HamiltonJet announces diesel-electric hybrid waterjet trials
Hybrid propulsion is coming to waterjet systems, with New Zealand specialist HamiltonJet about to trial its first roll-outHamiltonJet, the New Zeland company specialising in marine waterjets, says it has developed an electric hybrid-engined system that cuts the cost of running a vessel.
The Hamilton Electro-Hybrid Drive System looks like a conventional waterjet, with an engine at one end and an impeller drive unit at the other, but the driveshaft is split so that it also passes through an electric motor.
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The parallel hybrid system – similar to that used for cars – can tap into a bank of batteries for near-silent operation, or work with the conventional diesel-fuelled inboard engines to lighten the load and improve low-rev responsiveness.
HamiltonJet said it has introduced the hybrid drivetrain as governments worldwide start to call for lower emissions around populated areas where boats and people mix.
Technology showcase
The company is fitting its system to White Morph, a 14.8-metre Teknicraft foil-assisted catamaran that is capable of a top speed of 43 knots.
Hamiltonjet said White Morph would be fully operational by early next year, showcasing the technology.
“Combining the extended range of a diesel engine with the benefits of electric assist, it is often the lightest weight option as well,” HamiltonJet said.
“Both the electric motor and the diesel engine drive the waterjet directly, either individually or together to boost power.
“The electric motor can also act as a generator, using the spare capacity of the diesel engine when it is operating at part loads," it said.
“Batteries provide the buffer, and can also be charged onshore for fuel saving.”
However, while the technology looks simple on paper, HamiltonJet said the set-up was complex and required high levels of integration to work seamlessly at the helm.
One of the big benefits of the HamiltonJet set-up will be JETanchor, a joystick control system that will allow the vessel to silently hold station, and even make precise low-speed manoeuvres with the help of GPS, the company says.
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