51' 9" (15.77m)

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HH Catamarans OC50
2021 51' 9" HH CATAMARANS Catamaran United States
Price on Application

The 2021 51' 9" HH CATAMARANS Cruiser Catamaran HH Catamarans OC50 is a sail boat for sale located in United States.

Rocknak's Yacht Sales is a Worldwide HH Agent

Deliveries to North, Central, and South America, Europe, Asia, and the Pacific

Contact the yacht broker to receive more information or schedule a showing of this 2021 51' 9" HH CATAMARANS Catamaran Cruiser HH Catamarans OC50 yacht for sale in USA today!

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LENGTH 51' 9" (15.77m)
ASKING PRICE Price on Application
BUILT 2021
BEAM 24' 5" (7.44m)
DRAFT 5' 2" (1.56m)
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Unique Characteristics

What makes the OC50 unique is its ability to sail a percentage of the wind speed much higher than other cruising cats. The OC50 is a true performance cruising catamaran all the while offering top level construction and accomodations.

A typical 50' cruising cat may average around 7 knots or so on a circumnavigation. Expect higher numbers with the OC50. Perhaps you can be the first to give us that data. As of now the preliminary data is excellent. See the photos of the B&G displays.

What makes the boat different? Well, first its the design prowess of Morelli and Melvin and the exacting standards of the engineers and staff of HH Catamarans. The HH brand accommodates the small niche of people who demand performance, quality, and high-end accommodations.

Equally important is the experience of Rocknak's to guide you through the build. We have visited with, and know, the key personnel at the factory on a first name basis. Rocknak's has the capability to train you in your boat and provide service and support while you own your new OC50. Ask for recommendations.

On your first sea trial you will find the boat turns quickly, is stable, points much higher than what you have been accustomed to on charter cats, and can be maneuvered easily in port.

The boat is predictable, has excellent bridge deck clearance, and exudes quality. Inquire how to see the boat yourself. You will see why visitors at the boat shows and those that have been aboard say the HH Catamaran is their favorite.

Please contact Scott Rocknak scott@rocknaks.com


Three and four cabin models available. Your choice of interior finishes and fabrics including actual wood veneer and solid trim or artificial wood with stunning appearance. Flooring is an LVT of Amtico brand and is also highly customizable.

Each boat is designed for long-term and long distance live aboard capability. Even for a performance catamaran there is more than ample storage.

Aft cabins feature queen size berths at normal bed heights. Each cabin is well lit and features a picture window aft opening up the interior. In the 3-cabin Master's version there are full height cabinets inboard including shelves, drawers and hanging lockers. Outboard are half-height chests or cabinets.

The guest hull aft features a full height armor outboard and additional locker space inboard. The forward cabin also has its own cabinets and storage. Under all the berths are cavernous storage possibilities.

In the salon there are two separates settees allowing for a more apartment like feel vs your typical u-shaped catamaran table/settee combination. Headroom is carried all the way forward and can accommodate 6'7" or more.

In the salon is also the navigation station with full navigation instrumentation and ship's controls.

See our video on the HH50's interior. It is identical in layout. The finish and fabric choices are yours.


The galley is u-shaped with a three or four burner gas stove and oven. Electrical option is available as an option. A microwave has its own cabinet and there is plenty of counter space for additional appliances. A double sink is standard and a sing "farm" sink is optional. Hot and Cold pressure water and there is an option for a filtered water tap.

Refrigerator and Freezer are of the drawer style and can be doubled if desired. There are several cabinets available with the option for an additional overhead cabinet. Trash is handled in its own enclosed container and it can be accessed by the cockpit entrance as well.


Electrical Equipment

Only top of the line equipment is used. The lighting is handled in multiple banks with LED warm color lamps on dimmers. These can be controlled by a variety of switches on board, some duplex, and all can be controlled and dimmed from the C-Zone system.

Fans are multiple speed and quiet, six zone air conditioning with reverse cycle heating and de-humidification is throughout the boat is optional. If you contact Rocknak's we can discuss how you can run a portion of the system on DC power at night for a client ship.

All electrical components are controlled by the onboard C-Zone system through a touch screen. The C-Zone controlled appliances all have a manual override.

Freshwater pumps are go the highest quality as are the bilge pumps. Access to all wiring, components, pumps, supply lines, etc. are all immediately available and well laid out.

A complete system video and personal electrical tutorial comes with any HH Catamaran purchased from Rocknak's.


The decks are protected by double are triple lifelines (call to discuss) stretching the entire length forward. Non-skid is built in or use the optional seadek. There is a molded in toe rap for additional protection.

All hatches are flush with drains and face forward for optimum ventilation. This includes the aft cabin hatches.

Storage is unique on the OC50 forward. Each hull has a forward locker larger enough to carry the equipment and recreational items that a long-term cruiser would desire. If you let to go with the Intregrel option (call Rocknak's, special order) you open up the generator locker for even more capacity.

The anchor locker contains an electric windlass and separate chain compartment. The bulkhead inside the locker can have a mounted Fortress anchor as a spare.

On top of the salon roof are built in rain gutters with fore and aft drains. There is enough room on the salon and bimini top to accommodate approx. 2kw of optional factory installed solar panels.



