Gyro Stabilizers for mid-sized yachts

That's nowhere near as interesting as your interpretation of what I wrote.

From my post #9:
Just about every fin stabilizers I tried were very comparably effective, when properly sized and commissioned: Naiad, ABT, CMC, Wesmar, Sleipner (also before their "Vector" stuff).

From my post #14:
I've been on boats equipped with ABT and CMC zero speed (straight) fins, whose performance at anchor was totally comparable with curved fins.

Now, is my English really so bad to not understand that in the second sentence I only mentioned two other brands because they are the ones which I considered on par with Sleipner's curved fins?
That said, I already mentioned that when it comes to personal experience, mine is as good or bad as anyone else's.
So, if yours is difference than mine, fair enough, who am I to argue?

What I find annoying is how frequently in these debates folks seem more interested to shoot the messenger rather than actually debating the subject.
Is that a Southern Florida thing, I wonder?

PS: ref. the tests that Sleipner ran on a Princess (56, as I recall), they were indeed published on their website, already back in 2013.
But promptly removed not long afterwards - why, that's anyone's guess.
Regardless, I was talking of proper independent tests, which shine for their total absence, up to current days.

Spin up time is often mentioned as a downside of gyros but in the real world does anyone really hop on, gets under way and reach rough water quickly enough to need stabilization before the gyro is up speed? especially since when anchored out you likely have the gyro going

now an issue which I have never seen mentioned is the amount of power needed. Zero speed only requires an electric motor running the hydraulic pump. A gyro requires a lot more power doesn’t it? So chances are you will need to run a second generator or limit power usage (shut down one chiller, watermaker and limit cooking). I know that we are always close to the limit with a full house...

When I said that I tried Sleipner stabs, I specified "also before" their vector stuff.
By implication, I hope you'll agree that this means both their flat and curved fins.
Not for 10,000 Nm, admittedly - far from that.
But I struggle to understand what this has to see with understanding their effectiveness at zero speed...

Well, they were/are also very good, both underway and at anchor.
I'm not saying just as good as the vectors, because that would be a bold statement, to be supported by some tests/measurements.
And as I said, I'm not aware of any reliable independent tests on this matter.
But pretty sure, if a difference exists, it's very far from being immediately perceivable from anyone onboard.
In fact, several other folks who were with me, some of which with a much more extensive experience than myself, all agreed on that.

Beware of those!
Though in fairness, also retrofitting fins to a hull not originally designed for them can be tricky.
Neither their placement nor hull strenghtening around the actuators should be taken lightly.
Looking forward to hearing about your next findings!

Is whoever suggested that you might need it a genset seller, possibly?
The max absorption of the Seakeeper 6 is 2300W according to the manufacturer's specs, i.e. 4600W for two units.
A 21kW genset should handle that with no sweat from the start, unless you want to run also A/C or whatever at the same time....

Nope, can't remember to have heard of it.
But I have a funny feeling that they probably wasted another similar amount also on manpower.
Just think of installing and afterwards removing (in a finished boat!) those things, plus installing something else (fins, I suppose?) afterwards...