Contents of Report

Sirena 64 overhead

Built in Turkey, the Sirena 64 combines Italian styling, a seaworthy hull, and big boat features in a mid-sized package.

Sirena 64 open ocean

The Sirena 64 is built to CE Class A standards, which means it’s a vessel that is built to navigate the open ocean in Force 8 wind seas higher that 4 meters (13.1-feet).

Sirena 64 running

The Sirena 64 came with a Seakeeper 16 gyro-stabilizer that made a significant difference, especially noticeable when the boat is at rest.


The Sirena 64 was designed, engineered, and built for an owner/operator. She is a CE Class A cruiser, capable of making bluewater passages. Her 19’4” (5.89 m) beam, 101,412 lbs. (46,000 kg), fully laden displacement, her low CG, and her Seakeeper stabilizing gyro, help provide the most comfortable ride possible offshore. With three en-suite staterooms, a separate day head, a huge flybridge and entertaining venues all over the boat, the Sirena 64 can handle a crowd for cocktails or dining al fresco. For more formal dining inside, the galley and dining area are on the main deck, conveniently side-by-side. The well-placed large windows and wraparound windshield makes the Sirena 64’s interior a bright and airy space.

Sirena 64 layout

This overhead view of the large flybridge shows the wraparound seating on the starboard side with table.

Sirena 64 main deck layout

The main deck layout depicts the fore and aft social areas, the main salon, the opposing galley and dining area and the lower helm on the port side.

Sirena 64 three stateroom layout

The three-stateroom lower deck layout.

Major Features

  • Extended Swim Platform. The teak swim platform can accommodate most tenders and hydraulically lowers with built-in, automatically deployed stairs.
  • Extended Flybridge. The flybridge deck extends over the aft deck and side decks. The Sirena 64 flybridge is designed for entertaining and has a portside helm.
  • Double Wide Cockpit to Salon Sliding Door. The aft salon bulkhead glass doors neatly slide to starboard to create an easy transition from the cockpit to the salon.
  • Flexible Aft Deck Tables. The aft deck has two tables forward of the transom bench seating. They can convert to form a large table with deck chairs, providing the seating in front of the table.
  • Forward Deck Social Area. The forward-facing, C-shaped seating surround a table. The opposing forward deck sun pads convert to chaise lounge seating.
  • Upper and Lower Helm. With the dual helms, the operator can choose the wider version of the upper helm or the protected environment of the lower helm.

Her Designers

Sirena 64 designer

German Frers is one of the most famous yacht designers in the world and his boats have won every major sailboat racing title in the world.

The hull, exterior styling, and concept of the Sirena 64 were all conceived by Frers Naval Architecture & Engineering. Led by German Frers, this design team, which is located in Buenos Aires, is one of the premier yacht designers in the world. His father started designing yachts in 1925, and son German took over the firm in 1970 after training under Olin and Rod Stephens in their New York office. He went on to design some of the most successful racing and cruising sailboats in the world, and has many megayachts to his name. Over the years under his guidance, his firm has created over 1,300 designs, most of which have been custom projects.

Frers’ analytical thinking and his knowledge of what makes a good sea boat, and a fast one, can be seen all over the Sirena 64. He is generally regarded as having one of the finest eyes for boat lines in the business.

Sirena 64 designer

Tommaso Spadolini at his design office in Florence. Like Frers, his father was a naval architect and designed the first motoryacht for Cantieri di Pisa.

Design Studio Spadolini was responsible for the interior décor of the Sirena 64. He has worked on over 200 yachts in his 30-year career, including Fortuna, the early fast motoryacht commissioned by the king of Spain many years ago.

Features Inspection

Swim Platform

Sirena 64 aft platform

The aft swim platform on the Sirena 64 lowers hydraulically into the water to launch a tender or create a place for swimmers to rest.

The full-beam swim platform extends out 4’11” (1.50 m) from the transom and provides an ideal boarding area when secured to a floating dock. Stairs on both the port and starboard side lead up to the aft deck. This makes boarding from either side convenient.

There was no evidence of a re-boarding ladder. The America Boat and Yacht Council (ABYC) rules call for all boats to have a re-boarding ladder that extends 22’’ (.56 m) into the water and is retrievable from someone who is in the water.

