Construction Navale
Parallel hybrid propulsion

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Parallel hybrid propulsion

Construction Navale

The parallel hybrid propulsion system of a new 135-passenger excursion boat can be switched to electric mode to explore a nature reserve’s waters quietly and ecologically.

Hybrid propulsion systems that can be switched between an internal combustion engine and an electric motor are proving increasingly popular with operators frequenting environmentally sensitive waters. A case in point is Corsica-based Nave Va, an excursion operator that takes tourists on boat tours of the island’s spectacular Scandola Nature Reserve. Nave Va asked electric motor manufacturer Leroy-Somer and Mayday Electronics to develop a parallel hybrid propulsion system for its new boat, a CNB Pro20 designed by naval architecture firm Bureau Mauric and built by Bordeaux-based CNB, a subsidiary of French boatbuilding group Bénéteau. The aluminium-hulled Chjara Stella is 19.95 metres in length for a beam of 5.8m and can carry up to 135 passengers. She was commissioned for the 2016 summer tourism season.

Two electric, two diesel

The parallel hybrid system’s electric mode is used at low speeds and diesel propulsion at higher speeds. Silent, pollution-free electric propulsion is used for docking and other port manoeuvres and, more importantly, in the nature reserve’s protected areas. This mode offers a maximum speed of 8 knots and an endurance of 6 to 8 hours at 6 knots. Battery