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Power partners on patrol

With almost a quarter of Sweden's population on its patch and thousands of islands to protect, Stockholm's Maritime Police Section has its work cut out.

For this patrol boat role, speed and maneuverability are top priorities. Described as the ideal partnership, the power behind the new 15m fast patrol boat is provided by twin D6-440 DPI sterndrives giving the Marell M15 a top speed of 45 knots. The  D6-440 DPI propulsion system is part of a fully integrated system from Volvo Penta, which includes its Electronic Vessel Control (EVC2) and Glass Cockpit System.

The D6-440 DPI full system approach sees the joystick connected to the propulsion system, transforming the driver's joystick movements into precise steering angles, gear shifts and throttle positions. The boat moves exactly according to the driver's intentions. “We were looking for a vessel that could perform well in rough waters, be comfortable and not tiring for the crew over an 8-hour shift. And be able to do that shift after shift for months on end,” says Police Inspector Johan Skogfeldt.

A 27-year career officer, Inspector Skogfeldt has been working for the Stockholm’s Maritime Police Section since 2008, and was responsible for the procurement of the Marell. “This is a very positive development, as on our other boats we have to operate multiple systems independently. To have everything in one unified system will be a great advantage. It looks fantastic and provides an excellent working environment – even the ability to swap roles between navigator and helmsman without changing seats will be useful.”

“In a vessel designed for high speed patrol duties – in any type of weather or darkness – these control systems are a significant advantage,” agrees Jonas Karnerfors, Sales Project Manager at Volvo Penta. “In fact, this entire application is an excellent demonstration of the D6-440 DPI propulsion system in a demanding marine application.”

“Unlike most of our other vessels, the Marell is built and approved for offshore operations, and has the power and performance to excel in demanding waters,” continues Inspector Skogfeldt. “The other boats we use have water jets for propulsion, but this can cause problems when trying to lift people from the water, as there is so much turbulence around the boat when trying to stay still in the water. The calmer waters created by the Volvo Penta sterndrive fitted to the Marell will make this work far easier. This is helped by the fact that the D6 sits low in the boat, meaning the rear deck can be lower, an asset when getting survivors out of the water and for our diving teams to operate from.

“My team are excited about this boat joining our fleet,” concludes Inspector Skogfeldt. “It looks great and we are confident it will perform well in demanding sea conditions.”

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