Gladding-Hearn Shipbuilding has delivered a new 493-passenger high-speed catamaran ferry that will shuttle passengers between Hyannis, Mass., and Nantucket Island.

The 157’7”X34’6”x6’11" Grey Lady IV was designed by Incat Crowther and constructed at Gladding-Hearn, Somerset, Mass., for Hy-Line Cruises, a division of Hyannis Harbor Tours Inc.

The all-aluminum Grey Lady IV is powered by four 2,200-hp Cummins QSK60-M, EPA Tier 3 diesel engines that turn Hamilton HM721 waterjets through Twin Disc MG-61500SC horizontally offset gears. The ferry’s top speed is 34 knots fully loaded.

If one of the propulsion systems should fail, the boat will draw full power from the remaining three engines. Each hull is equipped with a 125-kW Cummins QSB7-D (M) Tier 3 generator.

“This kind of margin and redundancy is just prudent business for a ferry that will operate close to 5,000 hours per year,” said shipyard president Peter Duclos.

The Grey Lady IV is larger, but similar to the three previous Incat Crowther catamaran ferries Gladding-Hearn has built for Hy-Line. The new vessel is outfitted with a Naiad Dynamics trim-tab, ride-control system, which uses a motion sensor to measure relative movement and transmits an electrical signal to the appropriate hydraulic device to counter the boat’s action through the waves, improving comfort and safety for passengers.

“By keeping the unwanted motion and steering to a minimum, the system can also minimize the speed loss in rough seas,” Duclos said.

The main cabin seats 160 passengers and includes a full-service concession, heating and air conditioning, two heads, and a large luggage room aft. An etched-glass screen separates the passenger seating area from the concession and condiment counters.

The second deck, with interior seating for 154 passengers and exterior seating for 46, features heating and air conditioning, premium seating forward, three heads, and interior and exterior cocktail bars. The premium seating area for 32 is separated from the main passenger area by a half-height bulkhead with glass screens.

The third deck, with the pilothouse forward, provides exterior seating for 137 passengers. Access to the wheelhouse, which is equipped with centerline and port and starboard engine and waterjet controls, is from exterior doors in the aft bulkhead.