On The Level Page 4
On The Level
Ferretti’s New Anti Roll Gyro
By George L. Petrie — July 2004
Mitsubishi Heavy Industries, in concert with Ferretti Group, has recently developed an entirely new approach to roll stabilization, the Anti Roll Gyro, or ARG. Rather than using small gyroscopic sensors to control external fins or other devices, the system draws on technology developed for stabilizing satellites in space, using the effect of a large gyroscope to reduce the rolling motion of yachts.
The gyroscope units vary in weight from 600 to around 3,600 pounds and take up about the same space as a genset. Senior editor Capt. Bill Pike traveled to Italy to see the system in action aboard Norberto Ferretti’s personal yacht, a 108-foot Navetta. The yacht was fitted with three medium-size units, each drawing about 3.5-kW of power. While the system was designed for use in one- to three-foot seas in sheltered anchorages, six- to eight-footers were in existence at the time, so the practical usefulness of the system was difficult to accurately measure. However, by referencing a distant shoreline during testing, Pike estimated roll reductions at approximately 50 percent, a figure in line with the manufacturer’s claims. Moreover, he reported no noise from the units, except for a faint hum he heard while standing next to them in the boat’s garage and utility room.
Ferretti will be offering ARG as standard equipment on all Custom Line yachts (from 94 to 128 feet) and on the Ferretti 83- and 88-foot models. It will be available as an option on most other models built by the Ferretti Group. Currently available in Europe, the system will debut in the United States at the Fort Lauderdale International Boat Show this year. —G.L.P.
Ferretti Group USA Phone: (954) 525-4550. www.ferrettigroupusa.com.
Mitsubishi Heavy Industries America Phone: (212) 969-9000. www.mhi.co.jp.
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This article originally appeared in the June 2004 issue of Power & Motoryacht magazine.