What you need to know about boat stabilization before buying one.
It will probably be the most important option on your boat for your comfort at sea.
There are several types of stabilization systems depending on the type of boat, and yes, this is a very important feature to ensure the most comfortable cruising experience possible. Be vigilant when selecting your next boat.
Here is the list of systems:
A- Basic systems installed on the transom (completely submerged for direct contact with the water flowing under the boat).
– The famous old Bennett trim tab systems
– Stabilization with ZIPWAKE (very effective)
– Stabilization with Humphree INTERCEPTOR systems (very effective)
– Seakeeper RIDE systems (very effective)
B- Gyroscope systems, now also found on center consoles over 30 ft (systems operating on 12 or 24 V) and on yachts from 30 ft to over 100 ft. They are more than 95% effective at anchor but become less effective the faster the boat moves (10 or 15 knots and above):
– The best-known system: Seakeeper
– An Italian brand called QUICK
– Dometic Smartgyro
This type of stabilization system has proven itself over the years, and its effectiveness has been demonstrated. Buying a yacht over 45 feet without this system on board will make resale rather difficult for an American boater navigating in their waters, especially along the U.S. East Coast.
Seakeeper is water-cooled, while Quick is not. When buying a new yacht, you normally have the choice between the two systems. In general, they require about 1.5 to 2.5 kW to operate, with a minimum startup time of 20 minutes before activation. Therefore, the generator must be operational.
However, Seakeeper offers a system adapted for center consoles that does not require a generator.
C- Fin stabilizers (several types are available on the market). Usually, they do not provide stabilization at anchor, although some do. These are fins installed below the waterline (port and starboard) on the sides of the boat, always completely submerged. They are generally installed on boats over 50 ft, but more commonly on yachts over 90 or 100 ft. This system is generally more effective at speeds of 10 or 15 knots and above.
There is also a system called the Magnus effect, but that system will be covered in another article.
Here are some well-known manufacturers:
– Humphree Fins
– Sleipner
– Quantum
– CMC (Waveless)
Is it essential today?
Good question. Personally, I would say yes, especially considering the waters where you will be navigating.
Of course, on lakes and rivers, it is less necessary, but for resale purposes, it becomes very important.
For boats under 30 feet:
Transom stabilizers need the boat to travel at a relative speed, generally around 10 knots or more, to be effective.
The BENNETT system is still sold and installed on many boats of all sizes by a wide range of manufacturers. Personally, I would be disappointed to buy a boat over 25 ft with this system.
You really need to ask whether the manufacturer offers, as an option of course, at least ZIPWAKE, INTERCEPTOR, or SEAKEEPER RIDE systems. Depending on the boat’s length, one of these systems should be considered.
However, a ZIPWAKE, INTERCEPTOR, or RIDE stabilization system can be installed relatively easily if the boat does not already have one. Installation costs range between $2,500 and $6,000 depending on the model.
And one thing is certain: buying a boat over 45 ft equipped only with Bennett trim tabs is something you should question before purchase, not only for your comfort but also for resale value. You have to question the boat brand itself—how can a manufacturer neglect such a system?
For boats over 30 feet:
For a larger boat, say 30 ft and above, you should consider a gyroscope. Gyroscopic stabilization is fully effective when the boat is completely stopped (what is called “zero speed”) and starts to lose effectiveness beyond 10 or 15 knots.
Azimut Yachts was one of the first manufacturers to make this system available to recreational boaters, starting in 2008.
Therefore, a 2015 or newer boat without a gyro stabilization system becomes harder to resell.
For a gyroscope, here is the price range for a SEAKEEPER retrofit installation on a boat that does not already have one (prices in USD):
But of course, the best-known manufacturers still install them on their new boats. In any case, stock boats at dealerships are almost always ordered with a GYROSCOPE stabilizer.
If not, it usually means the dealer wanted a lower selling price to attract buyers more easily.
As mentioned, it depends on where you navigate. But for the ocean, the Gulf of St. Lawrence, or the Great Lakes—where there is always some wave action and sometimes very significant waves—it is a MUST.
For larger yachts, ideally both systems are installed. Under 120 feet, that is ideal. For yachts over 120 ft, they almost always use FINS with the ZERO SPEED option, making them effective at anchor as well.
You should know that all cruise ships have FINS. But theirs are massively oversized.
One good piece of advice: to maximize a boat’s resale value, the presence of certain options is crucial. Of course, highly effective stabilization is important, but also large refrigeration capacity, sun protection (umbrellas and hardtops), separate showers, wood flooring, and minimizing the amount of canvas that needs to be installed at night or when leaving the boat.
Also install dehumidifier units (for example in showers) and ventilation systems, including in the engine room.
Here is a link to another article about stabilization on the Ita Yachts Canada website. Follow this link.
For good advice when buying a new or used boat, contact us. Our professional services will certainly appeal to you.
We are brokers for Ita Yachts Canada and its ProprioBateau division.
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