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The HH44 catamaran utilizes an EcoDrive hybrid propulsion system that integrates a 10-kilowatt electric motor with a 3-cylinder Beta Marine diesel engine on each hull.3:48 The electric motor connects to the shaft via a belt, allowing for four distinct propulsion modes: diesel-only, electric-only, hydro-regeneration, and diesel-generator mode.3:55 In electric-only mode, the system provides approximately four knots of speed for three hours at 50% throttle, with range extended by solar input.10:13 Hydro-regeneration occurs when the gearbox is in neutral and the propeller free-spins while sailing, feeding power back into the 48-volt lithium battery bank.12:29 The system uses a single throttle lever for both diesel and electric propulsion, employing a position sensor to translate input into motor output.16:59 This setup provides redundancy, as the diesel engines can charge the 12-volt start batteries independently if the lithium bank fails, and the electric motors function separately on each hull.7:35

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