Yanmar install a sign of things to come

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Powered by twin Yanmar 6AYEM-GT engines, the Ada Clara has been built for line fishing in the deeper waters along the WA coast.
Powered by twin Yanmar 6AYEM-GT engines, the Ada Clara has been built for line fishing in the deeper waters along the WA coast.

New WA fishing vessel engines draw international attention from Yanmar specialists.

A new multi-purpose fishing vessel paired with Yanmar 6AYEM-GT series engines is set to create waves in Western Australia’s marine industry, and is already drawing attention from overseas Yanmar specialists.

Shoreline Marine Fabrication based in Henderson built the 86-foot Global Marine Design aluminium vessel with the engines supplied by local Yanmar agent, Power Equipment. Named the Ada Clara, the 26.2m long, 50 tonne fishing vessel can carry a 14-plus tonne fuel and catch load and will take its place as the flagship for the Western Wild Fisheries company.

It was launched for sea trials and systems testing off Fremantle in December, 2018 and turned in an impressive performance under the watchful eyes of Yanmar engineers.

The two 749kW Yanmar marine engines are designed to minimise fuel consumption and optimise performance with precise, digitally-controlled fuel injection.
The two 749kW Yanmar marine engines are designed to minimise fuel consumption and optimise performance with precise, digitally-controlled fuel injection.

The two 749kW Yanmar marine engines are designed to minimise fuel consumption and optimise performance with precise, digitally-controlled fuel injection, thereby reducing operating costs for the fishing fleet.

“Thanks to 500-hour maintenance intervals, long fuel injector life and Yanmar’s renowned low fuel consumption, these engines keep running costs to a minimum, which is what commercial marine operators require,” said Power Equipment WA sales manager, Nick Marsden.

“The key to the performance and efficiency of the 6AY Series is the new staggered injection nozzle and patented ‘ASSIGN’ combustion chamber design.

“Yanmar originally developed ASSIGN for large bore, low speed propulsion engines, so it allows for a very wide rpm range and delivers outstanding fuel consumption.”

Because this was the first time 6AY engines with ASSIGN have been used in this type of application, Shoreline Marine’s installation attracted engineers from Yanmar Japan and Yanmar Asia (Singapore). They visited Fremantle during the Ada Clara’s sea trials to get a first-hand look at the engine and how it performs in Australian commercial fishing vessels.

Power Equipment national marine sales manager, Mark Butterfield, said Australia is the biggest market outside of Japan for Yanmar 6AYEM-GT engines.

“6AYEM-GT engines are used successfully in many commercial marine sectors in Australia, and this latest application has shaped up as a fantastic fit,” he said, describing the Ada Clara’s on-water speeds in initial runs as “remarkable”.

Power Equipment senior service engineer, Jim Kibblewhite, was also at the trials and said the new vessel did better through the entire rev range of the engines than most he has seen.

“Her waterline length no doubt helps with that,” he said. “At 75% engine load she achieved 19 knots, while at 50% load we were still clocking 16.5 knots.”

With its 20-litre displacement and a long stroke, the engines are designed to produce very high torque and, coupled to 2.48:1 gearboxes, enable 1m diameter propellers to be swung on the shafts. The sea trials showed that the vessel is capable of a top speed of 25 knots.

Yanmar engineers were eager to see the Ada Clara undergo her sea trials.
Yanmar engineers were eager to see the Ada Clara undergo her sea trials.

“Even with a simulated full fuel and catch load put on board during trials, the engines lost less than 15rpm at wide-open-throttle,” said Kibblewhite. “This is proof of a good set up of electronically-controlled direct-injection engines and a quality installation.”

According to Power Equipment, the engines produced no visible smoke during start-up or manoeuvring and very little during heavy load acceleration tests, which is in line with Yanmar’s aim to produce engines that surpass global emission standards.

Shoreline Marine built the Ada Clara to be a versatile vessel and believe her design could have applications in other industries, including oil and gas, charters or marine research. Her initial work load will be line fishing for species-specific catches in deeper waters along the Western Australia coast, clocking up around 1,500 hours a year on her engines, depending on weather and market conditions.

Ada Clara’s new owner said that during her trials she showed excellent sea-keeping abilities and was also very quiet, which is good because noise equals fatigue in any working environment, adding that Power Equipment made sure everything would run properly from installation through to the sea trial.

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