Sirena 64 stairs

Stairs lead up from the swim platform on both sides of the Sirena 64’s transom. Note the welcome grab rail on the outboard side of the stairs.

Aft Deck

Sirena 64 line handling

On both the port and starboard corners of the aft deck are hefty line handling and safety features.

At both quarters of the aft deck, built into the bulwarks are roller fairleads (yellow arrow), mooring bollards (green arrow) and a power winch (red arrows) for line handling. At the top of each stairway is a locking safety gate (purple arrow).

Sirena 64 winch

Forward of the winch and bollards is a deck mounted scupper, there to drain water from the deck during heavy rains or washdowns.

Sirena 64 bench seat

The sofa-style aft bench seating is mounted in the transom.

Sirena 64 tables

The folding tables allow easy access to the aft seating when folded and provide a large surface for al fresco dining when fully deployed.

Deck chairs provide a flexible feature allowing more people to join the conversation at the table or arrange separately on the aft deck wherever desired.

Sirena 64 extended fly bridge

The extended flybridge provides overhead protection from the sun and some elements on the aft deck.

Sirena 64 doors

On both sides of the aft deck are walkthrough doors for boarding from a raised fixed dock.

Sirena 64 side decks

The side decks on both the port and starboard side are 21” (.53 m) wide and the bulwarks and teak rail are 32” (.81 m) high. There is also a door covering the fuel fill port. Note the flybridge deck extends over the side decks.

Moving about on a boat while underway is often problematic. The Sirena 64’s wide, protected side decks add a measure of safety and comfort when attempting to move forward or back. They also give the boat the feel of a megayacht because of the high bulwarks.


Sirena 64 bow

With an 8” (.20 m) high toe rail, and brawny stainless-steel safety rails 25” (.64 m) above the deck, provide a secure feel on the bow.

Like the aft deck, the Sirena 64 has heavy-duty mooring line handling hardware. There are stainless-steel fairleads (yellow arrows) built into the toe rail and power winches nearby. Stainless-steel bollards secure even the heaviest dock lines. The foredeck is otherwise clear since the ground tackle is fed through the bow and the anchor is secure on a bow roller. The anchor is deployed and retrieved remotely.

Sirena 64 anchor locker

Under the foredeck is the anchor locker, the all-chain rode is automatically stowed under the hatch on the floor of the locker.

The aft bulkhead of the anchor locker is watertight, providing a crash box that adds a measure of safety to the boat.

Sirena 64 sun lounge

The double wide sun lounge has two separate back rests that adjust into three positions.

Sirena 64 storage

There is storage under the sun lounge.

Sirena 64 cup holders

Alongside of the sun lounge are cup holders, a place for a cell phone, additional storage and a pop-up night light.

Sirena Marine seems to understand that storage space is a premium on a boat of this size and its long-range cruising mission.

Sirena 64 table

Abaft of the sun lounge is wrap around seating surrounding a solid wood table on high-low pedestals. On both sides is additional storage, cup holders, pop-up lighting and a secure space for a cell-phone.

Sirena Marine shows its understanding of how boaters actually use their boats. The forward deck is designed to provide a social gathering space that provides comfortable seating for a good-size crowd.


Sirena 64 fly bridge

The flybridge is accessed via a port side stairway. Note the inboard grab rail. An outboard grab rail would provide additional security while underway. Note the teak treads which always should cover fiberglass steps.

The egress to the flybridge is a challenge on any flybridge boat while operating in a seaway. This often leads to injury for those who are unprepared or unable to deal with the unsteadiness. Grab rails and the use of stabilizers reduce the risk. However, always use caution accessing the flybridge while underway.

Sirena 64 flybridge deck

The flybridge deck is designed to be a highly social area with many functional amenities and a protective hardtop.

Sirena Marine has incorporated the features that most owners can appreciate on an expansive flybridge with a place to prepare food and drinks along with plenty of space for large gatherings.

Sirena 64 side table

The starboard side table is surrounded by bench seating and is an ideal location for al fresco dining.

Sirena 64 wet bar

On the port side, opposite of the dining area is a service bar with an icemaker inside the aft door below with additional storage.

Sirena 64 counter space

Additional counter space is available with the convertible top which swings out into an L-shape. This feature should only be used when the Sirena 64 is at rest since it does not lock in the open position. It does lock when closed.

