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Noise Abatement – Part I

Understanding the Sources of Sound on the Water

Sailboats can be some of the most beautiful craft on the water. There’s an elegance in cruising a sailing yacht under wind power, hearing nothing but the wind and water. On most boats, this results in a relatively quiet experience.

However, even sailing craft generate increasing levels of noise as speed increases.

“There’s an elegance in cruising a sailing yacht under wind power, hearing nothing but the wind and water.”

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A Noisier Ride: Sportfishing Vessels

Now let’s consider sportfishing vessels, which operate at high speeds with motorized propulsion. Noise comes from not just our surroundings, but from all the onboard machinery.

Engine noise, air resistance, water turbulence, and installed equipment all combine to raise sound levels dramatically.

“Noise comes from not just our surroundings, but all the machinery added together.”

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What Creates Undesirable Noise?

Some of the most common sources include:

• Wind and water (amplified at speeds over 30 knots)
• Generators, HVAC, and hydraulics
• Large diesel engines, especially at high speeds
• Driveline and exhaust systems

On high-performance sportfishing yachts, engine noise is the primary contributor.

“Riding at 40 knots in the cockpit typically means yelling between yourselves to hear one another.”

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Subjectivity and Sound

While we can measure decibels with precision, perception of noise is highly subjective.

Factors that influence sound experience:

• Frequency of the sound
• Location on the vessel
• Personal hearing sensitivity

For instance, wind may dominate on the bridge while engines and equipment overpower the salon.

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Engineering Quiet: Design and Construction Factors

Propeller noise and shafting arrangement also play critical roles. On some yachts, owner/builder contracts specify maximum decibel levels by location, ensuring comfort in areas like the master stateroom.

“Even wave slap noise at rest can be quantified and monitored.”

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Hull Construction and Noise Control

Different materials offer different levels of noise suppression:

• Aluminum: prone to vibration and noise
• Fiberglass: better, but can still be loud in single-skin designs
• Sandwich laminates with foam core: help dampen vibration
• Cold-molded wood hulls: excellent at damping noise and vibration

“There is truth to the comment I regularly hear that cold-molded hulls feel more solid and are quieter.”

Mass is your ally when it comes to noise abatement. Additional core material or products specifically designed for noise suppression can make a significant impact.

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Looking Ahead

This is just the beginning of the discussion. Excessive noise can ruin the experience on the water, and understanding its sources is key.

In the next installment, we’ll explore more specific causes and effective mitigation strategies to help you enjoy a quieter ride.

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