Ultrasonic Antifouling System FAQ’s

27 Мар 2014 | Author: | No comments yet »
Carver 310

Frequently Asked Questions

How does it work?

The ultrasonic antifouling system by NRG Marine uses the latest digital electronics and ultrasonic transducer technology. This system works by producing multiple bursts of ultrasonic energy simultaneously in multiple frequencies, the energy creates a pattern of alternating positive and negative pressure. Microscopic bubbles are created from the negative pressure, while the positive pressure implodes them due to formations of vapor cavities known as cavitation. The result of the implosion is a micro jet action that creates a cleaning effect on the hulls surface below the waterline. It also resonates and destroys single cell organisms such as algae. Removing the initial link in the food chain prevents barnacles and other marine life to feed on the algae.

Does it really work?

The concept of ultrasonic cleaning is nothing new, it has been around for over 30 years. This technology has numerous applications from cleaning dental and medical equipment, fine jewelry, de-gunking drains and cleaning automotive parts. However using ultrasonic technology to keep your boat hull clean is a relatively new application.

Environmental issues over the past decade or so have gotten much tighter on industrial cleaning products, especially chlorofluorocarbons. The industry needed to find a solution. Ultrasonic cleaning is considered the most viable and effective solution, by using the latest in digital electronics and transducer technology, the industry made a huge leap forward over the past decade to fulfill the needs of the industry.

What is cavitation?

Cavitation is the process where a millions of bubbles in a liquid rapidly collapse producing a shockwave. This shockwave or high and low pressure waves are generated by high frequency sound. During this low pressure wave phase the bubbles are formed, and in the high pressure phase they are compressed and implode.

Is Sonihull systems harmful to fish?

Numerous tests have been done and none show any danger to fish. If they can hear the ultra high frequencies they swim a few more inches away from the hull to avoid the problem.

Will Sonihull help reduce my fuel bills?

A clean hull can save you about 30% on your fuel bill. Any fouling on your boats hull will lead to increased resistance, which in turn means you are burning more fuel for every knot you make. The outcome is compromising efficiency and a poorer mpg figure than with a clean hull, but by how much?


A leading yacht journal undertook some sea trials to answer this question. They measured the performance before and after spring lift of a ten year old Princess 430 equipped with twin Volvo TAMD63P engines that were rated with 370hp at 2800rpm.

Will I still need to paint my boat with antifouling paint?

Princess 30

Painting the hull not only provides antifouling for your hull, but it is also a waterproofing barrier, protecting the gel coat from the effects of osmosis. We still recommend that the boat is protected under the water line with some sort of antifouling paint. To maximize performance in some cases some yacht owners that have the Sonihull system installed have chosen to use a harder grade of antifouling paint. As opposed to the soft self polishing versions, which have a higher drag factor through the water. Although there still is a need for painting below your boats water line, the need to do so will be greatly reduced with the Sonihull system.

Is it true that a Sonihul system has the effect of repelling jelly fish away from the boat?

There is no scientific data to prove this theory. However we have received a few reports that the ultrasonic system has repelled jelly fish. This seems plausible due to the simple cell structure of a jelly fish.

Will Sonihull work on yacht over 60 feet in length?

Yes, the Sonihull system will work on a yacht over 60 feet in length. Due to the surface area of the hull below the water line, the same laws of physics apply. Although this would require several Sonihull systems would need to be installed to get the optimal effect. It is important to note that the transducers need to be bonded to the inside of the outer skin of the hull. So be sure to check that you are able to access this as some yachts have inner skins with a filled cavity. This would hinder the sound waves to transfer through to the outer skin.

What type of glue should be used to bond the transducer to the hull?

An epoxy glue such as Araldite or something equivalent is what we recommend. You’ll notice that the locking ring on the transducer that is bonded to the hull has a gutter built into it. This is to prevent any excess glue from getting onto the threads. We also recommend that you apply a little bit of petroleum jelly to the threads to protect them from any epoxy that may find its way on the threads.

Will Sonihull work on wooden boats?

Princess 35

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