Sirena 64 hardtop pedestal

The hardtop pedestal supports a shower wand and convenient grab rails (not shown).

Sirena 64 grill

Behind the starboard dining area is an outdoor galley complete with grill, sink, and refrigerator as well as storage.

Sirena 64 hard top

The hardtop can be opened to bring in the sunlight when the owners prefer.

Sirena 64 boat deck

Outside the protection of the hardtop is the boat deck, which was festooned with lounge chairs during our test.

The large boat deck serves a number of purposes: an ideal place to stow the tender when underway, a sunning area, and a welcome platform for a cocktail party under a star-studded night sky.

The Upper Helm

Sirena 64 upper helm

The upper helm station is offset to port and has a pod-style helm console. The employment of the dark-tinted acrylic between the stainless steel rail and the fiberglass bulwarks is a clever bit of design that makes the boat appear low like it has a low tophamper, while at the same time meeting ABYC standards of having a rail 24” (68 cm) off the deck.

Sirena 64 displays

The upper helm on our test boat had a single 15” (38.1 cm) multifunction display and two Caterpillar 7” (17.8 cm) displays, but there is plenty of real estate for more screens if wanted. The engine controls are mounted on the port side with the ZF joystick placed for close in maneuvering.

The upper helm is the logical choice when docking or maneuvering in tight situations. Visibility astern is a challenge from the lower helm.

Sirena 64 joystick

The ZF joystick engages the two Caterpillar engines as well as the bow and stern thrusters to make maneuvering the boat in any direction much easier and simpler. The system proved to be intuitive and relaxed.

Joystick controls have become increasingly more popular and make yachts like the Sirena 64 able to be operated by a relatively inexperienced couple in lieu of needing a crew for support.

Sirena 64 helm seat

The helm seat and companion seat are ergonomically designed with armrests and the capability to swivel. The companion seat is important for an owner/operator boat.

Sirena 64 sun pad

To the starboard of the upper helm is a comfortable sun pad. The upper helm is a natural gathering place when underway.

Sirena 64 stairway

Coming down the flybridge stairway there is a grab rail overhead that makes transitioning easier and safer.


Sirena 64 salon door

The double wide door to the salon opens to starboard, giving 5’2” (1.57 m) of easy access to the salon.

The 6” (.15 m) step up to the salon from the aft deck may present a tripping hazard for those that are not aware. Inside there is 6’8” (2.03 m) of headroom with opposing L-shaped sofa-style seating port and starboard.

Sirena 64 salon

Looking aft in this image of a sistership we see that the salon is just that – all salon for conversation and entertaining. The dining area and galley are completely separate. This is a hard thing to do even in large motoryachts.

The test boat offered soft-tones from the upholstery and oak veneers which are offset by attractive ebony accents and ebony trimmed overhead. Wide teak planking makes up the decking. Throughout the Sirena 64, the fit--inish is exceptional. Sirena Marine does all of the work in-house and they allow owners to choose from up to 20 different materials.

Sirena 64 tv storage

Behind the port seating is storage for the flat panel television that rises up at a touch of a button. On the aft end of the seating is the entertainment center.

Sirena 64 large windows

Large windows on the port and starboard side allow plenty of light inside, while providing good sightlines for passengers viewing pleasure.


Sirena 64 wine chiller

Outside the galley is a wine chiller mounted inside the galley pass-through counter.

The galley is open and placed forward of the salon on the port side. This permits the person preparing food in the galley to stay engaged with the socializing in the salon. The large window with opening section gives natural light and a view for those in the galley. Note the overhead storage and there is additional storage in the counter.

Sirena 64 galley

The double stainless-steel sink is located on the galley’s aft counter. The four-burner cooktop is mounted in the portside counter over the oven. Forward of the oven is a full-size dishwasher and full-size upper and under refrigerator and freezer.

Sirena 64 enclosed galley

On another Sirena 64 we see an enclosed galley with a glass bulkhead inboard that, with the touch of a button, can be made clear for light or opaque for privacy.

Sirena 64 glass

In this image, we see a boat that has two-way glass on both the inboard and aft galley bulkheads.

