Offering five hours of electric displacement cruising, the 58 Fly hits the water in autumn.

When it comes to leaving a low carbon footprint, hybrid power is one of the most realistic options open to boating at the moment. Slovenia-based Greenline have been in tune with this concept for some time and, due to the success of their smaller cruisers, have now met demand for a bigger hybrid with their new 58 Fly. Due for official launch later in 2022, this 30-tonne luxury cruiser is not shy in coming forward when it comes to renewable energy.

An array of 11 solar panels arranged across the flybridge and hardtop structures produce 3.6kW of power and allow the boat’s domestic services to run without a diesel generator. This alone is no mean feat, as few boats can drop the hook in a remote cove and survive pretty much indefinitely. Like all high-quality monocrystalline solar panels, the Greenline’s renewable energy source will work in low sunlight, so Mediterranean climates are not a prerequisite, though I doubt that long periods of overnight electric heating are realistic. The capacity of the service battery bank is 16kWh, which is quite substantial, so overnight air conditioning is a reality, but you would likely want a decent dose of sunlight the next day to top things up.

Greenline’s new design team have given this boat a refreshed contemporary exterior.

A newly developed hybrid system with a pair of 25kW (33hp) motors including adaptable hydraulic clutches, otherwise known as ‘Next Generation H-Drives’, is connected inline to shaft drive engines. At the moment, standard H-Drive engine choices include 610hp and 715hp Cummins diesels, and a non-hybrid twin 1000hp Caterpillar option is available, with a top speed of 30 knots. The Cummins 715s with hybrid drives will push the 58 Fly to a top speed of 26 knots, and cruise at 20 knots. Of course, the big question is: how much range does this 58ft boat have without burning fossil fuel? The official Greenline answer is that you can cruise at 6 knots for a range of 30nm on a fully charged battery bank, which, all things considered, is pretty good. The 16kWh lithium battery bank has the ability to be recharged from the engines when they are run. So you could do a fair few sea miles at displacement speed – in a restricted waterway, for example – and then run the main engines in the open sea, reverting to a lower ‘green speed’ as and when. If you are in no hurry to get where you are going, using this ‘leapfrog’ cruising concept could mean quite a bit of silent sea time. 

Weight saving is a key part of the 58 Fly’s engineering. Greenline state that every tonne of weight sacrifices 1 knot of speed. To this end, carbon fibre is used throughout the boat – namely in the hardtop and superstructure. To further keep weight down, a new lightweight core in the sandwich construction has been introduced with the same goal in mind.

The 58 Fly marks the beginning of a new partnership between Greenline Yachts, Marco Casali of Too-Design and MICAD engineering. Casali has created a fresh exterior look for this new model with clean lines and tight proportions. The single-level main deck with aft galley ensures the saloon and cockpit combine to create a large living and entertaining area. With a pair of extra director’s chairs, six can dine around the cockpit table, and with the table extended and another set of chairs, dinner parties can stretch to eight. When not called upon for dining duties, the hi-lo table and a set of infill cushions convert this area into a spacious day bed with waterside views.

The forward section of the vessel enjoys more sunbathing space on the coachroof, and two aft-facing seats are arranged opposite a bench seat to create an intimate living space. This design is focused on providing a private on-deck area if moored stern-to. The flybridge comes as standard, with a radar mast mounted at its aft end, and a substantial carbon fibre T-top offering excellent protection on the flybridge. A well-equipped wet bar, spacious dinette and an open space for free-standing furniture create a flybridge that excels as a social area, day or night. 

Internally, a bright and spacious main deck, with Greenline’s familiar aft galley layout, gives way to a voluminous accommodation deck bristling with innovation. The standard arrangement comprises three cabins, two bathrooms and walk-in wardrobes for the master and VIP en suite cabins. The master cabin stretches across the boat’s full beam amidships and boasts 1.96m of headroom throughout. The double VIP cabin sits in the bow, and a generous twin guest cabin lies on the starboard side. It is possible to sacrifice the walk-in wardrobe in the VIP cabin to make space for a third bathroom, which becomes a day heads, but the real game-changer is the option to replace the twin guest cabin with a dedicated study. In a world where many now work out of the office, this fully fitted-out office space with built-in monitors, HDMI and USB points, printer storage and a stylish functional office chair wants for nothing in this department. If a sofa that converts into a single berth is built into this arrangement, it offers occasional sleeping space if needed. There is also the option of having a crew cabin with a single berth or bunk beds. However, on owner-run boats, this area with 1.8m headroom can be used as a utility space or a workshop, and the added storage space is a big advantage for those who wish to stay on board for extended periods. At the stern, an extended hydraulic platform with a 500kg lift capacity provides either that perfect water-level bathing platform or the ability to easily recover your tender. 


  • LOA: 18.20m (60ft 0in)
  • Beam: 5.12m (16ft 10in)  
  • Draught: 1.0m (3ft 03in)
  • Fuel capacity: 2500L (550 gal)
  • Optional extended fuel capacity: 3500L (770 gal)
  • Water capacity: 600L (132 gal) 
  • Engines: 2 x 600hp or 2 x 715hp Cummins, both with twin 25kW hybrid drives or  twin 1000hp Cummins without hybrids 
  • Performance: 30 knots with twin 1000hp Cummins or 26 knots with twin 715hp Cummins/hybrids
  • Performance cruising: 20–25 knots
  • Range pure electric: 30nm at 6 knots


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