Keels and Rudders

Rudders are made by Jefa and can be removed and replaced while the boat is in the water. Spare rudders are available as an option.

The keels are unique to the OC50. They are mounted further forward and have winglets for greater upwind capability.


Each hull has its own highly insulated hotter tank. Both tanks have a hot/cold mixer valve that is immediately accessible. There are hot/cold taps in each head, shower, and transom shower. A filter water device is available.

Water maker systems are from Spectra in the 400 model as an option. A 700 model from the HH55 can be fitted for customers desiring even more capabilities. Discuss with Rocknak's the energy use and water production of each.

The water tank is located forward of the salon in the bridge deck. It has a clean-out port if needed and accessed through the anchor locker. There is a deck fill directly over the tank.With the capacity of the water maker system onboard it is possible to use only RO water if desired.

The fresh water heads have quite flush water closets and are dual use with water usage controls. Holding tanks are gravity emptied or pumped out though the deck.

Wash down is located forward and aft and the forward system can be fresh water or sea water.

A complete and thorough video of all plumbing systems aboard by Scott Rocknak included as well as in person familiarization with any HH Catamaran purchased from Rocknak's.


Seating can be varied depending on your requirements. To port is a single full length settee with table. The table can be fixed top or folding top. To starboard can be a day lounge for two or an L-Shaped settee with retracting table. On the OC50 there is a lounge are to port on top of the aft cabin aft of the salon bulkhead.

The cockpit sole comes standard in gel coat non-skid or your choice of real or artificial teak. Seadek is also an option. A variety of styles and colors are available for the flooring.

Under the traveller is a storage locker with multiple compartments. If you are using the gas option onboard for cooking the tanks are located under the starboard settee.

Fishrod holders are available as well as fish rod storage. with Rocknak's for best placement options based on experience.


Engines are standard as the Yanmar 3-cyl 40 HP diesels. In addition there is the option for Betamarine 38 HP 4-cyl diesels. The Betamarines can handle the 185 amp 24 volt alternators or the optional Integrel systems. Both systems utilize sail drives that can have their oil changed while the boat is in the water.

Many people have asked about electrical drives. Please contact Rocknak's and ask for Scott to open a discussion on this topic.

A 6kw Northern Lights generator is available as an option. It is mounted forward of the salon in its own locker.

Steering is the Jefa system. All components are accessible. Dual autopilots are available (for redundant systems) as an option.

A bow thruster, (1) mounted in the starboard hull, is also an option.

With each Rocknak supplied HH Catamaran a full video is supplied on how to operate and diagnose the mechanical systems specific to your boat.


The standard offering is from B&G with a very large set of options available including full sailing analysis, radar, forward looking sonar, autopilots and more.

With your new OC50 you receive complete training from Rocknak's as well as a custom video showing you operation of all your equipment including the nuances of the electronic systems on board.

Rocknak's has experience in electronic navigation instruction since 1985 having operated specialized electronic navigation training boats in the past.


Your choice of a multiple sailmakers. This includes standard and performance configurations. The mainsail can be square-top or pinhead, forward sails available are Spinnaker, Asymmetrical Spinnaker, Reacher, Solent, and Staysail. Its typical to have a three sail combination on three roller furlers.

Contact Rocknak's for real-world numbers of a variety of sail combinations.


About Rocknak's

Rocknaks' Yacht Sales has over 65 years operating full service boat yards. This includes hands on mechanical, electrical, electronic, composite, and wood working capabilities. We specialize in powerboats and sailboats for extended voyaging. Our catamaran experience goes back to 1989. We handle import and export of boats to or from where you desire.

Our background includes seasonal storage where we assemble and disassemble dozens of boats a year, thousands of pleasurable interactions and transactions, maintaining charter fleets, and sale of new and used boats since the invention of composite construction. Many of the manufacturers boats we have sold over the years have incorporated our design and engineering suggestions into their more advanced models.

We maintain and own a full service facility with infrastructure and personnel. Our indoor heated facilities can accommodate up to 50' monohull and 40' Catamarans. This includes available moorings in two of the most idyllic harbors anywhere. We have established relationships with local boatyards that can haul catamarans up to 38' wide.

Our connections and affiliations expand worldwide to accommodate our traveling clientele.

Many of our customer base have been with us for decades.

Rocknak's offers unique capabilities and knowledge for project management of your new build, training you in its use, and maintaining a lasting relationship years into your ownership.


Hull & Construction

The OC50 is composite core constructed of resin infused e-glass with carbon fiber ring frames, supports, and other critical components. The hull is from the same mold as the HH50 and features performance keels with winglets.

There are standard gel coat colors available or optional polyurethane paint. The decks are non-skid and there is the option for Flexiteek or Seadek.

Please inquire for the complete Spec Sheet for the details on the hull construction and all the other aspects of the OC50.

Rocknak's has unique in-house ability to mock-up the exterior (and interior) in your choices of colors during your decision making process.


Listing Marketed by

W. Scott Rocknak
Rocknak's Yacht Sales, Inc
10 Camden St, PO Box 339 Rockport, Maine, 04856 USA

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W. Scott Rocknak
Rocknak's Yacht Sales, Inc