In the test boat all the counters were Corian. Sirena would be glad to enclose the galley (see image above) for owners who want to keep the galley completely separated from the salon and dining area. By putting a two way glass – opaque or clear – European owners can keep staff separated from the guests for privacy. When just the family is aboard, touch the button for clear. Americans will probably select the open arrangement as seen on our test boat.

Sirena 64 glass table

Appropriately located on the starboard side, directly across from the galley is the glass and stainless-steel dining table. Note the storage cabinets on each end of the starboard side bench seating. There are also two free-standing chairs at each end of the table.

Sirena 64 dining table

Looking aft in this image of another Sirena 64 (not our test boat), we can see that the dining table seats six comfortably. Note the bulkhead at right which encloses the galley, keeping the noise and smells inside – but with the window it is kept bright.

The dining area’s table base is fixed. However, the top has stainless-steel sliders mounted under the glass top. This permits people to easily access the starboard side bench seating and then slide the tabletop to an appropriate position. When not in use the tabletop can be slid all the way to starboard to provide more room for people to move forward and aft.

We like this arrangement, and it is relatively unusual in this size yacht. The dining table can be used for both formal and informal dining, and is separate from the salon. It is an excellent use of space, and adaptable to different needs.

Sirena 64 pantograph door

There is a pantograph door – which ensures a watertight seal -- on the starboard side leading to the side deck.

The advantage of a pantograph door is that they are usually watertight and they swing outward and to the side lying nearly flush to the side when fully open. This lets the door be wider than the space available to open if it were on conventional hinges. As an example, the Sirena 64 has 21” (.53 m) wide side decks and the door width is approximately 36” (.91 m), making it too large to swing open in a traditional manner.

Sirena 64 cabinet

Behind the dining table is an oak veneer and leather topped storage cabinet. Note the large radius of the rounded corners to mitigate bruising in a seaway, and a raised edge on the counter to keep incidentals from sliding off.

Lower Helm

Sirena 64 lower helm

The lower helm station is laid out similar to the upper helm, with controls to the left. Sirena will be happy to flip-flop them with the accessary toggles to the right if desired by the owner. We like the versatility of this design, which is unusual.

Below the 17” multifunction displays are twin 7” Caterpillar displays for monitoring the engine functions. Below the center-mounted compass are the ignitions, engine start, stop and emergency stops. To the right of the leather wrapped steering wheel is another feature missing on the upper helm, the SeaKeeper gyro-stabilizer controls and the auto-trim control.

In addition to the ZF joystick, the lower helm also has a bow thruster joystick added to the armrest on the port side. On the far right of the lower helm is the system controls switch panel.

Sirena 64 port window

The helm’s port side window opens to allow fresh air into the space.

Sirena 64 companionway

Sweeping forward views are permitted by the round forward windows. There is a bench-style companion seat alongside the helm.

The companion helm seating allows people to join the operator while underway. There is a convenient, flip-up table mounted on the starboard side bulwark, which can be used as a navigation table, work station, or place for the off-watch captain to have lunch.

Sirena 64 power panel

Behind the helm is the Sirena 64’s main power panel with the AC on top and the DC on the lower panel. Having the panel where the operator can easily access it rarely occurs. In this case, it is well done.

The bulkhead and upper storage behind the helm seat makes it nearly impossible for rear views. Rarely does a boat of this size have great views to the rear. In this case seeing what is coming up from behind or backing into a slip is not really possible. The operator would need to stand and look around the bulkhead and most likely be out of reach of the joystick. That’s why the upper helm has such great utility. Remote controls can also be added on the aft deck.

Sirena 64

The bench seat is double-wide, and the bolster can fold up to become a leaning post or for stand-up operation, as shown here. This is great for longer distance journeys, allowing the operator to change positions. However, if the bolster was split into two bolsters there would be an opportunity for the operator and an observer to have two different positions at the same time.

Sirena 64 helm companion seating

Alongside the helm’s companion seating to starboard is the stairway to the lower deck and the stateroom accommodations.

Forward VIP Stateroom

Sirena 64 vip stateroom

The forward VIP stateroom is traditionally laid out with a centerline island berth.

