Published in: Tuesday, 11 March 2014
Features > Cacos V (Page 1/1)

Cacos V

This ultra-voluminous yacht from Admiral Tecnomar proves that silence is indeed golden.

AMONG THE MANY REASONS why buyers commission superyachts is the quest for peace and quiet. It’s often figurative, of course, a way to escape from the harried pace of the business world and life in general on land. But, in the case of at least one new superyacht, not only is that peace and quiet literal, there’s a lot more of it to enjoy.

Cacos V, a fully custom 40-metre motoryacht delivered by Admiral Tecnomar, has the distinction of being the quietest yacht ever classed by the Italian naval registry (RINA). In addition, given the decibel and vibration limits that all of the classification societies set, Cacos V is among the quietest yachts in the world. It all amounts to an impressive accomplishment, made even more so considering Cacos V is the first yacht delivered following the emergence of the Admiral Yachts brand from bankruptcy. Admiral is now under the ownership of the Italian Sea Group and rebranded as Admiral Tecnomar. 

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Cacos V holds RINA’s Comfort class notation, under which there’s formal scrutiny of sound and vibration levels. For those who like to research technicalities, the specific class is COMF (Y) 90, 100. Even if you’re not technically oriented, it’s worth a short education to understand RINA’s Comfort class, as well as the Comfort class of the other societies. All of the classification societies’ Comfort notations specify sound level limits that meet or beat parameters set by the International Maritime Organisation (IMO), and all of the vibration levels meet or exceed standards set by the International Organisation for Standardisation (ISO). Sound levels are measured as decibels, or dB(A).

The IMO stipulates that sleeping cabins should have sound levels no higher than 60 db(A) and that enclosed recreation areas (like saloons) should register no higher than 65. To put those numbers into perspective, the level of normal conversation is 60. For vibration, given as mm/sec, ISO recommends the level be at or lower than 6mm/sec. For comparison, a measurement of 3mm/sec allows for comfortable sleep while underway, and anything at or above 7 mm/sec while underway can induce great discomfort to the point of motion sickness.

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For both sound and vibration, RINA has stricter standards than the IMO. Saloons and cabins aboard semi-displacement yachts such as Cacos V are permitted to have sound levels between 45 and 55 db(A) while the yachts are in harbour. Underway, the allowable sound levels are 60 to 70 in the saloon and 50 to 60 in cabins. For vibration, RINA stipulates an allowable range of 1 to 4 mm/sec in saloons and cabins while underway, and 0.5 to 2 mm/sec in harbour.  

Now, here’s where it gets interesting. As impressive as RINA’s figures are, the ones measured aboard Cacos V are remarkable. In the owner’s suite, the sound level at the 16-knot cruising speed was 49.1 db(A). At anchor, the figure was 36.2 db(A). For a little perspective, a whisper is about 30 decibels, and a home computer hums at about 40 decibels. 

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To read all of this article pick up a copy of the 2014 Mar/Apr issue of Asia-Pacific Boating magazine, or buy it online from