

I'd love to add something like this in the future (if I come into some money), but I can't, for the life of me, figure out where we could put in on a 35' trawler. *sigh*
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Old 06-22-2012, 03:28 PM   #16
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THIS!!!

I'd love to add something like this in the future (if I come into some money), but I can't, for the life of me, figure out where we could put in on a 35' trawler. *sigh*

I went to the mitsubishi stabilizer web site.

The unit is something like 3' X 2'

I'm going to look at my lazarette carefully.
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Old 06-22-2012, 04:19 PM   #17
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One think to note with the gyro vs. active fins-the gyro, like the Seakeeper, needs constant power to it. No electricity, no stabilization. The active fins are hydraulic and thus work whever the engine is running. From my experience, having an ABT Trac sfin system and being on a boat with Seakeeper, the result is about the same.
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Old 06-22-2012, 06:34 PM   #18
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Whenever the engine is running, you (should) have power. At anchor, you need to run the genset OR the main engine to operate NAIAD's at-anchor stabilization system; with the gyro, you would need to run the genset: no difference I think. I cannot find it now but I seem to recall reading that the gyros don't provide quite as good stabilization as active fins (but this deserves research)..but they do have the other advantages noted above. Maybe Brian or someone looking into the Mitsubishi gyro can tell us the current draw and whether it would be feasible to run the gyro on an inverter for a couple of hours (over lunch, for example !) while at anchor
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Old 06-22-2012, 07:13 PM   #19
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For Seakeeper 8000, it seems a ballpark figure would be $75,000 installed. It is for vessels up to 35 tons. It needs 230 VAC and consumes 3000W on spool-up time of 35 minutes, and 1500-2000W in operation. There is also a requirement for some 24V DC, 240W, for control. So inverter operation during lunch could be feasible.

The Mitsubishi mid-size unit, ARG 2500T, is for vessels to 30 ton displacement, has a 40 minute spool-up time and needs a 230 VAC 4.8kW power supply for that period, and 3.5 kW for operation. Don't think it needs any DC power. Still waiting for indicative pricing.

So I guess you would fire up your genny as soon as you get on board at the dock or start breakfast when on the hook. Then by the time you are ready to leave the dock or pull up anchor you have the stabilizer ready for operation. You would need to run the genny at anchor if you wanted the "zero speed stabilization" mode for any length of time. Perhaps no worse than running it all night for aircon if in a period of really hot weather. But seems to me you would still avoid rolly-type anchorages if possible.
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Old 06-22-2012, 07:26 PM   #20
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Brian: great to have these details, thanks. You have two genset's don't you? Couldn't you sell one to help fund you into whatever stabilization system you go for AND free up some space??

paul
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