The forward berth measures 6’6” (1.98 m) long and 5’4” (1.63 m) across. The unusual feature is that it is only 17” (.43 m) above the deck, making getting onto the bed very easy – perhaps the most convenient we have ever seen in a bow cabin. Most forward, centerline island berths are much higher, requiring steps or a hop to get onto the bed.

Sirena 64 window

The large windows allow an abundance of natural light to enter the stateroom. Opening portlights allow fresh air to circulate when wanted, so it is the best of both worlds.

Sirena 64 bins

The Sirena 64 has a wealth of clever storage throughout and in the forward stateroom, including these two vertical storage bins along both sides of the berth. Note the Fusion stereo control unit.

Sirena 64

Mounted on the aft bulkhead is a vanity with automatic lighting when the lid is lifted, revealing the compartmentalized storage and mirror.

Sirena 64 vanity

On the port and starboard sides are hanging lockers. The lights turn on automatically when the doors are opened.

Throughout the Sirena 64 is a plethora of automatic switches that turn lights on and off, including sensors on the sconce lights which are mounted on the forward bulkhead on the port and starboard sides of the berth. Simply wave a hand under the fixture and the light will turn on or off.

Sirena 64 hanging locker

Shown is the starboard side hanging locker. There is additional storage under the centerline berth.

Forward VIP Head

Sirena 64 vip stateroom

The forward VIP stateroom has an en suite head with Corian countertops and teak flooring. The window lets natural light enter the space and it has an opening portlight for ventilation.

Sirena 64 sink

The vessel sink is mounted on top of the Corian counter. Mirrored, medicine cabinet-style storage is above and there is storage below.

Sirena 64 shower

The separate walk-in shower features a teak seat and teak shelving.

Sirena 64 shower head

Along with a hand-held shower wand, there is a rain shower head fixture mounted above.

Day Head

Sirena 64 day head

Just abaft of the VIP stateroom, on the port side across from the stairway, is a convenient day head comprised of a wall mounted mirror, vessel sink mounted on a Corian countertop, above storage, and a toilet. Note the teak decking.

There is a dedicated day head, something unusual belowdecks in virtually any size boat. This is a terrific amenity and is perfect for guests who are aboard just for the day. By locating it below, it is “out of the way”, but still ensures the privacy of the three staterooms.

Each stateroom has its own en suit head with a separate walk-in shower. It provides needed comfort for owners and their guests without having to enter a private stateroom.

Guest Stateroom

Sirena 64 twin beds

Two windows let natural light spill into the space with the aft most window having an opening portlight to let in fresh air when desired.

Sirena 64 hanging locker

There is a hanging locker at the entrance to the en suite head.

Sirena 64 night stand

In between the twin bed is a nightstand with a soft-closing drawer for storage.

Sirena 64 en suite head

The en suite head has a walk-in shower with a teak seat, a wall mounted shower wand, and a rain shower head mounted to the overhead.

The styling and quality fixtures in the Sirena 64 is consistent throughout the entire yacht, making all guests feel important to the owners.

Master Stateroom

Sirena 64 master stateroom

Moving aft from the guest stateroom is the full-beam master stateroom. It is two steps down and affords 6’5” (1.95 m) of headroom. The large hull-side windows, port and starboard, lend to a feeling of openness.

Slightly to the port of center is the master berth, measuring 6’4” (1.93 m) long and 5’1” (1.55 m) across, and it is a comfortable 21” (.53 m) above the deck.

Sirena 64 master stateroom

On the starboard side, there are two hanging lockers forward, a large hull-side window with seating, and a table that can be used for private dining or as a work desk. It opens to reveal an automatically lit vanity.

Sirena 64 hull side window

On the port side is another large hull-side window mounted over a comfortable chaise lounge.

Both the port and starboard windows offer excellent line-of-sight views that keep the horizon always within view. However, neither have opening portlights.

Sirena 64 port lounge

There is storage under the port lounge and starboard seating. There is additional storage in the nightstands on both sides of the master berth.

Master Head

Sirena 64 sinks

The entry to the master en suite head is through a door on the starboard side of the master berth. There are his and her vessel sinks with a large mirror mounted above and storage under the Corian countertops.

Natural light comes in through the hull-side windows on the port and starboard side of the head. Both have opening portlights.

Sirena 64 head storage

There is vertical storage under the starboard side window mounted on the countertop.

