Two new hybrid ferries being built by Derecktor Shipyards at its Mamaroneck, N.Y. facility for Chatham Area Transit (CAT) of Savannah, Ga., will feature Marine Jet Power (MJP) waterjets as part of their power and propulsion package.
The two 65-foot long ferries will feature dual MJP Ultrajet 305 waterjets and permanent magnet traction motors from BAE Systems for their electric propulsion, with the company’s HybriGen power system allowing for the elimination of large diesel propulsion motors, reducing maintenance, space requirements, and environmental impact.
The ferries’ 308 kWh energy storage system will be provided by Xalt Energy.
The integrated starter generators will pair two Cummins 6.7L marine diesel engines with a BAE HDS 200 ISG generator.
The ferries, operating on short continuous routes between three local Savannah area landings, will have a maximum speed of 11 knots.
“As our region continues to thrive, we have an opportunity to think holistically about what the future of transit can and should be for Chatham County,” said Faye DiMassimo, CEO of Chatham Area Transit.
Waterjets “are well-suited for integration into hybrid propulsion systems,” said BAE.
“As seen in this project, the use of a serial hybrid system allows for greater flexibility in power management, enhancing overall efficiency and environmental sustainability, while benefiting from the utilization of waterjets, namely shallow draft capabilities, high maneuverability, and enhanced fuel efficiency.”
“The unique advantages of make them an excellent choice for the specific operational requirements of the Chatham Area Transit Ferries,” said Kevin Kirby, president and regional director of Marine Jet Power Americas.
Derecktor Shipyards has focused on commercial hybrid construction with four such vessels launched since 2014.
Vessels built by the diverse company have ranged from a boat used for public instruction by The Norwalk Aquarium in Connecticut to a cargo vessel that delivers fresh produce from farms on Long Island to markets and restaurants in the New York City region.
In addition to its New York shipyard, the company operates two yards in Florida and another in Maine.