Thank you for sharing your experience! What is the tonnage of your vessel?

@@ElliYacht1 We have a Defever 49, which is about 28 tons. Normally we cruise at 6.5 kts and after I saw the video of the guys of MY OLOH I contacted them and they advised, because of our low speed, to size one up. Best advise we have had. In your case you cruise at much higher speeds, above 10 kts, and that is what the stabs are calculated for as a minimum. So you will be absolutely fine. We love our stabilizers, wife was about to throw the towel in the ring, she had enough of all the rocking and rolling. Also our dogs were getting sea sick all the time. Now we are a bunch of very happy campers (so to speak), we have a lot more comfort onboard. Great videos you made on the installation and sorry to break into your channel like this, but I agree with you 100%, the electric stabilizers are complete game changers for boaters in our size.

I couldn’t agree more on the 25’s for a troller. Great choice. Interestingly, the actuators are the same on the STAB 20&25. The difference is the fin size.

I’m excited to hear how it all works out! We thought long and hard about the Humphree setup. Beautiful system. Since we’re a 48V backbone system and our 24V system is modest, we opted for the 240V inverted power sourced CMC system. I think the integrated intruder setup is going to be well worth it. The additional roll and pitch control will payoff.

That’s a good call out. Congratulations on the Princess. Wonderful vessel. Our fins will be 23” in height and won’t hang below our keel. However, our props and rudders do so vigilance is always priority one in the San Juan Islands…

@@ElliYacht1 👍

Thanks but we already cut the holes for the fins 😬

It has merit.

Thanks!

Great question. The CMC fins are designed to accommodate high speed planing hulls. The GPS adjusts the fin angle real time based on speed. It’s like a magic carpet. Gyros actually become less effective as speed increases, 8 knots is starting speed of degradation.

Hi Andy, thank you for the encouragement! The hardware is $55k. We’re still doing the install so… the labor costs will be released shortly :-) The 48 OA PH is one of my favorite. I hope to see you on the water this year.

We might be adding those next year. Do they help with the bow pitching too?

@keithhughes problem with the seakeeper is that the bearings need to be changed every 3000 - 5000 hours and in order to do that you will need to completely disassemble the gyro. On top of that, they guzzle electricity, so you almost need a special generator to be able to run them. For us those 2 items made us decide against the gyro system.

The reduction of roll stabilization effect as speed increases for gyroscopes isn’t an opinion, it’s a law of physics. During our design research period it was stated by every gyro manufacturer we engaged with. They can provide more information, if you are interested in debating their product capabilities with them.

@@ElliYacht1 If you understand the reason and agree with it, are you able to explain it? Just curious as to why and how.

When a boat is at-anchor or underway, both systems will improve stability in both situations if sized properly. Fin stabilizers work best when the boat is moving, but bigger fins are needed for optimum at-rest performance than for underway performance. That’s a trade-off that may lead to different decisions, depending on how a boat will be used. Gyros, on the other hand, work best when the boat is stationary, or moving at slow speeds; larger gyros are needed to provide good stabilization when the boat is underway. This also requires analysis of how the boat will be used and when the best performance is most important. The fundamental difference between the two systems is that fins generate greater and greater force as the rate of water flow increases (i.e., the faster the boat is going). This force increases exponentially with speed, which is a massive advantage compared to gyros. A gyro system generates the same amount of force, no matter what speed the boat is moving, so it is less effective the faster you go. When a boat is planing, it is hardest to stabilize; the boat becomes more rigid on a plane, so it wants to assume the angle of the wave. That is, it wants to roll with the wave. Due to the tremendous force generated by the foils at speed, here’s where you can take the greatest advantage of the fins’ underway capabilities. The fins have more power to stabilize the boat exactly when the boat is hardest to stabilize, and as an added benefit, will counteract list from crosswinds or weight distribution. Conversely, as mentioned above, a gyro’s force remains constant, restricted by the size and speed of the gyro flywheel, and it can’t correct for list.

@@ElliYacht1 Okay, I agree with the listing. A gyro can only compensate momentarily for roll, where as fins can compensate continually for list. The lower power consumption of the fins is impressive, though for a motor yacht with large output, even 10kw is not all that much for an engine. I think the fins are a good addition (depending on orientation) for the use of a kite also. I think the stability at speed would largely depend on the centre of gravity, if very low it would be less of an issue and the deadrise of the hull. Thanks for your response and time. Be safe.

We would have had to cut the cockpit open for the Gyro. That was a show stopper for us, along with having to run the Genset.

Everyone learns differently. Watch the sea trial.

Huh?