Sirena 64 bidet

To the port of the his-and-her sinks is a toilet and bidet. All the way to port is a walk-in shower with a teak seat, teak shelving, a shower wand, and a rain shower head mounted to the overhead.

Crew’s Quarters

Sirena 64 crew space

The crew space is entered through a watertight pantographic door in the transom.

Sirena 64 crew quarters

The crew’s quarters are pretty Spartan with one narrow berth mounted on the port side above the washer/dryer. The reason for that is because this boat is really designed to be an owner/operator vessel – not one with a captain. However, we think it is a good idea to have a young lad aboard for washdown and other chores, and for them this cabin is perfect.

Sirena 64 berth

The second narrow berth is on the starboard side behind the head locker. Some owners might want a nanny aboard, or perhaps a young, eager cook. These crew quarters, although minimal, offer added utility. And, of course, grandchildren would love hanging out here.

Sirena 64 head

The crew’s head is basic and includes a shower in a single head locker. Note the floor drain.

Sirena 64 machinery space

The machinery space is located directly forward of the crew’s quarters through another watertight door.

Machinery Space

Sirena 64 access

The machinery space can also be accessed through a hatch in the aft deck.

Sirena 64 engines

The twin 1000-horsepower Caterpillar engines are surrounded by safety rails and portions of the machinery space provide stand-up headroom.

Sirena Marine has designed the machinery space on the Sirena 64 with as much care and detail as they did for the rest of the yacht. Everything is well organized and day check items are all easily accessible.

Sirena 64 air condition

On the port side aft is the air-conditioning systems.

Sirena 64 fuel tank

Shown is the port side fuel tank and port side fuel filters.

Sirena 64 generator

On the starboard side aft are the two gensets and starboard side fuel tank and fuel filters.

Sirena 64 seakeeper

The Seakeeper 16 is mounted on the centerline between the two engines under deck plating.

Sirena 64 panels

The electrical distribution panels are mounted on the forward bulkhead.

Sirena 64 shaft logs

Dripless shaft logs keep the bilge clean and dry and are easily accessible.

The use of dripless shaft seals has become widespread over the last decade or so. More manufacturers are replacing the traditional stuffing box. There are several manufacturers of dripless shaft seals. Most of the designs use a face seal, with flexible bellows attached to the stern tube (or stuffing box collar) that presses a fixed carbon/graphite flange against a rotating stainless-steel rotor. This spins with the prop shaft, creating a seal between the rotor and flange. These have become popular because they don't require adjustment after installation, and they continue to keep sea water out even if the drivetrain is out of alignment.

Although the dripless shaft seal has become more popular, they should not be ignored. Regular inspections should be made. The bellows should be replaced every six to eight years and when adjusting, most manufacturers recommend replacing the set screws in lieu of reusing the existing one.

Options to Consider

The Sirena 64 is essentially a custom-built yacht with owner specified equipment, options, and accessories.


The base price for the Sirena 64 is around $2 million, depending on the equipment, engines, and the upgrades.

Sirena 64 over head

The Sirena 64 is a lot of boat for her size with five on-deck entertaining venues. Utility has been maximized.


Being contracted to build yachts for the Azimut-Benetti Group for more than a decade, Sirena Marine seems to have learned a lot about quality and owner expectations. The technology and craftsmanship is impressive. There is a high level of luxury and comfort with large airy accommodations and storage that rivals much larger yachts.

Her exterior styling is a bit unusual to the American eye, but we are seeing more and more powerboats with plumb bows (which permit more useable space inside), vertical, rounded pilothouse windshields (which improve visibility and save space), and high freeboard (which makes the boat more seaworthy and provides added safety when on deck). German Frers and other European designers have been taking advantage of the plumb bow concept for some years now in their megayacht projects and these concepts are now filtering down to production boats. Americans should get used to it, because it is a trend that is very much here and now.

Good Ideas Abound. We are struck by the many practical aspects of this yacht, such as the island bed in the forward stateroom that does not require a ladder to enter. We like the versatile galley design that can be opened or closed, and the adjacent dining area which is separate from the salon that is large and full of comfortable seating. Then, there is the day head below, the only one we have seen on this size boat.

This boat should be easy for an owner operator to handle, and she is certainly functional.