Twin Disc transmission for excursion vessel
For its new 600-passenger 39m x 9m excursion vessel, Enhydra, San Francisco-based Red and White Fleet chose a BAE Systems HybriDrive.
Builders faced the challenge of integrating both the craft's Cummins 410 horsepower engines and the advanced 80-kWh battery-powered propulsion solution into a traditional marine power train.
Twin Disc distributor Mill Log Marine provided the solution with QuickShift® MGX-5114SC reduction gears and an EC300 Power Commander electronic propulsion control that meets Subchapter K requirements. The combination delivered the efficiency needed to complement the hybrid vessel's sustainable fuel consumption, lessened impact on marine life and quiet operation.
"Enhydra is just another example of how Mill Log Marine and Twin Disc strive to solve our customers' needs in marine drivetrain applications," said Bob Shamek, Mill Log Marine key account executive. "On Enhydra, the gears have remote electric motor driven oil pumps. This allows the gear to stay engaged when the motors are operating at low speed and through zero shaft speed when changing rotation from forward to reverse."
The QuickShift® MGX-5114SC offers a smooth, steep power curve with fast shifting, precise slow speed control and quiet operation. The 3:1 gear features an SAE J617 number 1 vertical offset, aluminum housing and minimal external plumbing. It boasts an electric GP-valve with manual override.
The Twin Disc EC300 Power Commander electronic propulsion control provides drive motor speed and rotational control, along with fault monitoring.
By Jake Frith
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